[Webkit-unassigned] [Bug 36854] New: Body from preflighted Cross-Origin request is prepended to the actual request body

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=36854

           Summary: Body from preflighted Cross-Origin request is
                    prepended to the actual request body
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
               URL: http://jbei-exwebapp.lbl.gov/maschup/webkit_xdr_bug.ht
                    ml
        OS/Version: Mac OS X 10.5
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: hirenj at gmail.com


For a pre-flighted request (triggered for example when the X-Requested-With
header is set), any data returned by the preflight request is prepended to the
actual request data.

In the given url, a cross-domain request is triggered to a simple echo
resource. The output for this resource is static, and sets the Access control
headers to enable cross-origin requests:

curl -i 'http://131.243.44.83/maschup/webkit_xdr_bug.pl'

HTTP/1.1 200 OK
Date: Tue, 30 Mar 2010 21:34:50 GMT
Server: Apache/2.2.9 (Debian) PHP/5.2.6-1+lenny8 with Suhosin-Patch
Access-control-allow-headers: X-Requested-With
Access-control-max-age: 1728000
Access-control-allow-origin: *
Access-control-allow-methods: *
Vary: Accept-Encoding
Content-Length: 4
Content-Type: text/plain

echo

The output from this echo script is always static, and always returns the
Access-Control headers.

When a cross-domain request is triggered from within a recent webkit (i.e.
nightly webkit, or Chrome), the responseText contains the body from the
preflight request as well as the body from the actual request.

This can be seen at the page given in the URL
(http://jbei-exwebapp.lbl.gov/maschup/webkit_xdr_bug.html). 

The HTTP specifications don't seem to say what the user-agent should do with
the body of the request. Firefox (3.6.2)  returns only the body from the actual
request, and Safari (4.0.5 (5531.22.7) OS X 10.5) also returns only the body
from the actual request.

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