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Re: XMLHttpRequest. Support for "OPTIONS *" method.

From: Anne van Kesteren <annevk@annevk.nl>
Date: Fri, 5 Sep 2014 10:03:46 +0200
Message-ID: <CADnb78gZ_ws5CAki-od3_5q6jPqYTw4x3qB3dGrKY7pBYAKGkQ@mail.gmail.com>
To: Mark Nottingham <mnot@mnot.net>
Cc: Валерий Котов <kotov.valery@gmail.com>, WebApps WG <public-webapps@w3.org>, WebAppSec WG <public-webappsec@w3.org>
On Thu, Sep 4, 2014 at 11:09 PM, Mark Nottingham <mnot@mnot.net> wrote:
> Huh?
> OPTIONS * isn’t exactly common, but it’s very much OK by HTTP…

Sure. It's not supported by XMLHttpRequest. If you pass "*" as URL
argument, you'll get a request for "/baseURL/*". And since it's not
supported by XMLHttpRequest, servers might not anticipate a browser to
issue such a request and therefore be vulnerable in some way.

We could definitely add a new step to
http://xhr.spec.whatwg.org/#dom-xmlhttprequest-open between 5 and 6 to
not parse the url parameter if it is "*" and normalized method is

Added WebAppSec, perhaps they can offer some insight into whether this
is feasible.

Received on Friday, 5 September 2014 08:04:14 UTC

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