Hi!
Here is what the current XHR draft says about Content-Type of the
request:
Scripts should specify the Content-Type header via setRequestHeader
before invoking
send() with an argument.
Is invoking send() without an argument really a special case where
scripts do not need to use setRequestHeader()? I'm pretty sure that many
servers will look at Content-Type first, and reject a request if it's
incorrect, even if there is no data.
If the argument to send() is a Document and no Content-Type
header has been set user agents must set it to application/xml for XML
documents and
to the most appropriate media type for other documents (using
intrinsic knowledge about
the document).
What are the examples of how this intrinsic knowledge can be used? It
is not clear how to achieve interoperability here without a precise list
of cases. Also, what is the default Content-Type for string arguments?
Firefox just defaults to "application/xml" for any data
<http://lxr.mozilla.org/seamonkey/source/content/base/src/nsXMLHttpRequest.cpp#1616>,
and so do nightly builds of WebKit.
- WBR, Alexey Proskuryakov.
