[Webkit-unassigned] [Bug 58797] New: Vary header and Conditional HTTP request error

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=58797

           Summary: Vary header and Conditional HTTP request error
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: psadauskas at gmail.com


What steps will reproduce the problem?

1. Have a resource that accepts multiple representations (json/html), includes `Accept` in the `Vary` response header, and handles conditional requests with `If-Modified-Since`
2. Have Safari visit the resource, first with a modified Accept header (json), then with its normal header.

What is the expected result?

A 200 OK response from the server for the second request.

What happens instead?

A 304 Not Modified response to the second request, because Safari includes both `If-Modified-Since` and `If-None-Match` in the request, even though the `Vary: Accept` response header indicates the altered Accept header should result in a different response. The end-user effect of this is that Safari downloads the json file on the second request, rather than rendering the html.

Please provide any additional information below. 

tcpdump output of Chrome/Safari vs Firefox: https://gist.github.com/925714

Cross-posted to the chromium bug tracker: http://code.google.com/p/chromium/issues/detail?id=79758

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