Bug 212850 – Web Inspector: XHR request with same URL as main resource will hide the main resource request

• Component: Web Inspector
• Status: RESOLVED FIXED

[Devin Rousso]

# STEPS TO REPRODUCE
1. inspect <https://webkit.org>
2. evaluate `var xhr = new XMLHttpRequest(); xhr.open('POST', location.href, true); xhr.send();` in the Console
 => icon of main resource in Sources Tab changes to match XHR, but no new resource is shown
3. repeat step 2
 => new resource appears, but main resource still shows incorrectly

[Devin Rousso]

Created attachment 401208 [details]
Patch

[Devin Rousso]

<rdar://problem/33072149>

[Devin Rousso]

Comment on attachment 401208 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=401208&action=review

> Source/WebInspectorUI/UserInterface/Controllers/NetworkManager.js:-975
> -            // This is a new request for an existing frame, which might be the main resource or a new resource.
> -            if (resourceOptions.type === "Document" && frame.mainResource.url === url && frame.loaderIdentifier === resourceOptions.loaderIdentifier)
> -                resource = frame.mainResource;

I personally think that this is possibly a scary change, but at the same time I do think that this code is somewhat nonsensical, and my own local testing from browsing around the web didn't see any impact AFAICT.

[Blaze Burg]

Comment on attachment 401208 [details]
Patch

Can a test be written for this behavior? It seems not specific to the UI.

[Devin Rousso]

Created attachment 401477 [details]
Patch

[Blaze Burg]

Comment on attachment 401477 [details]
Patch

r=me, thank you

[EWS]

Committed r262842: <https://trac.webkit.org/changeset/262842>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 401477 [details].