[Webkit-unassigned] [Bug 211414] New: performance.getEntriesByType('resource') does not include 404 responses

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=211414

            Bug ID: 211414
           Summary: performance.getEntriesByType('resource') does not
                    include 404 responses
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bugmail at eligrey.com

Created attachment 398439

  --> https://bugs.webkit.org/attachment.cgi?id=398439&action=review

HTML script element-initiated request with 404 response (comparing Firefox, Safari, Chrome, and Edge)

This is equivalent to the following Chrome bug: https://bugs.chromium.org/p/chromium/issues/detail?id=883400

Steps to reproduce the problem:
1. Load a page that requests a script that responds with a status code of 404.
2. Open Console in Developer Tools
3. Enter "var urls = []; window.performance.getEntriesByType('resource').forEach(function(r){urls.push(r.name)});"
4. The URL returning the 404 will not be displayed in the list of URLs

What is the expected behavior?
The URL returning the 404 should be displayed in the list of URLs.

See the attached screenshots to see how Safari treats 404s from different request initiator types. Firefox is the only browser that implements this correctly.

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