Add useful debug output for HTTP response and image cache.

components/net/http_loader.rs

@@ -1333,6 +1333,7 @@ fn http_network_fetch(
         res.status(),
         res.status().canonical_reason().unwrap_or("").into(),
     ));
+    debug!("got {:?} response for {:?}", res.status(), request.url());
     response.raw_status = Some((
         res.status().as_u16(),
         res.status().canonical_reason().unwrap_or("").into(),
@@ -1387,6 +1388,8 @@ fn http_network_fetch(
     let done_sender3 = done_sender.clone();
     let timing_ptr2 = context.timing.clone();
     let timing_ptr3 = context.timing.clone();
+    let url1 = request.url();
+    let url2 = url1.clone();
     HANDLE.lock().unwrap().spawn(
         res.into_body()
             .map_err(|_| ())
@@ -1404,6 +1407,7 @@ fn http_network_fetch(
                 future::ok(res_body)
             })
             .and_then(move |res_body| {
+                debug!("successfully finished response for {:?}", url1);
                 let mut body = res_body.lock().unwrap();
                 let completed_body = match *body {
                     ResponseBody::Receiving(ref mut body) => mem::replace(body, vec![]),
@@ -1418,6 +1422,7 @@ fn http_network_fetch(
                 future::ok(())
             })
             .map_err(move |_| {
+                debug!("finished response for {:?} with error", url2);
                 let mut body = res_body2.lock().unwrap();
                 let completed_body = match *body {
                     ResponseBody::Receiving(ref mut body) => mem::replace(body, vec![]),

components/net/image_cache.rs

@@ -530,6 +530,7 @@ impl ImageCache for ImageCacheImpl {
             (FetchResponseMsg::ProcessRequestBody, _) |
             (FetchResponseMsg::ProcessRequestEOF, _) => return,
             (FetchResponseMsg::ProcessResponse(response), _) => {
+                debug!("Received {:?} for {:?}", response.as_ref().map(|_| ()), id);
                 let mut store = self.store.lock().unwrap();
                 let pending_load = store.pending_loads.get_by_key_mut(&id).unwrap();
                 let (cors_status, metadata) = match response {

components/script/dom/htmlimageelement.rs

@@ -186,6 +186,7 @@ impl FetchResponseListener for ImageContext {
     fn process_request_eof(&mut self) {}
 
     fn process_response(&mut self, metadata: Result<FetchMetadata, NetworkError>) {
+        debug!("got {:?} for {:?}", metadata.as_ref().map(|_| ()), self.url);
         self.image_cache
             .notify_pending_response(self.id, FetchResponseMsg::ProcessResponse(metadata.clone()));
 

components/url/lib.rs

@@ -180,7 +180,8 @@ impl fmt::Display for ServoUrl {
 impl fmt::Debug for ServoUrl {
     fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
         if self.0.as_str().len() > 40 {
-            let hasher = DefaultHasher::new();
+            let mut hasher = DefaultHasher::new();
+            hasher.write(self.0.as_str().as_bytes());
             let truncated: String = self.0.as_str().chars().take(40).collect();
             let result = format!("{}... ({:x})", truncated, hasher.finish());
             return result.fmt(formatter);