[Webkit-unassigned] [Bug 162819] New: Web Inspector: provide more information about CORS errors

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=162819

            Bug ID: 162819
           Summary: Web Inspector: provide more information about CORS
                    errors
    Classification: Unclassified
           Product: WebKit
           Version: Safari 10
          Hardware: Macintosh
                OS: All
            Status: NEW
          Severity: Enhancement
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rendezvouscp at gmail.com
                CC: bburg at apple.com, joepeck at webkit.org,
                    mattbaker at apple.com, nvasilyev at apple.com,
                    timothy at apple.com, webkit-bug-importer at group.apple.com

While writing a script that makes an XHR across domains, I ran into an issue where the server was responding with multiple Access-Control-Allow-Origin headers.

Safari unhelpfully reports this error: Origin http://example.com is not allowed by Access-Control-Allow-Origin.

This doesn’t provide a lot of information about what’s going on or how to fix it.

This was fixed in Chromium a while back: https://bugs.chromium.org/p/chromium/issues/detail?id=321517

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