Form HTTP Extensions

Dear all,

I am about to submit an email to public-html-admin requesting the
publication of an extension specification for Form HTTP Extensions. Prior
to this and minting a FPWD snapshot i would like to initiate this thread
for any further technical discussion over the specification. The current
editor's draft resides here:

http://cameronjones.github.io/form-http-extensions/index.html

The extension specification resolves the previously tracked "ISSUE-195:
Enhance http request generation from forms":

http://www.w3.org/html/wg/tracker/issues/195

In summary, the extension amount to the following changes:

    * Remove restrictions on form HTTP methods to allow for PUT and DELETE
methods, in addition to HTTP extension-methods for private\experimental use
under CORS restrictions.
    * Introduce @payload submission attribute on form controls allowing
targeting URL queries, HTTP headers and message data from user input or
hidden fields.
    * Extends the use of named form control fields to include "_username_"
and "_password_" for integration with User Agent HTTP Authentication, akin
to XHR open() method arguments.
    * Additional "_logout_" named form control field for initiating
clearing of User Agent HTTP Authentication Cache defined by RFC2617
"protection space".

The following is a list of additional references with further discussion
and/or information:

http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2013-February/208357.html
http://lists.w3.org/Archives/Public/public-html/2013Feb/0227.html

Feedback is most welcome!

Thanks,
Cameron Jones