Revise filtering for Content-Encoding in ResourceTiming

resource-timing/content-encoding.https.html

@@ -33,10 +33,16 @@
     run_same_origin_test("/resource-timing/resources/foo.text.zst", "zstd");
     run_same_origin_test("/resource-timing/resources/compressed-js.py?content_encoding=deflate", "deflate");
     run_same_origin_test("/resource-timing/resources/compressed-js.py?content_encoding=gzip", "gzip");
-    run_same_origin_test("/resource-timing/resources/compressed-js.py?content_encoding=identity", "identity");
     // Unrecognized content encoding value should be transformed to "unknown".
     run_same_origin_test("/resource-timing/resources/compressed-js.py?content_encoding=unrecognizedname", "unknown");
-
+    // "identity" is not allowed in response header and should be transformed to "unknown".
+    run_same_origin_test("/resource-timing/resources/compressed-js.py?content_encoding=identity", "unknown");
+    // Mult-encodinging and formatting tests.
+    run_same_origin_test("/resource-timing/resources/content-encoding-headers.py?content_encoding=gzip, deflate,Apple", "multiple");
+    run_same_origin_test("/resource-timing/resources/content-encoding-headers.py?content_encoding=gzip, ", "multiple");
+    run_same_origin_test("/resource-timing/resources/content-encoding-headers.py?content_encoding=gZip ", "gzip");
+    // Empty value test.
+    run_same_origin_test("/resource-timing/resources/content-encoding-headers.py?content_encoding=", "");
 
     const run_cross_origin_test = (path) => {
       const url = new URL(path, REMOTE_ORIGIN);

resource-timing/resources/content-encoding-headers.py

@@ -0,0 +1,15 @@
+import os.path
+
+# Return arbitory content-encoding header value.
+
+def read(file):
+    path = os.path.join(os.path.dirname(__file__), file)
+    return open(path, u"rb").read()
+
+def main(request, response):
+    response.headers.set(b"Content-Type", b"text/javascript")
+    response.content = read(u"./dummy.js")
+
+    if b'content_encoding' in request.GET:
+        content_encoding = request.GET.first(b"content_encoding")
+        response.headers.set(b"Content-Encoding", content_encoding)