Fix fetching about:blank

When fetching about:blank, response body should be the empty byte
sequence.
Spec: https://fetch.spec.whatwg.org/#concept-basic-fetch

Before this change, response body would be set to `ResponseBody::Empty`,
and then fetching would result in an infinite loop at step 19 in fn
`main_fetch` (methods.rs).

1 files changed, 14 insertions, 0 deletions

diff --git a/tests/unit/net/fetch.rs b/tests/unit/net/fetch.rs
index 010d49e5732..1a6168f77d6 100644
--- a/tests/unit/net/fetch.rs
+++ b/tests/unit/net/fetch.rs
@@ -95,6 +95,20 @@ fn test_fetch_response_body_matches_const_message() {
 }
 
 #[test]
+fn test_fetch_aboutblank() {
+
+    let url = Url::parse("about:blank").unwrap();
+    let origin = Origin::Origin(url.origin());
+    let mut request = Request::new(url, Some(origin), false);
+    request.referer = Referer::NoReferer;
+    let wrapped_request = Rc::new(request);
+
+    let fetch_response = fetch(wrapped_request);
+    assert!(!fetch_response.is_network_error());
+    assert!(*fetch_response.body.lock().unwrap() == ResponseBody::Done(vec![]));
+}
+
+#[test]
 fn test_fetch_response_is_basic_filtered() {
 
     static MESSAGE: &'static [u8] = b"";