[Webkit-unassigned] [Bug 125840] New: Have XHR.getResponseHeader() return null in initial ready states

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=125840

           Summary: Have XHR.getResponseHeader() return null in initial
                    ready states
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: XML
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: ap at webkit.org


Consider merging https://chromium.googlesource.com/chromium/blink/+/d201caf874a0bd6f101f517462b3cf1d8c5fce3d

Follow the XMLHttpRequest specification for getResponseHeader() and
return null if the object is in ready states {UNSENT, OPENED}.

Similarly for getAllResponseHeaders() and returning "" (the empty
string) when in these initial two ready states.

This replaces the older spec behavior of throwing InvalidStateError,
something that no other engines currently do, hence cross-browser
compatibility risk is low.

When reconciling the relevant tests, reworked these to use
js-test-{pre,post}.js instead.

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