Include Referer-HTTP-header in requests from XMLHttpRequests

Hello,

currently, there is no standard behaviour for XMLHttpRequests regarding the
Referer HTTP header - some browsers send it, others don't [see also
https://bugzilla.mozilla.org/show_bug.cgi?id=170477].

As a web developer, I would welcome it if the referer header was sent by as
many browsers as possible when using XMLHttpRequests. It helps a lot when
analyzing problems and figuring out the origin of requests.
Please include the Referer header in the specification as a recommended
header for HTTP requests generated by the XMLHttpRequest object.

Suggestion:
'HTTP requests SHOULD by default include the "Referer" HTTP header.'

This probably belongs in the description of the "send" method.

Regards,
-Sven Neuhaus