2 files changed, 16 insertions, 2 deletions
diff --git a/components/constellation/constellation.rs b/components/constellation/constellation.rs
index 265db68e7ae..a6cb9df5532 100644
--- a/components/constellation/constellation.rs
+++ b/components/constellation/constellation.rs
@@ -166,7 +166,7 @@ use servo_config::{opts, pref};
 use servo_rand::{random, Rng, ServoRng, SliceRandom};
 use servo_remutex::ReentrantMutex;
 use servo_url::{Host, ImmutableOrigin, ServoUrl};
-use std::borrow::ToOwned;
+use std::borrow::{Cow, ToOwned};
 use std::collections::hash_map::Entry;
 use std::collections::{HashMap, HashSet, VecDeque};
 use std::marker::PhantomData;
@@ -503,6 +503,9 @@ pub struct Constellation<Message, LTF, STF, SWF> {
 
     /// Pipeline ID of the active media session.
     active_media_session: Option<PipelineId>,
+
+    /// User agent string to report in network requests.
+    user_agent: Cow<'static, str>,
 }
 
 /// State needed to construct a constellation.
@@ -562,6 +565,9 @@ pub struct InitialConstellationState {
 
     /// A flag share with the compositor to indicate that a WR frame is in progress.
     pub pending_wr_frame: Arc<AtomicBool>,
+
+    /// User agent string to report in network requests.
+    pub user_agent: Cow<'static, str>,
 }
 
 /// Data needed for webdriver
@@ -1021,6 +1027,7 @@ where
                     player_context: state.player_context,
                     event_loop_waker: state.event_loop_waker,
                     active_media_session: None,
+                    user_agent: state.user_agent,
                 };
 
                 constellation.run();
@@ -1268,6 +1275,7 @@ where
             webxr_registry: self.webxr_registry.clone(),
             player_context: self.player_context.clone(),
             event_loop_waker: self.event_loop_waker.as_ref().map(|w| (*w).clone_box()),
+            user_agent: self.user_agent.clone(),
         });
 
         let pipeline = match result {
diff --git a/components/constellation/pipeline.rs b/components/constellation/pipeline.rs
index 16cb67ab9a2..9739ecf32af 100644
--- a/components/constellation/pipeline.rs
+++ b/components/constellation/pipeline.rs
@@ -41,6 +41,7 @@ use script_traits::{ScriptThreadFactory, TimerSchedulerMsg, WindowSizeData};
 use servo_config::opts::{self, Opts};
 use servo_config::{prefs, prefs::PrefValue};
 use servo_url::ServoUrl;
+use std::borrow::Cow;
 use std::collections::{HashMap, HashSet};
 use std::rc::Rc;
 use std::sync::atomic::AtomicBool;
@@ -201,6 +202,9 @@ pub struct InitialPipelineState {
 
     /// Mechanism to force the compositor to process events.
     pub event_loop_waker: Option<Box<dyn EventLoopWaker>>,
+
+    /// User agent string to report in network requests.
+    pub user_agent: Cow<'static, str>,
 }
 
 pub struct NewPipeline {
@@ -304,6 +308,7 @@ impl Pipeline {
                     webvr_chan: state.webvr_chan,
                     webxr_registry: state.webxr_registry,
                     player_context: state.player_context,
+                    user_agent: state.user_agent,
                 };
 
                 // Spawn the child process.
@@ -520,6 +525,7 @@ pub struct UnprivilegedPipelineContent {
     webvr_chan: Option<IpcSender<WebVRMsg>>,
     webxr_registry: webxr_api::Registry,
     player_context: WindowGLContext,
+    user_agent: Cow<'static, str>,
 }
 
 impl UnprivilegedPipelineContent {
@@ -588,7 +594,7 @@ impl UnprivilegedPipelineContent {
             self.opts.userscripts,
             self.opts.headless,
             self.opts.replace_surrogates,
-            self.opts.user_agent,
+            self.user_agent,
         );
 
         LTF::create(