servo: Merge #17835 - Make network error messages more specific (from…

… KiChjang:clearer-network-error); r=emilio

Instead of having a bogus "Network error" string, we extract the NetworkError struct from the Response and send it back to FetchResponseListener.

Source-Repo: https://github.com/servo/servo
Source-Revision: a56bd4663b30e3a5722d095b412b4340cf695cac

servo/components/net_traits/lib.rs

@@ -228,10 +228,8 @@ impl FetchTaskTarget for IpcSender<FetchResponseMsg> {
     }
 
     fn process_response_eof(&mut self, response: &Response) {
-        if response.is_network_error() {
-            // todo: finer grained errors
-            let _ =
-                self.send(FetchResponseMsg::ProcessResponseEOF(Err(NetworkError::Internal("Network error".into()))));
+        if let Some(e) = response.get_network_error() {
+            let _ = self.send(FetchResponseMsg::ProcessResponseEOF(Err(e.clone())));
         } else {
             let _ = self.send(FetchResponseMsg::ProcessResponseEOF(Ok(())));
         }