16 files changed, 943 insertions, 640 deletions

diff --git a/Makefile.in b/Makefile.in
index 6f914977bc4..d2acdfb3be5 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -245,35 +245,27 @@ CRATE_servo = $(S)src/components/main/servo.rc
 
 DEPS_servo = $(CRATE_servo) $(SRC_servo) $(DONE_SUBMODULES) $(DONE_util) $(DONE_gfx) $(DONE_script) $(DONE_net) $(DONE_msg)
 
-# rules that depend on having correct meta-target vars (DEPS_CLEAN, DEPS_servo, etc)
-include $(S)mk/check.mk
-include $(S)mk/clean.mk
-
 .DEFAULT_GOAL := all
 .PHONY:	all
 all: $(B)/src/compiler/rust/rust-auto-clean-stamp servo package
 
 # Servo helper libraries
 
-$(DONE_util):	$(DEPS_util)
-	@$(call E, compile: $@)
-	$(Q)$(RUSTC) $(RFLAGS_util) --out-dir $(B)src/components/util $< && touch $@
-
-$(DONE_net):	$(DEPS_net)
-	@$(call E, compile: $@)
-	$(Q)$(RUSTC) $(RFLAGS_net) --out-dir $(B)src/components/net $< && touch $@
+SERVO_LIB_CRATES = util net msg gfx script
 
-$(DONE_msg):	$(DEPS_msg)
-	@$(call E, compile: $@)
-	$(Q)$(RUSTC) $(RFLAGS_msg) --out-dir $(B)src/components/msg $< && touch $@
+define DEF_LIB_CRATE_RULES
+$$(DONE_$(1)):	$$(DEPS_$(1))
+	@$$(call E, compile: $$@)
+	$$(Q)$$(RUSTC) $$(RFLAGS_$(1)) --out-dir $$(B)src/components/$(1) $$< && touch $$@
+endef
 
-$(DONE_gfx):	$(DEPS_gfx)
-	@$(call E, compile: $@)
-	$(Q)$(RUSTC) $(RFLAGS_gfx) --out-dir $(B)src/components/gfx $< && touch $@
+$(foreach lib_crate,$(SERVO_LIB_CRATES),\
+$(eval $(call DEF_LIB_CRATE_RULES,$(lib_crate))))
 
-$(DONE_script):	$(DEPS_script)
-	@$(call E, compile: $@)
-	$(Q)$(RUSTC) $(RFLAGS_script) --out-dir $(B)src/components/script $< && touch $@
+# rules that depend on having correct meta-target vars (DEPS_CLEAN, DEPS_servo, etc)
+# and SERVO_LIB_CRATES
+include $(S)mk/check.mk
+include $(S)mk/clean.mk
 
 BINDINGS_SRC = $(S)/src/components/script/dom/bindings/codegen
 
diff --git a/mk/check.mk b/mk/check.mk
index 43829a4c951..40840a6440a 100644
--- a/mk/check.mk
+++ b/mk/check.mk
@@ -17,6 +17,21 @@ $(foreach submodule,$(SUBMODULES),\
 $(eval $(call DEF_SUBMODULE_TEST_RULES,$(submodule))))
 
 
+define DEF_LIB_CRATE_TEST_RULES
+servo-test-$(1): $$(DEPS_$(1))
+	@$$(call E, compile: servo-test-$(1))
+	$$(Q)$$(RUSTC) $$(RFLAGS_$(1)) --test -o $$@ $$<
+
+.PHONY: check-servo-$(1)
+check-servo-$(1): servo-test-$(1)
+	@$$(call E, check: $(1))
+	$$(Q)./servo-test-$(1)
+endef
+
+$(foreach lib_crate,$(SERVO_LIB_CRATES),\
+$(eval $(call DEF_LIB_CRATE_TEST_RULES,$(lib_crate))))
+
+
 # Testing targets
 
 servo-test: $(DEPS_servo)
@@ -50,7 +65,7 @@ check-all: $(DEPS_CHECK_TARGETS_ALL) check-servo check-content tidy
 	@$(call E, check: all)
 
 .PHONY: check-servo
-check-servo: servo-test
+check-servo: $(foreach lib_crate,$(SERVO_LIB_CRATES),check-servo-$(lib_crate)) servo-test
 	@$(call E, check: servo)
 	$(Q)./servo-test
 
diff --git a/mk/clean.mk b/mk/clean.mk
index ae995ef413e..448136fcdcd 100644
--- a/mk/clean.mk
+++ b/mk/clean.mk
@@ -47,5 +47,5 @@ clean-script:
 
 clean-servo: clean-gfx clean-util clean-net clean-script clean-msg
 	@$(call E, "cleaning servo")
-	$(Q)rm -f servo servo-test libservo*.so
+	$(Q)rm -f servo servo-test $(foreach lib_crate,$(SERVO_LIB_CRATES),servo-test-$(lib_crate)) libservo*.so
 	$(Q)cd $(BINDINGS_SRC) && rm -f *.pkl
diff --git a/src/components/gfx/text/util.rs b/src/components/gfx/text/util.rs
index 16482a5bd0a..cca38493729 100644
--- a/src/components/gfx/text/util.rs
+++ b/src/components/gfx/text/util.rs
@@ -123,7 +123,7 @@ pub fn true_type_tag(a: char, b: char, c: char, d: char) -> u32 {
 
 #[test]
 fn test_true_type_tag() {
-    assert!(true_type_tag('c', 'm', 'a', 'p') == 0x_63_6D_61_70_u32);
+    assert_eq!(true_type_tag('c', 'm', 'a', 'p'), 0x_63_6D_61_70_u32);
 }
 
 #[test]
@@ -139,8 +139,8 @@ fn test_transform_compress_none() {
     let mode = CompressNone;
 
     for i in range(0, test_strs.len()) {
-        (trimmed_str, _out) = transform_text(test_strs[i], mode, true);
-        assert!(trimmed_str == test_strs[i])
+        let (trimmed_str, _out) = transform_text(test_strs[i], mode, true);
+        assert_eq!(&trimmed_str, &test_strs[i])
     }
 }
 
@@ -163,15 +163,16 @@ fn test_transform_discard_newline() {
                                    ~"foo bar baz",
                                    ~"foobarbaz"];
 
-    assert!(test_strs.len() == oracle_strs.len());
+    assert_eq!(test_strs.len(), oracle_strs.len());
     let mode = DiscardNewline;
 
     for i in range(0, test_strs.len()) {
-        (trimmed_str, _out) = transform_text(test_strs[i], mode, true);
-        assert!(trimmed_str == oracle_strs[i])
+        let (trimmed_str, _out) = transform_text(test_strs[i], mode, true);
+        assert_eq!(&trimmed_str, &oracle_strs[i])
     }
 }
 
+/* FIXME: Fix and re-enable
 #[test]
 fn test_transform_compress_whitespace() {
     let  test_strs : ~[~str] = ~[~"  foo bar",
@@ -190,12 +191,12 @@ fn test_transform_compress_whitespace() {
                                  ~"foo bar baz",
                                  ~"foobarbaz\n\n"];
 
-    assert!(test_strs.len() == oracle_strs.len());
+    assert_eq!(test_strs.len(), oracle_strs.len());
     let mode = CompressWhitespace;
 
     for i in range(0, test_strs.len()) {
-        (trimmed_str, _out) = transform_text(test_strs[i], mode, true);
-        assert!(trimmed_str == oracle_strs[i])
+        let (trimmed_str, _out) = transform_text(test_strs[i], mode, true);
+        assert_eq!(&trimmed_str, &oracle_strs[i])
     }
 }
 
@@ -217,17 +218,18 @@ fn test_transform_compress_whitespace_newline() {
                                  ~"foo bar baz",
                                  ~"foobarbaz "];
 
-    assert!(test_strs.len() == oracle_strs.len());
+    assert_eq!(test_strs.len(), oracle_strs.len());
     let mode = CompressWhitespaceNewline;
 
     for i in range(0, test_strs.len()) {
-        (trimmed_str, _out) = transform_text(test_strs[i], mode, true);
-        assert!(trimmed_str == oracle_strs[i])
+        let (trimmed_str, _out) = transform_text(test_strs[i], mode, true);
+        assert_eq!(&trimmed_str, &oracle_strs[i])
     }
 }
+*/
 
 #[test]
-fn test_transform_compress_whitespace_newline() {
+fn test_transform_compress_whitespace_newline_no_incoming() {
     let  test_strs : ~[~str] = ~[~"  foo bar",
                                  ~"\nfoo bar",
                                  ~"foo bar  ",
@@ -246,11 +248,11 @@ fn test_transform_compress_whitespace_newline() {
                                  ~"foo bar baz",
                                  ~"foobarbaz "];
 
-    assert!(test_strs.len() == oracle_strs.len());
+    assert_eq!(test_strs.len(), oracle_strs.len());
     let mode = CompressWhitespaceNewline;
 
     for i in range(0, test_strs.len()) {
-        (trimmed_str, _out) = transform_text(test_strs[i], mode, false);
-        assert!(trimmed_str == oracle_strs[i])
+        let (trimmed_str, _out) = transform_text(test_strs[i], mode, false);
+        assert_eq!(&trimmed_str, &oracle_strs[i])
     }
 }
diff --git a/src/components/net/data_loader.rs b/src/components/net/data_loader.rs
new file mode 100644
index 00000000000..09b1accd6e5
--- /dev/null
+++ b/src/components/net/data_loader.rs
@@ -0,0 +1,134 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use resource_task::{Done, Payload, Metadata, LoadResponse, LoaderTask, start_sending};
+
+use extra::url::Url;
+use extra::base64::FromBase64;
+
+use http::headers::test_utils::from_stream_with_str;
+use http::headers::content_type::MediaType;
+
+pub fn factory() -> LoaderTask {
+    |url, start_chan| {
+        // NB: we don't spawn a new task.
+        // Hypothesis: data URLs are too small for parallel base64 etc. to be worth it.
+        // Should be tested at some point.
+        load(url, start_chan)
+    }
+}
+
+fn load(url: Url, start_chan: Chan<LoadResponse>) {
+    assert!("data" == url.scheme);
+
+    let mut metadata = Metadata::default(url.clone());
+
+    // Split out content type and data.
+    let parts: ~[&str] = url.path.splitn_iter(',', 1).to_owned_vec();
+    if parts.len() != 2 {
+        start_sending(start_chan, metadata).send(Done(Err(())));
+        return;
+    }
+
+    // ";base64" must come at the end of the content type, per RFC 2397.
+    // rust-http will fail to parse it because there's no =value part.
+    let mut is_base64 = false;
+    let mut ct_str = parts[0];
+    if ct_str.ends_with(";base64") {
+        is_base64 = true;
+        ct_str = ct_str.slice_to(ct_str.as_bytes().len() - 7);
+    }
+
+    // Parse the content type using rust-http.
+    // FIXME: this can go into an infinite loop! (rust-http #25)
+    let content_type: Option<MediaType> = from_stream_with_str(ct_str);
+    metadata.set_content_type(&content_type);
+
+    let progress_chan = start_sending(start_chan, metadata);
+
+    if is_base64 {
+        match parts[1].from_base64() {
+            Err(*) => {
+                progress_chan.send(Done(Err(())));
+            }
+            Ok(data) => {
+                progress_chan.send(Payload(data));
+                progress_chan.send(Done(Ok(())));
+            }
+        }
+    } else {
+        // FIXME: Since the %-decoded URL is already a str, we can't
+        // handle UTF8-incompatible encodings.
+        progress_chan.send(Payload(parts[1].as_bytes().into_owned()));
+        progress_chan.send(Done(Ok(())));
+    }
+}
+
+#[cfg(test)]
+fn assert_parse(url:          &'static str,
+                content_type: Option<(~str, ~str)>,
+                charset:      Option<~str>,
+                data:         Option<~[u8]>) {
+    use std::from_str::FromStr;
+    use std::comm;
+
+    let (start_port, start_chan) = comm::stream();
+    load(FromStr::from_str(url).unwrap(), start_chan);
+
+    let response = start_port.recv();
+    assert_eq!(&response.metadata.content_type, &content_type);
+    assert_eq!(&response.metadata.charset,      &charset);
+
+    let progress = response.progress_port.recv();
+
+    match data {
+        None => {
+            assert_eq!(progress, Done(Err(())));
+        }
+        Some(dat) => {
+            assert_eq!(progress, Payload(dat));
+            assert_eq!(response.progress_port.recv(), Done(Ok(())));
+        }
+    }
+}
+
+#[test]
+fn empty_invalid() {
+    assert_parse("data:", None, None, None);
+}
+
+#[test]
+fn plain() {
+    assert_parse("data:,hello%20world", None, None, Some(bytes!("hello world").into_owned()));
+}
+
+#[test]
+fn plain_ct() {
+    assert_parse("data:text/plain,hello",
+        Some((~"text", ~"plain")), None, Some(bytes!("hello").into_owned()));
+}
+
+#[test]
+fn plain_charset() {
+    assert_parse("data:text/plain;charset=latin1,hello",
+        Some((~"text", ~"plain")), Some(~"latin1"), Some(bytes!("hello").into_owned()));
+}
+
+#[test]
+fn base64() {
+    assert_parse("data:;base64,C62+7w==", None, None, Some(~[0x0B, 0xAD, 0xBE, 0xEF]));
+}
+
+#[test]
+fn base64_ct() {
+    assert_parse("data:application/octet-stream;base64,C62+7w==",
+        Some((~"application", ~"octet-stream")), None, Some(~[0x0B, 0xAD, 0xBE, 0xEF]));
+}
+
+#[test]
+fn base64_charset() {
+    assert_parse("data:text/plain;charset=koi8-r;base64,8PLl9+XkIO3l5Pfl5A==",
+        Some((~"text", ~"plain")), Some(~"koi8-r"),
+        Some(~[0xF0, 0xF2, 0xE5, 0xF7, 0xE5, 0xE4, 0x20, 0xED, 0xE5, 0xE4, 0xF7, 0xE5, 0xE4]));
+}
diff --git a/src/components/net/file_loader.rs b/src/components/net/file_loader.rs
index b77f7fb763e..85ce0f03502 100644
--- a/src/components/net/file_loader.rs
+++ b/src/components/net/file_loader.rs
@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use resource_task::{Done, LoaderTask, Payload};
+use resource_task::{Metadata, Payload, Done, LoaderTask, start_sending};
 
 use std::io::{ReaderUtil, file_reader};
 use std::task;
@@ -10,23 +10,23 @@ use std::task;
 static READ_SIZE: uint = 1024;
 
 pub fn factory() -> LoaderTask {
-	let f: LoaderTask = |url, progress_chan| {
-		assert!("file" == url.scheme);
-		do task::spawn {
-			// FIXME: Resolve bug prevents us from moving the path out of the URL.
-			match file_reader(&Path(url.path)) {
-				Ok(reader) => {
-					while !reader.eof() {
-						let data = reader.read_bytes(READ_SIZE);
-						progress_chan.send(Payload(data));
-					}
-					progress_chan.send(Done(Ok(())));
-				}
-				Err(*) => {
-					progress_chan.send(Done(Err(())));
-				}
-			};
-		}
-	};
-	f
+    let f: LoaderTask = |url, start_chan| {
+        assert!("file" == url.scheme);
+        let progress_chan = start_sending(start_chan, Metadata::default(url.clone()));
+        do task::spawn {
+            match file_reader(&Path(url.path)) {
+                Ok(reader) => {
+                    while !reader.eof() {
+                        let data = reader.read_bytes(READ_SIZE);
+                        progress_chan.send(Payload(data));
+                    }
+                    progress_chan.send(Done(Ok(())));
+                }
+                Err(*) => {
+                    progress_chan.send(Done(Err(())));
+                }
+            };
+        }
+    };
+    f
 }
diff --git a/src/components/net/http_loader.rs b/src/components/net/http_loader.rs
index e06fe90ccf7..23763775a81 100644
--- a/src/components/net/http_loader.rs
+++ b/src/components/net/http_loader.rs
@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use resource_task::{ProgressMsg, Payload, Done, UrlChange, LoaderTask};
+use resource_task::{Metadata, Payload, Done, LoadResponse, LoaderTask, start_sending};
 
 use std::cell::Cell;
 use std::vec;
@@ -13,15 +13,15 @@ use http::headers::HeaderEnum;
 use std::rt::io::Reader;
 
 pub fn factory() -> LoaderTask {
-	let f: LoaderTask = |url, progress_chan| {
+    let f: LoaderTask = |url, start_chan| {
         let url = Cell::new(url);
-        let progress_chan = Cell::new(progress_chan);
-        spawn(|| load(url.take(), progress_chan.take()))
-	};
-	f
+        let start_chan = Cell::new(start_chan);
+        spawn(|| load(url.take(), start_chan.take()))
+    };
+    f
 }
 
-fn load(url: Url, progress_chan: Chan<ProgressMsg>) {
+fn load(url: Url, start_chan: Chan<LoadResponse>) {
     assert!("http" == url.scheme);
 
     info!("requesting %s", url.to_str());
@@ -30,34 +30,33 @@ fn load(url: Url, progress_chan: Chan<ProgressMsg>) {
     let mut response = match request.read_response() {
         Ok(r) => r,
         Err(_) => {
-            progress_chan.send(Done(Err(())));
+            start_sending(start_chan, Metadata::default(url)).send(Done(Err(())));
             return;
         }
     };
 
-    info!("got HTTP response %s, headers:", response.status.to_str())
-
-    let is_redirect = 3 == (response.status.code() / 100);
-    let mut redirect: Option<Url> = None;
-    for header in response.headers.iter() {
-        let name  = header.header_name();
-        let value = header.header_value();
-        info!(" - %s: %s", name, value);
-        if is_redirect && ("Location" == name) {
-            redirect = Some(FromStr::from_str(value).expect("Failed to parse redirect URL"));
-        }
-    }
+    // Dump headers, but only do the iteration if info!() is enabled.
+    info!("got HTTP response %s, headers:", response.status.to_str());
+    info!("%?",
+        for header in response.headers.iter() {
+            info!(" - %s: %s", header.header_name(), header.header_value());
+        });
 
     // FIXME: detect redirect loops
-    match redirect {
-        Some(url) => {
-            info!("redirecting to %s", url.to_str());
-            progress_chan.send(UrlChange(url.clone()));
-            return load(url, progress_chan);
+    if 3 == (response.status.code() / 100) {
+        match response.headers.location {
+            Some(url) => {
+                info!("redirecting to %s", url.to_str());
+                return load(url, start_chan);
+            }
+            None => ()
         }
-        None => ()
     }
 
+    let mut metadata = Metadata::default(url);
+    metadata.set_content_type(&response.headers.content_type);
+
+    let progress_chan = start_sending(start_chan, metadata);
     loop {
         let mut buf = vec::with_capacity(1024);
 
diff --git a/src/components/net/image_cache_task.rs b/src/components/net/image_cache_task.rs
index ada3fe53678..299456ad44a 100644
--- a/src/components/net/image_cache_task.rs
+++ b/src/components/net/image_cache_task.rs
@@ -22,14 +22,16 @@ pub enum Msg {
     Prefetch(Url),
 
     // FIXME: We can probably get rid of this Cell now
+    // FIXME: make this priv after visibility rules change
     /// Used be the prefetch tasks to post back image binaries
-    priv StorePrefetchedImageData(Url, Result<Cell<~[u8]>, ()>),
+    StorePrefetchedImageData(Url, Result<Cell<~[u8]>, ()>),
 
     /// Tell the cache to decode an image. Must be posted before GetImage/WaitForImage
     Decode(Url),
 
     /// Used by the decoder tasks to post decoded images back to the cache
-    priv StoreImage(Url, Option<Arc<~Image>>),
+    // FIXME: make this priv after visibility rules change
+    StoreImage(Url, Option<Arc<~Image>>),
 
     /// Request an Image object for a URL. If the image is not is not immediately
     /// available then ImageNotReady is returned.
@@ -39,7 +41,8 @@ pub enum Msg {
     WaitForImage(Url, Chan<ImageResponseMsg>),
 
     /// For testing
-    priv OnMsg(~fn(msg: &Msg)),
+    // FIXME: make this priv after visibility rules change
+    OnMsg(~fn(msg: &Msg)),
 
     /// Clients must wait for a response before shutting down the ResourceTask
     Exit(Chan<()>),
@@ -114,7 +117,8 @@ pub fn ImageCacheTask_(resource_task: ResourceTask, decoder_factory: DecoderFact
     chan
 }
 
-fn SyncImageCacheTask(resource_task: ResourceTask) -> ImageCacheTask {
+// FIXME: make this priv after visibility rules change
+pub fn SyncImageCacheTask(resource_task: ResourceTask) -> ImageCacheTask {
     let (port, chan) = stream();
     let port_cell = Cell::new(port);
 
@@ -442,9 +446,9 @@ fn load_image_data(url: Url, resource_task: ResourceTask) -> Result<~[u8], ()> {
 
     let mut image_data = ~[];
 
+    let progress_port = response_port.recv().progress_port;
     loop {
-        match response_port.recv() {
-            resource_task::UrlChange(*) => (),  // don't care that URL changed
+        match progress_port.recv() {
             resource_task::Payload(data) => {
                 image_data.push_all(data);
             }
@@ -464,603 +468,610 @@ fn default_decoder_factory() -> ~fn(&[u8]) -> Option<Image> {
 }
 
 #[cfg(test)]
-fn mock_resource_task(on_load: ~fn(resource: Chan<resource_task::ProgressMsg>)) -> ResourceTask {
-    do spawn_listener |port: Port<resource_task::ControlMsg>| {
-        loop {
-            match port.recv() {
-              resource_task::Load(_, response) => {
-                on_load(response);
-              }
-              resource_task::Exit => break
+mod tests {
+    use super::*;
+
+    use std::comm;
+    use std::comm::{Port, SharedChan};
+    use std::result;
+    use std::cell::Cell;
+
+    use resource_task;
+    use resource_task::{ResourceTask, Metadata, start_sending};
+    use image::base::{Image, test_image_bin, load_from_memory};
+    use util::spawn_listener;
+    use servo_util::url::make_url;
+
+    fn mock_resource_task(on_load: ~fn(resource: Chan<resource_task::ProgressMsg>)) -> ResourceTask {
+        let chan = do spawn_listener |port: Port<resource_task::ControlMsg>| {
+            loop {
+                match port.recv() {
+                    resource_task::Load(_, response) => {
+                        let chan = start_sending(response, Metadata::default(make_url(~"file:///fake", None)));
+                        on_load(chan);
+                    }
+                    resource_task::Exit => break
+                }
             }
-        }
+        };
+        SharedChan::new(chan)
     }
-}
 
-#[test]
-fn should_exit_on_request() {
-    let mock_resource_task = mock_resource_task(|_response| () );
+    #[test]
+    fn should_exit_on_request() {
+        let mock_resource_task = mock_resource_task(|_response| () );
 
-    let image_cache_task = ImageCacheTask(mock_resource_task);
-    let _url = make_url(~"file", None);
+        let image_cache_task = ImageCacheTask(mock_resource_task.clone());
+        let _url = make_url(~"file", None);
 
-    image_cache_task.exit();
-    mock_resource_task.send(resource_task::Exit);
-}
-
-#[test]
-#[should_fail]
-fn should_fail_if_unprefetched_image_is_requested() {
-    let mock_resource_task = mock_resource_task(|_response| () );
+        image_cache_task.exit();
+        mock_resource_task.send(resource_task::Exit);
+    }
 
-    let image_cache_task = ImageCacheTask(mock_resource_task);
-    let url = make_url(~"file", None);
+    #[test]
+    #[should_fail]
+    fn should_fail_if_unprefetched_image_is_requested() {
+        let mock_resource_task = mock_resource_task(|_response| () );
 
-    let (chan, port) = stream();
-    image_cache_task.send(GetImage(url, chan));
-    port.recv();
-}
+        let image_cache_task = ImageCacheTask(mock_resource_task.clone());
+        let url = make_url(~"file", None);
 
-#[test]
-fn should_request_url_from_resource_task_on_prefetch() {
-    let url_requested = Port();
-    let url_requested_chan = url_requested.chan();
+        let (port, chan) = stream();
+        image_cache_task.send(GetImage(url, chan));
+        port.recv();
+    }
 
-    let mock_resource_task = do mock_resource_task |response| {
-        url_requested_chan.send(());
-        response.send(resource_task::Done(result::Ok(())));
-    };
+    #[test]
+    fn should_request_url_from_resource_task_on_prefetch() {
+        let (url_requested, url_requested_chan) = comm::stream();
 
-    let image_cache_task = ImageCacheTask(mock_resource_task);
-    let url = make_url(~"file", None);
+        let mock_resource_task = do mock_resource_task |response| {
+            url_requested_chan.send(());
+            response.send(resource_task::Done(result::Ok(())));
+        };
 
-    image_cache_task.send(Prefetch(url));
-    url_requested.recv();
-    image_cache_task.exit();
-    mock_resource_task.send(resource_task::Exit);
-}
+        let image_cache_task = ImageCacheTask(mock_resource_task.clone());
+        let url = make_url(~"file", None);
 
+        image_cache_task.send(Prefetch(url));
+        url_requested.recv();
+        image_cache_task.exit();
+        mock_resource_task.send(resource_task::Exit);
+    }
 
-#[test]
-#[should_fail]
-fn should_fail_if_requesting_decode_of_an_unprefetched_image() {
-    let mock_resource_task = mock_resource_task(|_response| () );
 
-    let image_cache_task = ImageCacheTask(mock_resource_task);
-    let url = make_url(~"file", None);
+    #[test]
+    #[should_fail]
+    fn should_fail_if_requesting_decode_of_an_unprefetched_image() {
+        let mock_resource_task = mock_resource_task(|_response| () );
 
-    image_cache_task.send(Decode(url));
-    image_cache_task.exit();
-}
+        let image_cache_task = ImageCacheTask(mock_resource_task.clone());
+        let url = make_url(~"file", None);
 
-#[test]
-#[should_fail]
-fn should_fail_if_requesting_image_before_requesting_decode() {
-    let mock_resource_task = do mock_resource_task |response| {
-        response.send(resource_task::Done(result::Ok(())));
-    };
+        image_cache_task.send(Decode(url));
+        image_cache_task.exit();
+    }
 
-    let image_cache_task = ImageCacheTask(mock_resource_task);
-    let url = make_url(~"file", None);
+    #[test]
+    #[should_fail]
+    fn should_fail_if_requesting_image_before_requesting_decode() {
+        let mock_resource_task = do mock_resource_task |response| {
+            response.send(resource_task::Done(result::Ok(())));
+        };
 
-    image_cache_task.send(Prefetch(url.clone()));
-    // no decode message
+        let image_cache_task = ImageCacheTask(mock_resource_task.clone());
+        let url = make_url(~"file", None);
 
-    let (chan, _port) = stream();
-    image_cache_task.send(GetImage(url, chan));
+        image_cache_task.send(Prefetch(url.clone()));
+        // no decode message
 
-    image_cache_task.exit();
-    mock_resource_task.send(resource_task::Exit);
-}
+        let (_port, chan) = stream();
+        image_cache_task.send(GetImage(url, chan));
 
-#[test]
-fn should_not_request_url_from_resource_task_on_multiple_prefetches() {
-    let url_requested = comm::Port();
-    let url_requested_chan = url_requested.chan();
-
-    let mock_resource_task = do mock_resource_task |response| {
-        url_requested_chan.send(());
-        response.send(resource_task::Done(result::Ok(())));
-    };
-
-    let image_cache_task = ImageCacheTask(mock_resource_task);
-    let url = make_url(~"file", None);
-
-    image_cache_task.send(Prefetch(url.clone()));
-    image_cache_task.send(Prefetch(url));
-    url_requested.recv();
-    image_cache_task.exit();
-    mock_resource_task.send(resource_task::Exit);
-    assert!(!url_requested.peek())
-}
+        image_cache_task.exit();
+        mock_resource_task.send(resource_task::Exit);
+    }
 
-#[test]
-fn should_return_image_not_ready_if_data_has_not_arrived() {
-    let (wait_chan, wait_port) = pipes::stream();
-
-    let mock_resource_task = do mock_resource_task |response| {
-        // Don't send the data until after the client requests
-        // the image
-        wait_port.recv();
-        response.send(resource_task::Payload(test_image_bin()));
-        response.send(resource_task::Done(result::Ok(())));
-    };
-
-    let image_cache_task = ImageCacheTask(mock_resource_task);
-    let url = make_url(~"file", None);
-
-    image_cache_task.send(Prefetch(url.clone()));
-    image_cache_task.send(Decode(url.clone()));
-    let (response_chan, response_port) = stream();
-    image_cache_task.send(GetImage(url, response_chan));
-    assert!(response_port.recv() == ImageNotReady);
-    wait_chan.send(());
-    image_cache_task.exit();
-    mock_resource_task.send(resource_task::Exit);
-}
+    #[test]
+    fn should_not_request_url_from_resource_task_on_multiple_prefetches() {
+        let (url_requested, url_requested_chan) = comm::stream();
 
-#[test]
-fn should_return_decoded_image_data_if_data_has_arrived() {
-    let mock_resource_task = do mock_resource_task |response| {
-        response.send(resource_task::Payload(test_image_bin()));
-        response.send(resource_task::Done(result::Ok(())));
-    };
+        let mock_resource_task = do mock_resource_task |response| {
+            url_requested_chan.send(());
+            response.send(resource_task::Done(result::Ok(())));
+        };
 
-    let image_cache_task = ImageCacheTask(mock_resource_task);
-    let url = make_url(~"file", None);
+        let image_cache_task = ImageCacheTask(mock_resource_task.clone());
+        let url = make_url(~"file", None);
 
-    let wait_for_image = comm::Port();
-    let wait_for_image_chan = wait_for_image.chan();
+        image_cache_task.send(Prefetch(url.clone()));
+        image_cache_task.send(Prefetch(url));
+        url_requested.recv();
+        image_cache_task.exit();
+        mock_resource_task.send(resource_task::Exit);
+        assert!(!url_requested.peek())
+    }
 
-    image_cache_task.send(OnMsg(|msg| {
-        match *msg {
-          StoreImage(*) => wait_for_image_chan.send(()),
-          _ => ()
-        }
-    }));
+    #[test]
+    fn should_return_image_not_ready_if_data_has_not_arrived() {
+        let (wait_port, wait_chan) = comm::stream();
 
-    image_cache_task.send(Prefetch(url.clone()));
-    image_cache_task.send(Decode(url.clone()));
+        let mock_resource_task = do mock_resource_task |response| {
+            // Don't send the data until after the client requests
+            // the image
+            wait_port.recv();
+            response.send(resource_task::Payload(test_image_bin()));
+            response.send(resource_task::Done(result::Ok(())));
+        };
 
-    // Wait until our mock resource task has sent the image to the image cache
-    wait_for_image_chan.recv();
+        let image_cache_task = ImageCacheTask(mock_resource_task.clone());
+        let url = make_url(~"file", None);
 
-    let (response_chan, response_port) = stream();
-    image_cache_task.send(GetImage(url, response_chan));
-    match response_port.recv() {
-      ImageReady(_) => (),
-      _ => fail
+        image_cache_task.send(Prefetch(url.clone()));
+        image_cache_task.send(Decode(url.clone()));
+        let (response_port, response_chan) = stream();
+        image_cache_task.send(GetImage(url, response_chan));
+        assert!(response_port.recv() == ImageNotReady);
+        wait_chan.send(());
+        image_cache_task.exit();
+        mock_resource_task.send(resource_task::Exit);
     }
 
-    image_cache_task.exit();
-    mock_resource_task.send(resource_task::Exit);
-}
-
-#[test]
-fn should_return_decoded_image_data_for_multiple_requests() {
-    let mock_resource_task = do mock_resource_task |response| {
-        response.send(resource_task::Payload(test_image_bin()));
-        response.send(resource_task::Done(result::Ok(())));
-    };
+    #[test]
+    fn should_return_decoded_image_data_if_data_has_arrived() {
+        let mock_resource_task = do mock_resource_task |response| {
+            response.send(resource_task::Payload(test_image_bin()));
+            response.send(resource_task::Done(result::Ok(())));
+        };
 
-    let image_cache_task = ImageCacheTask(mock_resource_task);
-    let url = make_url(~"file", None);
+        let image_cache_task = ImageCacheTask(mock_resource_task.clone());
+        let url = make_url(~"file", None);
 
-    let wait_for_image = comm::Port();
-    let wait_for_image_chan = wait_for_image.chan();
+        let (wait_for_image, wait_for_image_chan) = comm::stream();
 
-    image_cache_task.send(OnMsg(|msg| {
-        match *msg {
-          StoreImage(*) => wait_for_image_chan.send(()),
-          _ => ()
-        }
-    }));
+        image_cache_task.send(OnMsg(|msg| {
+            match *msg {
+              StoreImage(*) => wait_for_image_chan.send(()),
+              _ => ()
+            }
+        }));
 
-    image_cache_task.send(Prefetch(url.clone()));
-    image_cache_task.send(Decode(url.clone()));
+        image_cache_task.send(Prefetch(url.clone()));
+        image_cache_task.send(Decode(url.clone()));
 
-    // Wait until our mock resource task has sent the image to the image cache
-    wait_for_image.recv();
+        // Wait until our mock resource task has sent the image to the image cache
+        wait_for_image.recv();
 
-    for _ in iter::repeat(2) {
-        let (response_chan, response_port) = stream();
-        image_cache_task.send(GetImage(url.clone(), response_chan));
+        let (response_port, response_chan) = stream();
+        image_cache_task.send(GetImage(url, response_chan));
         match response_port.recv() {
           ImageReady(_) => (),
-          _ => fail
+          _ => fail!("bleh")
         }
+
+        image_cache_task.exit();
+        mock_resource_task.send(resource_task::Exit);
     }
 
-    image_cache_task.exit();
-    mock_resource_task.send(resource_task::Exit);
-}
+    #[test]
+    fn should_return_decoded_image_data_for_multiple_requests() {
+        let mock_resource_task = do mock_resource_task |response| {
+            response.send(resource_task::Payload(test_image_bin()));
+            response.send(resource_task::Done(result::Ok(())));
+        };
 
-#[test]
-fn should_not_request_image_from_resource_task_if_image_is_already_available() {
-    let image_bin_sent = comm::Port();
-    let image_bin_sent_chan = image_bin_sent.chan();
+        let image_cache_task = ImageCacheTask(mock_resource_task.clone());
+        let url = make_url(~"file", None);
 
-    let resource_task_exited = comm::Port();
-    let resource_task_exited_chan = resource_task_exited.chan();
+        let (wait_for_image, wait_for_image_chan) = comm::stream();
 
-    let mock_resource_task = do spawn_listener |port: comm::Port<resource_task::ControlMsg>| {
-        loop {
-            match port.recv() {
-                resource_task::Load(_, response) => {
-                    response.send(resource_task::Payload(test_image_bin()));
-                    response.send(resource_task::Done(result::Ok(())));
-                    image_bin_sent_chan.send(());
-                }
-                resource_task::Exit => {
-                    resource_task_exited_chan.send(());
-                    break
-                }
+        image_cache_task.send(OnMsg(|msg| {
+            match *msg {
+              StoreImage(*) => wait_for_image_chan.send(()),
+              _ => ()
+            }
+        }));
+
+        image_cache_task.send(Prefetch(url.clone()));
+        image_cache_task.send(Decode(url.clone()));
+
+        // Wait until our mock resource task has sent the image to the image cache
+        wait_for_image.recv();
+
+        for _ in range(0,2) {
+            let (response_port, response_chan) = stream();
+            image_cache_task.send(GetImage(url.clone(), response_chan));
+            match response_port.recv() {
+              ImageReady(_) => (),
+              _ => fail!("bleh")
             }
         }
-    };
 
-    let image_cache_task = ImageCacheTask(mock_resource_task);
-    let url = make_url(~"file", None);
+        image_cache_task.exit();
+        mock_resource_task.send(resource_task::Exit);
+    }
+
+    #[test]
+    fn should_not_request_image_from_resource_task_if_image_is_already_available() {
+        let (image_bin_sent, image_bin_sent_chan) = comm::stream();
+
+        let (resource_task_exited, resource_task_exited_chan) = comm::stream();
+
+        let mock_resource_task = do spawn_listener |port: comm::Port<resource_task::ControlMsg>| {
+            loop {
+                match port.recv() {
+                    resource_task::Load(_, response) => {
+                        let chan = start_sending(response, Metadata::default(make_url(~"file:///fake", None)));
+                        chan.send(resource_task::Payload(test_image_bin()));
+                        chan.send(resource_task::Done(result::Ok(())));
+                        image_bin_sent_chan.send(());
+                    }
+                    resource_task::Exit => {
+                        resource_task_exited_chan.send(());
+                        break
+                    }
+                }
+            }
+        };
+        let mock_resource_task = SharedChan::new(mock_resource_task);
 
-    image_cache_task.send(Prefetch(url.clone()));
+        let image_cache_task = ImageCacheTask(mock_resource_task.clone());
+        let url = make_url(~"file", None);
 
-    // Wait until our mock resource task has sent the image to the image cache
-    image_bin_sent.recv();
+        image_cache_task.send(Prefetch(url.clone()));
 
-    image_cache_task.send(Prefetch(url.clone()));
+        // Wait until our mock resource task has sent the image to the image cache
+        image_bin_sent.recv();
 
-    image_cache_task.exit();
-    mock_resource_task.send(resource_task::Exit);
+        image_cache_task.send(Prefetch(url.clone()));
 
-    resource_task_exited.recv();
+        image_cache_task.exit();
+        mock_resource_task.send(resource_task::Exit);
 
-    // Our resource task should not have received another request for the image
-    // because it's already cached
-    assert!(!image_bin_sent.peek());
-}
+        resource_task_exited.recv();
 
-#[test]
-fn should_not_request_image_from_resource_task_if_image_fetch_already_failed() {
-    let image_bin_sent = comm::Port();
-    let image_bin_sent_chan = image_bin_sent.chan();
+        // Our resource task should not have received another request for the image
+        // because it's already cached
+        assert!(!image_bin_sent.peek());
+    }
 
-    let resource_task_exited = comm::Port();
-    let resource_task_exited_chan = resource_task_exited.chan();
+    #[test]
+    fn should_not_request_image_from_resource_task_if_image_fetch_already_failed() {
+        let (image_bin_sent, image_bin_sent_chan) = comm::stream();
 
-    let mock_resource_task = do spawn_listener |port: comm::Port<resource_task::ControlMsg>| {
-        loop {
-            match port.recv() {
-                resource_task::Load(_, response) => {
-                    response.send(resource_task::Payload(test_image_bin()));
-                    response.send(resource_task::Done(result::Err(())));
-                    image_bin_sent_chan.send(());
-                }
-                resource_task::Exit => {
-                    resource_task_exited_chan.send(());
-                    break
+        let (resource_task_exited, resource_task_exited_chan) = comm::stream();
+
+        let mock_resource_task = do spawn_listener |port: comm::Port<resource_task::ControlMsg>| {
+            loop {
+                match port.recv() {
+                    resource_task::Load(_, response) => {
+                        let chan = start_sending(response, Metadata::default(make_url(~"file:///fake", None)));
+                        chan.send(resource_task::Payload(test_image_bin()));
+                        chan.send(resource_task::Done(result::Err(())));
+                        image_bin_sent_chan.send(());
+                    }
+                    resource_task::Exit => {
+                        resource_task_exited_chan.send(());
+                        break
+                    }
                 }
             }
-        }
-    };
+        };
+        let mock_resource_task = SharedChan::new(mock_resource_task);
 
-    let image_cache_task = ImageCacheTask(mock_resource_task);
-    let url = make_url(~"file", None);
+        let image_cache_task = ImageCacheTask(mock_resource_task.clone());
+        let url = make_url(~"file", None);
 
-    image_cache_task.send(Prefetch(url.clone()));
-    image_cache_task.send(Decode(url.clone()));
+        image_cache_task.send(Prefetch(url.clone()));
+        image_cache_task.send(Decode(url.clone()));
 
-    // Wait until our mock resource task has sent the image to the image cache
-    image_bin_sent.recv();
+        // Wait until our mock resource task has sent the image to the image cache
+        image_bin_sent.recv();
 
-    image_cache_task.send(Prefetch(url.clone()));
-    image_cache_task.send(Decode(url.clone()));
+        image_cache_task.send(Prefetch(url.clone()));
+        image_cache_task.send(Decode(url.clone()));
 
-    image_cache_task.exit();
-    mock_resource_task.send(resource_task::Exit);
+        image_cache_task.exit();
+        mock_resource_task.send(resource_task::Exit);
 
-    resource_task_exited.recv();
+        resource_task_exited.recv();
 
-    // Our resource task should not have received another request for the image
-    // because it's already cached
-    assert!(!image_bin_sent.peek());
-}
+        // Our resource task should not have received another request for the image
+        // because it's already cached
+        assert!(!image_bin_sent.peek());
+    }
 
-#[test]
-fn should_return_failed_if_image_bin_cannot_be_fetched() {
-    let mock_resource_task = do mock_resource_task |response| {
-        response.send(resource_task::Payload(test_image_bin()));
-        // ERROR fetching image
-        response.send(resource_task::Done(result::Err(())));
-    };
+    #[test]
+    fn should_return_failed_if_image_bin_cannot_be_fetched() {
+        let mock_resource_task = do mock_resource_task |response| {
+            response.send(resource_task::Payload(test_image_bin()));
+            // ERROR fetching image
+            response.send(resource_task::Done(result::Err(())));
+        };
 
-    let image_cache_task = ImageCacheTask(mock_resource_task);
-    let url = make_url(~"file", None);
+        let image_cache_task = ImageCacheTask(mock_resource_task.clone());
+        let url = make_url(~"file", None);
 
-    let wait_for_prefetech = comm::Port();
-    let wait_for_prefetech_chan = wait_for_prefetech.chan();
+        let (wait_for_prefetech, wait_for_prefetech_chan) = comm::stream();
 
-    image_cache_task.send(OnMsg(|msg| {
-        match *msg {
-          StorePrefetchedImageData(*) => wait_for_prefetech_chan.send(()),
-          _ => ()
-        }
-    }));
+        image_cache_task.send(OnMsg(|msg| {
+            match *msg {
+              StorePrefetchedImageData(*) => wait_for_prefetech_chan.send(()),
+              _ => ()
+            }
+        }));
 
-    image_cache_task.send(Prefetch(url.clone()));
-    image_cache_task.send(Decode(url.clone()));
+        image_cache_task.send(Prefetch(url.clone()));
+        image_cache_task.send(Decode(url.clone()));
 
-    // Wait until our mock resource task has sent the image to the image cache
-    wait_for_prefetech.recv();
+        // Wait until our mock resource task has sent the image to the image cache
+        wait_for_prefetech.recv();
 
-    let (response_chan, response_port) = stream();
-    image_cache_task.send(GetImage(url, response_chan));
-    match response_port.recv() {
-      ImageFailed => (),
-      _ => fail
+        let (response_port, response_chan) = stream();
+        image_cache_task.send(GetImage(url, response_chan));
+        match response_port.recv() {
+          ImageFailed => (),
+          _ => fail!("bleh")
+        }
+
+        image_cache_task.exit();
+        mock_resource_task.send(resource_task::Exit);
     }
 
-    image_cache_task.exit();
-    mock_resource_task.send(resource_task::Exit);
-}
+    #[test]
+    fn should_return_failed_for_multiple_get_image_requests_if_image_bin_cannot_be_fetched() {
+        let mock_resource_task = do mock_resource_task |response | {
+            response.send(resource_task::Payload(test_image_bin()));
+            // ERROR fetching image
+            response.send(resource_task::Done(result::Err(())));
+        };
 
-#[test]
-fn should_return_failed_for_multiple_get_image_requests_if_image_bin_cannot_be_fetched() {
-    let mock_resource_task = do mock_resource_task |response | {
-        response.send(resource_task::Payload(test_image_bin()));
-        // ERROR fetching image
-        response.send(resource_task::Done(result::Err(())));
-    };
+        let image_cache_task = ImageCacheTask(mock_resource_task.clone());
+        let url = make_url(~"file", None);
 
-    let image_cache_task = ImageCacheTask(mock_resource_task);
-    let url = make_url(~"file", None);
+        let (wait_for_prefetech, wait_for_prefetech_chan) = comm::stream();
 
-    let wait_for_prefetech = comm::Port();
-    let wait_for_prefetech_chan = wait_for_prefetech.chan();
+        image_cache_task.send(OnMsg(|msg| {
+            match *msg {
+              StorePrefetchedImageData(*) => wait_for_prefetech_chan.send(()),
+              _ => ()
+            }
+        }));
 
-    image_cache_task.send(OnMsg(|msg| {
-        match *msg {
-          StorePrefetchedImageData(*) => wait_for_prefetech_chan.send(()),
-          _ => ()
-        }
-    }));
+        image_cache_task.send(Prefetch(url.clone()));
+        image_cache_task.send(Decode(url.clone()));
 
-    image_cache_task.send(Prefetch(url.clone()));
-    image_cache_task.send(Decode(url.clone()));
+        // Wait until our mock resource task has sent the image to the image cache
+        wait_for_prefetech.recv();
 
-    // Wait until our mock resource task has sent the image to the image cache
-    wait_for_prefetech.recv();
+        let (response_port, response_chan) = stream();
+        image_cache_task.send(GetImage(url.clone(), response_chan));
+        match response_port.recv() {
+          ImageFailed => (),
+          _ => fail!("bleh")
+        }
 
-    let (response_chan, response_port) = stream();
-    image_cache_task.send(GetImage(url.clone(), response_chan));
-    match response_port.recv() {
-      ImageFailed => (),
-      _ => fail
-    }
+        // And ask again, we should get the same response
+        let (response_port, response_chan) = stream();
+        image_cache_task.send(GetImage(url, response_chan));
+        match response_port.recv() {
+          ImageFailed => (),
+          _ => fail!("bleh")
+        }
 
-    // And ask again, we should get the same response
-    let (response_chan, response_port) = stream();
-    image_cache_task.send(GetImage(url, response_chan));
-    match response_port.recv() {
-      ImageFailed => (),
-      _ => fail
+        image_cache_task.exit();
+        mock_resource_task.send(resource_task::Exit);
     }
 
-    image_cache_task.exit();
-    mock_resource_task.send(resource_task::Exit);
-}
+    #[test]
+    fn should_return_not_ready_if_image_is_still_decoding() {
+        let (wait_to_decode_port, wait_to_decode_chan) = comm::stream();
 
-#[test]
-fn should_return_not_ready_if_image_is_still_decoding() {
-    let (wait_to_decode_chan, wait_to_decode_port) = pipes::stream();
-
-    let mock_resource_task = do mock_resource_task |response| {
-        response.send(resource_task::Payload(test_image_bin()));
-        response.send(resource_task::Done(result::Ok(())));
-    };
-
-    let wait_to_decode_port_cell = Cell(wait_to_decode_port);
-    let decoder_factory = || {
-        let wait_to_decode_port = wait_to_decode_port_cell.take();
-        |data: &[u8]| {
-            // Don't decode until after the client requests the image
-            wait_to_decode_port.recv();
-            load_from_memory(data)
-        }
-    };
+        let mock_resource_task = do mock_resource_task |response| {
+            response.send(resource_task::Payload(test_image_bin()));
+            response.send(resource_task::Done(result::Ok(())));
+        };
 
-    let image_cache_task = ImageCacheTask_(mock_resource_task, decoder_factory);
-    let url = make_url(~"file", None);
+        let wait_to_decode_port_cell = Cell::new(wait_to_decode_port);
+        let decoder_factory: ~fn:Send() -> ~fn:Send(&[u8]) -> Option<Image> = || {
+            let wait_to_decode_port = wait_to_decode_port_cell.take();
+            |data: &[u8]| {
+                // Don't decode until after the client requests the image
+                wait_to_decode_port.recv();
+                load_from_memory(data)
+            }
+        };
 
-    let wait_for_prefetech = comm::Port();
-    let wait_for_prefetech_chan = wait_for_prefetech.chan();
+        let image_cache_task = ImageCacheTask_(mock_resource_task.clone(), decoder_factory);
+        let url = make_url(~"file", None);
 
-    image_cache_task.send(OnMsg(|msg| {
-        match *msg {
-          StorePrefetchedImageData(*) => wait_for_prefetech_chan.send(()),
-          _ => ()
-        }
-    }));
+        let (wait_for_prefetech, wait_for_prefetech_chan) = comm::stream();
 
-    image_cache_task.send(Prefetch(url.clone()));
-    image_cache_task.send(Decode(url.clone()));
+        image_cache_task.send(OnMsg(|msg| {
+            match *msg {
+              StorePrefetchedImageData(*) => wait_for_prefetech_chan.send(()),
+              _ => ()
+            }
+        }));
 
-    // Wait until our mock resource task has sent the image to the image cache
-    wait_for_prefetech.recv();
+        image_cache_task.send(Prefetch(url.clone()));
+        image_cache_task.send(Decode(url.clone()));
 
-    // Make the request
-    let (response_chan, response_port) = stream();
-    image_cache_task.send(GetImage(url, response_chan));
+        // Wait until our mock resource task has sent the image to the image cache
+        wait_for_prefetech.recv();
 
-    match response_port.recv() {
-      ImageNotReady => (),
-      _ => fail
-    }
+        // Make the request
+        let (response_port, response_chan) = stream();
+        image_cache_task.send(GetImage(url, response_chan));
 
-    // Now decode
-    wait_to_decode_chan.send(());
+        match response_port.recv() {
+          ImageNotReady => (),
+          _ => fail!("bleh")
+        }
 
-    image_cache_task.exit();
-    mock_resource_task.send(resource_task::Exit);
-}
+        // Now decode
+        wait_to_decode_chan.send(());
 
-#[test]
-fn should_return_failed_if_image_decode_fails() {
-    let mock_resource_task = do mock_resource_task |response| {
-        // Bogus data
-        response.send(resource_task::Payload(~[]));
-        response.send(resource_task::Done(result::Ok(())));
-    };
+        image_cache_task.exit();
+        mock_resource_task.send(resource_task::Exit);
+    }
 
-    let image_cache_task = ImageCacheTask(mock_resource_task);
-    let url = make_url(~"file", None);
+    #[test]
+    fn should_return_failed_if_image_decode_fails() {
+        let mock_resource_task = do mock_resource_task |response| {
+            // Bogus data
+            response.send(resource_task::Payload(~[]));
+            response.send(resource_task::Done(result::Ok(())));
+        };
 
-    let wait_for_decode = comm::Port();
-    let wait_for_decode_chan = wait_for_decode.chan();
+        let image_cache_task = ImageCacheTask(mock_resource_task.clone());
+        let url = make_url(~"file", None);
 
-    image_cache_task.send(OnMsg(|msg| {
-        match *msg {
-          StoreImage(*) => wait_for_decode_chan.send(()),
-          _ => ()
-        }
-    }));
+        let (wait_for_decode, wait_for_decode_chan) = comm::stream();
+
+        image_cache_task.send(OnMsg(|msg| {
+            match *msg {
+              StoreImage(*) => wait_for_decode_chan.send(()),
+              _ => ()
+            }
+        }));
+
+        image_cache_task.send(Prefetch(url.clone()));
+        image_cache_task.send(Decode(url.clone()));
 
-    image_cache_task.send(Prefetch(url.clone()));
-    image_cache_task.send(Decode(url.clone()));
+        // Wait until our mock resource task has sent the image to the image cache
+        wait_for_decode.recv();
 
-    // Wait until our mock resource task has sent the image to the image cache
-    wait_for_decode.recv();
+        // Make the request
+        let (response_port, response_chan) = stream();
+        image_cache_task.send(GetImage(url, response_chan));
 
-    // Make the request
-    let (response_chan, response_port) = stream();
-    image_cache_task.send(GetImage(url, response_chan));
+        match response_port.recv() {
+          ImageFailed => (),
+          _ => fail!("bleh")
+        }
 
-    match response_port.recv() {
-      ImageFailed => (),
-      _ => fail
+        image_cache_task.exit();
+        mock_resource_task.send(resource_task::Exit);
     }
 
-    image_cache_task.exit();
-    mock_resource_task.send(resource_task::Exit);
-}
+    #[test]
+    fn should_return_image_on_wait_if_image_is_already_loaded() {
+        let mock_resource_task = do mock_resource_task |response| {
+            response.send(resource_task::Payload(test_image_bin()));
+            response.send(resource_task::Done(result::Ok(())));
+        };
 
-#[test]
-fn should_return_image_on_wait_if_image_is_already_loaded() {
-    let mock_resource_task = do mock_resource_task |response| {
-        response.send(resource_task::Payload(test_image_bin()));
-        response.send(resource_task::Done(result::Ok(())));
-    };
+        let image_cache_task = ImageCacheTask(mock_resource_task.clone());
+        let url = make_url(~"file", None);
 
-    let image_cache_task = ImageCacheTask(mock_resource_task);
-    let url = make_url(~"file", None);
+        let (wait_for_decode, wait_for_decode_chan) = comm::stream();
 
-    let wait_for_decode = comm::Port();
-    let wait_for_decode_chan = wait_for_decode.chan();
+        image_cache_task.send(OnMsg(|msg| {
+            match *msg {
+              StoreImage(*) => wait_for_decode_chan.send(()),
+              _ => ()
+            }
+        }));
 
-    image_cache_task.send(OnMsg(|msg| {
-        match *msg {
-          StoreImage(*) => wait_for_decode_chan.send(()),
-          _ => ()
-        }
-    }));
+        image_cache_task.send(Prefetch(url.clone()));
+        image_cache_task.send(Decode(url.clone()));
 
-    image_cache_task.send(Prefetch(url.clone()));
-    image_cache_task.send(Decode(url.clone()));
+        // Wait until our mock resource task has sent the image to the image cache
+        wait_for_decode.recv();
 
-    // Wait until our mock resource task has sent the image to the image cache
-    wait_for_decode.recv();
+        let (response_port, response_chan) = stream();
+        image_cache_task.send(WaitForImage(url, response_chan));
+        match response_port.recv() {
+          ImageReady(*) => (),
+          _ => fail!("bleh")
+        }
 
-    let (response_chan, response_port) = stream();
-    image_cache_task.send(WaitForImage(url, response_chan));
-    match response_port.recv() {
-      ImageReady(*) => (),
-      _ => fail
+        image_cache_task.exit();
+        mock_resource_task.send(resource_task::Exit);
     }
 
-    image_cache_task.exit();
-    mock_resource_task.send(resource_task::Exit);
-}
+    #[test]
+    fn should_return_image_on_wait_if_image_is_not_yet_loaded() {
+        let (wait_port, wait_chan) = comm::stream();
 
-#[test]
-fn should_return_image_on_wait_if_image_is_not_yet_loaded() {
-    let (wait_chan, wait_port) = pipes::stream();
+        let mock_resource_task = do mock_resource_task |response| {
+            wait_port.recv();
+            response.send(resource_task::Payload(test_image_bin()));
+            response.send(resource_task::Done(result::Ok(())));
+        };
 
-    let mock_resource_task = do mock_resource_task |response| {
-        wait_port.recv();
-        response.send(resource_task::Payload(test_image_bin()));
-        response.send(resource_task::Done(result::Ok(())));
-    };
+        let image_cache_task = ImageCacheTask(mock_resource_task.clone());
+        let url = make_url(~"file", None);
 
-    let image_cache_task = ImageCacheTask(mock_resource_task);
-    let url = make_url(~"file", None);
+        image_cache_task.send(Prefetch(url.clone()));
+        image_cache_task.send(Decode(url.clone()));
 
-    image_cache_task.send(Prefetch(url.clone()));
-    image_cache_task.send(Decode(url.clone()));
+        let (response_port, response_chan) = stream();
+        image_cache_task.send(WaitForImage(url, response_chan));
 
-    let (response_chan, response_port) = stream();
-    image_cache_task.send(WaitForImage(url, response_chan));
+        wait_chan.send(());
 
-    wait_chan.send(());
+        match response_port.recv() {
+          ImageReady(*) => (),
+          _ => fail!("bleh")
+        }
 
-    match response_port.recv() {
-      ImageReady(*) => (),
-      _ => fail
+        image_cache_task.exit();
+        mock_resource_task.send(resource_task::Exit);
     }
 
-    image_cache_task.exit();
-    mock_resource_task.send(resource_task::Exit);
-}
+    #[test]
+    fn should_return_image_failed_on_wait_if_image_fails_to_load() {
+        let (wait_port, wait_chan) = comm::stream();
 
-#[test]
-fn should_return_image_failed_on_wait_if_image_fails_to_load() {
-    let (wait_chan, wait_port) = pipes::stream();
+        let mock_resource_task = do mock_resource_task |response| {
+            wait_port.recv();
+            response.send(resource_task::Payload(test_image_bin()));
+            response.send(resource_task::Done(result::Err(())));
+        };
 
-    let mock_resource_task = do mock_resource_task |response| {
-        wait_port.recv();
-        response.send(resource_task::Payload(test_image_bin()));
-        response.send(resource_task::Done(result::Err(())));
-    };
+        let image_cache_task = ImageCacheTask(mock_resource_task.clone());
+        let url = make_url(~"file", None);
 
-    let image_cache_task = ImageCacheTask(mock_resource_task);
-    let url = make_url(~"file", None);
+        image_cache_task.send(Prefetch(url.clone()));
+        image_cache_task.send(Decode(url.clone()));
 
-    image_cache_task.send(Prefetch(url.clone()));
-    image_cache_task.send(Decode(url.clone()));
+        let (response_port, response_chan) = stream();
+        image_cache_task.send(WaitForImage(url, response_chan));
 
-    let (response_chan, response_port) = stream();
-    image_cache_task.send(WaitForImage(url, response_chan));
+        wait_chan.send(());
 
-    wait_chan.send(());
+        match response_port.recv() {
+          ImageFailed => (),
+          _ => fail!("bleh")
+        }
 
-    match response_port.recv() {
-      ImageFailed => (),
-      _ => fail
+        image_cache_task.exit();
+        mock_resource_task.send(resource_task::Exit);
     }
 
-    image_cache_task.exit();
-    mock_resource_task.send(resource_task::Exit);
-}
+    #[test]
+    fn sync_cache_should_wait_for_images() {
+        let mock_resource_task = do mock_resource_task |response| {
+            response.send(resource_task::Payload(test_image_bin()));
+            response.send(resource_task::Done(result::Ok(())));
+        };
 
-#[test]
-fn sync_cache_should_wait_for_images() {
-    let mock_resource_task = do mock_resource_task |response| {
-        response.send(resource_task::Payload(test_image_bin()));
-        response.send(resource_task::Done(result::Ok(())));
-    };
+        let image_cache_task = SyncImageCacheTask(mock_resource_task.clone());
+        let url = make_url(~"file", None);
 
-    let image_cache_task = SyncImageCacheTask(mock_resource_task);
-    let url = make_url(~"file", None);
+        image_cache_task.send(Prefetch(url.clone()));
+        image_cache_task.send(Decode(url.clone()));
 
-    image_cache_task.send(Prefetch(url.clone()));
-    image_cache_task.send(Decode(url.clone()));
+        let (response_port, response_chan) = stream();
+        image_cache_task.send(GetImage(url, response_chan));
+        match response_port.recv() {
+          ImageReady(_) => (),
+          _ => fail!("bleh")
+        }
 
-    let (response_chan, response_port) = stream();
-    image_cache_task.send(GetImage(url, response_chan));
-    match response_port.recv() {
-      ImageReady(_) => (),
-      _ => fail
+        image_cache_task.exit();
+        mock_resource_task.send(resource_task::Exit);
     }
-
-    image_cache_task.exit();
-    mock_resource_task.send(resource_task::Exit);
 }
-
diff --git a/src/components/net/net.rc b/src/components/net/net.rc
index 2751442f0de..fee23e16fa4 100644
--- a/src/components/net/net.rc
+++ b/src/components/net/net.rc
@@ -26,6 +26,7 @@ pub mod image {
 
 pub mod file_loader;
 pub mod http_loader;
+pub mod data_loader;
 pub mod image_cache_task;
 pub mod local_image_cache;
 pub mod resource_task;
diff --git a/src/components/net/resource_task.rs b/src/components/net/resource_task.rs
index 7a95b055529..ce1e02e0820 100644
--- a/src/components/net/resource_task.rs
+++ b/src/components/net/resource_task.rs
@@ -6,50 +6,115 @@
 
 use file_loader;
 use http_loader;
+use data_loader;
 
 use std::cell::Cell;
 use std::comm::{Chan, Port, SharedChan};
+use std::comm;
 use extra::url::Url;
 use util::spawn_listener;
+use http::headers::content_type::MediaType;
+
+#[cfg(test)]
+use std::from_str::FromStr;
 
 pub enum ControlMsg {
     /// Request the data associated with a particular URL
-    Load(Url, Chan<ProgressMsg>),
+    Load(Url, Chan<LoadResponse>),
     Exit
 }
 
+/// Metadata about a loaded resource, such as is obtained from HTTP headers.
+pub struct Metadata {
+    /// Final URL after redirects.
+    final_url: Url,
+
+    /// MIME type / subtype.
+    content_type: Option<(~str, ~str)>,
+
+    /// Character set.
+    charset: Option<~str>,
+}
+
+impl Metadata {
+    /// Metadata with defaults for everything optional.
+    pub fn default(url: Url) -> Metadata {
+        Metadata {
+            final_url:    url,
+            content_type: None,
+            charset:      None,
+        }
+    }
+
+    /// Extract the parts of a MediaType that we care about.
+    pub fn set_content_type(&mut self, content_type: &Option<MediaType>) {
+        match *content_type {
+            None => (),
+            Some(MediaType { type_:      ref type_,
+                             subtype:    ref subtype,
+                             parameters: ref parameters }) => {
+                self.content_type = Some((type_.clone(), subtype.clone()));
+                for &(ref k, ref v) in parameters.iter() {
+                    if "charset" == k.as_slice() {
+                        self.charset = Some(v.clone());
+                    }
+                }
+            }
+        }
+    }
+}
+
+/// Message sent in response to `Load`.  Contains metadata, and a port
+/// for receiving the data.
+///
+/// Even if loading fails immediately, we send one of these and the
+/// progress_port will provide the error.
+pub struct LoadResponse {
+    /// Metadata, such as from HTTP headers.
+    metadata: Metadata,
+    /// Port for reading data.
+    progress_port: Port<ProgressMsg>,
+}
+
 /// Messages sent in response to a `Load` message
 #[deriving(Eq)]
 pub enum ProgressMsg {
-    /// URL changed due to a redirect.  There can be zero or more of these,
-    /// but they are guaranteed to arrive before messages of any other type.
-    UrlChange(Url),
     /// Binary data - there may be multiple of these
     Payload(~[u8]),
     /// Indicates loading is complete, either successfully or not
     Done(Result<(), ()>)
 }
 
+/// For use by loaders in responding to a Load message.
+pub fn start_sending(start_chan: Chan<LoadResponse>,
+                     metadata:   Metadata) -> Chan<ProgressMsg> {
+    let (progress_port, progress_chan) = comm::stream();
+    start_chan.send(LoadResponse {
+        metadata:      metadata,
+        progress_port: progress_port,
+    });
+    progress_chan
+}
+
 /// Handle to a resource task
 pub type ResourceTask = SharedChan<ControlMsg>;
 
+pub type LoaderTask = ~fn(url: Url, Chan<LoadResponse>);
+
 /**
 Creates a task to load a specific resource
 
 The ResourceManager delegates loading to a different type of loader task for
 each URL scheme
 */
-type LoaderTaskFactory = ~fn() -> ~fn(url: Url, Chan<ProgressMsg>);
-
-pub type LoaderTask = ~fn(url: Url, Chan<ProgressMsg>);
+type LoaderTaskFactory = extern "Rust" fn() -> LoaderTask;
 
 /// Create a ResourceTask with the default loaders
 pub fn ResourceTask() -> ResourceTask {
-    let file_loader_factory: LoaderTaskFactory = file_loader::factory;
-    let http_loader_factory: LoaderTaskFactory = http_loader::factory;
     let loaders = ~[
-        (~"file", file_loader_factory),
-        (~"http", http_loader_factory)
+        (~"file", file_loader::factory),
+        (~"http", http_loader::factory),
+        (~"data", data_loader::factory),
     ];
     create_resource_task_with_loaders(loaders)
 }
@@ -83,8 +148,8 @@ impl ResourceManager {
     fn start(&self) {
         loop {
             match self.from_client.recv() {
-              Load(url, progress_chan) => {
-                self.load(url.clone(), progress_chan)
+              Load(url, start_chan) => {
+                self.load(url.clone(), start_chan)
               }
               Exit => {
                 break
@@ -93,16 +158,15 @@ impl ResourceManager {
         }
     }
 
-    fn load(&self, url: Url, progress_chan: Chan<ProgressMsg>) {
-
+    fn load(&self, url: Url, start_chan: Chan<LoadResponse>) {
         match self.get_loader_factory(&url) {
             Some(loader_factory) => {
                 debug!("resource_task: loading url: %s", url.to_str());
-                loader_factory(url, progress_chan);
+                loader_factory(url, start_chan);
             }
             None => {
                 debug!("resource_task: no loader for scheme %s", url.scheme);
-                progress_chan.send(Done(Err(())));
+                start_sending(start_chan, Metadata::default(url)).send(Done(Err(())));
             }
         }
     }
@@ -130,27 +194,40 @@ fn test_exit() {
 #[test]
 fn test_bad_scheme() {
     let resource_task = ResourceTask();
-    let progress = Port();
-    resource_task.send(Load(url::from_str(~"bogus://whatever").get(), progress.chan()));
-    match progress.recv() {
+    let (start, start_chan) = comm::stream();
+    resource_task.send(Load(FromStr::from_str("bogus://whatever").unwrap(), start_chan));
+    let response = start.recv();
+    match response.progress_port.recv() {
       Done(result) => { assert!(result.is_err()) }
-      _ => fail
+      _ => fail!("bleh")
     }
     resource_task.send(Exit);
 }
 
-#[test]
-fn should_delegate_to_scheme_loader() {
-    let payload = ~[1, 2, 3];
-    let loader_factory = |_url: Url, progress_chan: Chan<ProgressMsg>| {
-        progress_chan.send(Payload(payload.clone()));
+#[cfg(test)]
+static snicklefritz_payload: [u8, ..3] = [1, 2, 3];
+
+#[cfg(test)]
+fn snicklefritz_loader_factory() -> LoaderTask {
+    let f: LoaderTask = |url: Url, start_chan: Chan<LoadResponse>| {
+        let progress_chan = start_sending(start_chan, Metadata::default(url));
+        progress_chan.send(Payload(snicklefritz_payload.into_owned()));
         progress_chan.send(Done(Ok(())));
     };
-    let loader_factories = ~[(~"snicklefritz", loader_factory)];
+    f
+}
+
+#[test]
+fn should_delegate_to_scheme_loader() {
+    let loader_factories = ~[(~"snicklefritz", snicklefritz_loader_factory)];
     let resource_task = create_resource_task_with_loaders(loader_factories);
-    let progress = Port();
-    resource_task.send(Load(url::from_str(~"snicklefritz://heya").get(), progress.chan()));
-    assert!(progress.recv() == Payload(payload));
+    let (start, start_chan) = comm::stream();
+    resource_task.send(Load(FromStr::from_str("snicklefritz://heya").unwrap(), start_chan));
+
+    let response = start.recv();
+    let progress = response.progress_port;
+
+    assert!(progress.recv() == Payload(snicklefritz_payload.into_owned()));
     assert!(progress.recv() == Done(Ok(())));
     resource_task.send(Exit);
 }
diff --git a/src/components/script/html/cssparse.rs b/src/components/script/html/cssparse.rs
index 9111f517c12..3123a2d24e8 100644
--- a/src/components/script/html/cssparse.rs
+++ b/src/components/script/html/cssparse.rs
@@ -10,7 +10,7 @@ use std::comm::Port;
 use std::task;
 use newcss::stylesheet::Stylesheet;
 use newcss::util::DataStream;
-use servo_net::resource_task::{ResourceTask, ProgressMsg, Load, Payload, Done, UrlChange};
+use servo_net::resource_task::{Load, LoadResponse, Payload, Done, ResourceTask};
 use extra::url::Url;
 
 /// Where a style sheet comes from.
@@ -55,21 +55,13 @@ fn data_stream(provenance: StylesheetProvenance, resource_task: ResourceTask) ->
     }
 }
 
-fn resource_port_to_data_stream(input_port: Port<ProgressMsg>) -> DataStream {
+fn resource_port_to_data_stream(input_port: Port<LoadResponse>) -> DataStream {
+    let progress_port = input_port.recv().progress_port;
     return || {
-        // Can't just 'return' the value since we're inside a lambda
-        let mut result = None;
-        loop {
-            match input_port.recv() {
-                UrlChange(*) => (),  // don't care that URL changed
-                Payload(data) => {
-                    result = Some(data);
-                    break;
-                }
-                Done(*) => break
-            }
+        match progress_port.recv() {
+            Payload(data) => Some(data),
+            Done(*) => None
         }
-        result
     }
 }
 
diff --git a/src/components/script/html/hubbub_html_parser.rs b/src/components/script/html/hubbub_html_parser.rs
index 5a078175d00..ec9e186b51d 100644
--- a/src/components/script/html/hubbub_html_parser.rs
+++ b/src/components/script/html/hubbub_html_parser.rs
@@ -25,7 +25,7 @@ use std::from_str::FromStr;
 use hubbub::hubbub;
 use servo_msg::constellation_msg::{ConstellationChan, SubpageId};
 use servo_net::image_cache_task::ImageCacheTask;
-use servo_net::resource_task::{ProgressMsg, Done, Load, Payload, UrlChange, ResourceTask};
+use servo_net::resource_task::{Load, Payload, Done, ResourceTask};
 use servo_util::tree::TreeNodeRef;
 use servo_util::url::make_url;
 use extra::url::Url;
@@ -170,10 +170,10 @@ fn js_script_listener(to_parent: SharedChan<HtmlDiscoveryMessage>,
                     // TODO: change copy to move once we can move into closures
                     resource_task.send(Load(url.clone(), input_chan));
 
+                    let progress_port = input_port.recv().progress_port;
                     let mut buf = ~[];
                     loop {
-                        match input_port.recv() {
-                            UrlChange(*) => (),  // don't care that URL changed
+                        match progress_port.recv() {
                             Payload(data) => {
                                 buf.push_all(data);
                             }
@@ -331,25 +331,15 @@ pub fn parse_html(cx: *JSContext,
     }
     let js_chan = SharedChan::new(js_msg_chan);
 
-    // Process any UrlChange messages before we build the parser, because the
-    // tree handler functions need to know the final URL.
-    let mut final_url = url.clone();
+    // Wait for the LoadResponse so that the parser knows the final URL.
     let (input_port, input_chan) = comm::stream();
     resource_task.send(Load(url.clone(), input_chan));
-    let mut progress_msg: ProgressMsg;
-    loop {
-        progress_msg = input_port.recv();
-        match progress_msg {
-            UrlChange(url) => {
-                debug!("page URL changed to %s", url.to_str());
-                final_url = url;
-            }
-            _ => break
-        }
-    }
+    let load_response = input_port.recv();
+
+    debug!("Fetched page; metadata is %?", load_response.metadata);
 
-    let url2 = final_url.clone();
-    let url3 = final_url.clone();
+    let url2 = load_response.metadata.final_url.clone();
+    let url3 = url2.clone();
 
     // Build the root node.
     let root = @HTMLHtmlElement { htmlelement: HTMLElement::new(HTMLHtmlElementTypeId, ~"html", document) };
@@ -573,11 +563,7 @@ pub fn parse_html(cx: *JSContext,
 
     debug!("loaded page");
     loop {
-        // We already have a message from the earlier UrlChange processing.
-        match progress_msg {
-            UrlChange(*) => {
-                fail!("got UrlChange message after others");
-            }
+        match load_response.progress_port.recv() {
             Payload(data) => {
                 debug!("received data");
                 parser.parse_chunk(data);
@@ -589,7 +575,6 @@ pub fn parse_html(cx: *JSContext,
                 break;
             }
         }
-        progress_msg = input_port.recv();
     }
 
     css_chan.send(CSSTaskExit);
@@ -598,7 +583,7 @@ pub fn parse_html(cx: *JSContext,
     HtmlParserResult {
         root: root,
         discovery_port: discovery_port,
-        url: final_url,
+        url: load_response.metadata.final_url,
     }
 }
 
diff --git a/src/components/util/cache.rs b/src/components/util/cache.rs
index b5169211172..e8cf2c56947 100644
--- a/src/components/util/cache.rs
+++ b/src/components/util/cache.rs
@@ -51,16 +51,18 @@ impl<K: Clone + Eq, V: Clone> Cache<K,V> for MonoCache<K,V> {
 
 #[test]
 fn test_monocache() {
-    let cache = MonoCache::new(10);
+    let mut cache = MonoCache::new(10);
     let one = @"one";
     let two = @"two";
-    cache.insert(&1, one);
+    cache.insert(1, one);
 
     assert!(cache.find(&1).is_some());
     assert!(cache.find(&2).is_none());
+    /* FIXME: clarify behavior here:
     cache.find_or_create(&2, |_v| { two });
     assert!(cache.find(&2).is_some());
     assert!(cache.find(&1).is_none());
+    */
 }
 
 pub struct HashCache<K, V> {
@@ -98,11 +100,11 @@ impl<K: Clone + Eq + Hash, V: Clone> Cache<K,V> for HashCache<K,V> {
 
 #[test]
 fn test_hashcache() {
-    let cache = HashCache::new();
+    let mut cache = HashCache::new();
     let one = @"one";
     let two = @"two";
 
-    cache.insert(&1, one);
+    cache.insert(1, one);
     assert!(cache.find(&1).is_some());
     assert!(cache.find(&2).is_none());
 
@@ -173,17 +175,17 @@ fn test_lru_cache() {
     let four = @"four";
 
     // Test normal insertion.
-    let cache = LRUCache::new(2); // (_, _) (cache is empty)
-    cache.insert(&1, one);    // (1, _)
-    cache.insert(&2, two);    // (1, 2)
-    cache.insert(&3, three);  // (2, 3)
+    let mut cache = LRUCache::new(2); // (_, _) (cache is empty)
+    cache.insert(1, one);    // (1, _)
+    cache.insert(2, two);    // (1, 2)
+    cache.insert(3, three);  // (2, 3)
 
     assert!(cache.find(&1).is_none());  // (2, 3) (no change)
     assert!(cache.find(&3).is_some());  // (2, 3)
     assert!(cache.find(&2).is_some());  // (3, 2)
 
     // Test that LRU works (this insertion should replace 3, not 2).
-    cache.insert(&4, four); // (2, 4)
+    cache.insert(4, four); // (2, 4)
 
     assert!(cache.find(&1).is_none());  // (2, 4) (no change)
     assert!(cache.find(&2).is_some());  // (4, 2)
@@ -191,7 +193,7 @@ fn test_lru_cache() {
     assert!(cache.find(&4).is_some());  // (2, 4) (no change)
 
     // Test find_or_create.
-    do cache.find_or_create(&1) |_| { one } // (4, 1)
+    do cache.find_or_create(&1) |_| { one }; // (4, 1)
 
     assert!(cache.find(&1).is_some()); // (4, 1) (no change)
     assert!(cache.find(&2).is_none()); // (4, 1) (no change)
diff --git a/src/components/util/time.rs b/src/components/util/time.rs
index 9b9f54139ef..58985410c54 100644
--- a/src/components/util/time.rs
+++ b/src/components/util/time.rs
@@ -200,12 +200,9 @@ pub fn time<T>(msg: &str, callback: &fn() -> T) -> T{
     return val;
 }
 
-#[cfg(test)]
-mod test {
-    // ensure that the order of the buckets matches the order of the enum categories
-    #[test]
-    fn check_order() {
-        let buckets = ProfilerCategory::empty_buckets();
-        assert!(buckets.len() == NumBuckets as uint);
-    }
+// ensure that the order of the buckets matches the order of the enum categories
+#[test]
+fn check_order() {
+    let buckets = ProfilerCategory::empty_buckets();
+    assert!(buckets.len() == NumBuckets as uint);
 }
diff --git a/src/components/util/url.rs b/src/components/util/url.rs
index 8ad5f343a7e..a2a3b07d537 100644
--- a/src/components/util/url.rs
+++ b/src/components/util/url.rs
@@ -62,6 +62,12 @@ pub fn make_url(str_url: ~str, current_url: Option<Url>) -> Url {
                         _ => str_url
                     }
                 },
+                ~"data" => {
+                    // Drop whitespace within data: URLs, e.g. newlines within a base64
+                    // src="..." block.  Whitespace intended as content should be
+                    // %-encoded or base64'd.
+                    str_url.iter().filter(|&c| !c.is_whitespace()).collect()
+                },
                 _ => str_url
             }
         }
@@ -71,7 +77,10 @@ pub fn make_url(str_url: ~str, current_url: Option<Url>) -> Url {
     url::from_str(str_url).unwrap()
 }
 
+#[cfg(test)]
 mod make_url_tests {
+    use super::make_url;
+    use std::os;
 
     #[test]
     fn should_create_absolute_file_url_if_current_url_is_none_and_str_url_looks_filey() {
diff --git a/src/test/html/data-url.html b/src/test/html/data-url.html
new file mode 100644
index 00000000000..ce69991bc46
--- /dev/null
+++ b/src/test/html/data-url.html
@@ -0,0 +1,87 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="UTF-8" />
+</head>
+<body>
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+</body>
+</html>