Update response handling in main_fetch (#34570)

Signed-off-by: Shane Handley <shanehandley@fastmail.com>

components/net/fetch/methods.rs

@@ -176,7 +176,7 @@ pub async fn fetch_with_cors_cache(
     }
 
     // Step 17: Run main fetch given fetchParams.
-    main_fetch(request, cache, false, false, target, &mut None, context).await;
+    main_fetch(request, cache, false, target, &mut None, context).await;
 
     // Step 18: Return fetchParams’s controller.
     // TODO: We don't implement fetchParams as defined in the spec
@@ -215,7 +215,6 @@ pub fn should_request_be_blocked_by_csp(
 pub async fn main_fetch(
     request: &mut Request,
     cache: &mut CorsCache,
-    cors_flag: bool,
     recursive_flag: bool,
     target: Target<'_>,
     done_chan: &mut DoneChannel,
@@ -323,18 +322,21 @@ pub async fn main_fetch(
                 false
             };
 
-            if (same_origin && !cors_flag) ||
-                current_scheme == "chrome" ||
-                context.protocols.is_fetchable(current_scheme) ||
+            // request's current URL's origin is same origin with request's origin, and request's
+            // response tainting is "basic"
+            if (same_origin && request.response_tainting == ResponseTainting::Basic) ||
+                // request's current URL's scheme is "data"
+                current_scheme == "data" ||
+                // request's mode is "navigate" or "websocket"
                 matches!(
                     request.mode,
                     RequestMode::Navigate | RequestMode::WebSocket { .. }
                 )
             {
-                // Substep 1.
+                // Substep 1. Set request’s response tainting to "basic".
                 request.response_tainting = ResponseTainting::Basic;
 
-                // Substep 2.
+                // Substep 2. Return the result of running scheme fetch given fetchParams.
                 scheme_fetch(request, cache, target, done_chan, context).await
             } else if request.mode == RequestMode::SameOrigin {
                 Response::network_error(NetworkError::Internal("Cross-origin response".into()))

components/net/http_loader.rs

@@ -1086,16 +1086,8 @@ pub async fn http_redirect_fetch(
     let recursive_flag = request.redirect_mode != RedirectMode::Manual;
 
     // Step 22: Return the result of running main fetch given fetchParams and recursive.
-    let fetch_response = main_fetch(
-        request,
-        cache,
-        cors_flag,
-        recursive_flag,
-        target,
-        done_chan,
-        context,
-    )
-    .await;
+    let fetch_response =
+        main_fetch(request, cache, recursive_flag, target, done_chan, context).await;
 
     // TODO: timing allow check
     context

tests/wpt/meta/css/cssom/stylesheet-same-origin.sub.html.ini

@@ -1,7 +1,3 @@
 [stylesheet-same-origin.sub.html]
-  [Origin-clean check in cross-origin CSSOM Stylesheets (redirect from cross-origin to same-origin)]
-    expected: FAIL
-
   [Origin-clean check in loading error CSSOM Stylesheets]
     expected: FAIL
-

tests/wpt/meta/fetch/api/redirect/redirect-back-to-original-origin.any.js.ini

@@ -1,12 +1,6 @@
 [redirect-back-to-original-origin.any.html]
-  [original => remote => original with mode: "no-cors"]
-    expected: FAIL
-
 
 [redirect-back-to-original-origin.any.worker.html]
-  [original => remote => original with mode: "no-cors"]
-    expected: FAIL
-
 
 [redirect-back-to-original-origin.any.serviceworker.html]
   expected: ERROR

tests/wpt/meta/fetch/images/canvas-remote-read-remote-image-redirect.html.ini

@@ -1,3 +0,0 @@
-[canvas-remote-read-remote-image-redirect.html]
-  [Load a no-cors image from a same-origin URL that redirects to a cross-origin URL that redirects to the initial origin]
-    expected: FAIL