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==Server-Driven Negotiation==
 
This is a proposal for server-driven negotation of RSS content using the HTTP 1.1 Accept header.  The header specifies which feed formats are acceptable to a given client, based on a combination of media type and module support.  

The <tt>Accept</tt> request-header can be used to specify certain media types which are acceptable for the response.  Any XML-based media that supports modularization is supported as a media type.  Refer to the [http://www.w3.org/Protocols/rfc2616/rfc2616.html HTTP 1.1 specification] for details on [http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html Accept header].

The <tt>m</tt> accept-parameter indicates which modules are acceptable for a given media type. The parameter contains a space-separated set of URIs.  Each URI refers to a public identifier, typically the primary namespace, of a feed module to accept.  The client will accept ANY of the specified modules.  

If the <tt>Accept</tt> header is not specified then the response behavior is undefined. If the <tt>m</tt> accept-parameter is not specified then the set of accepted modules is undefined.

The degree of support by the server for the acceptable modules SHOULD bear on the quality measure.  A measurement that is sensitive to module compatibility enables the acceptance of alternative modules.  The quality measure SHOULD be less than 1.0 if any modules are not supported.

==Examples==

Here is a typical case where alternative modules can be accepted by the user-agent.

<pre>
GET /feed.ashx HTTP/1.1
Accept: application/atom+xml; q=1.0; m="http://search.yahoo.com/mrss/ http://www.microsoft.com/schemas/rss/core/2005", application/rss+xml; q=0.7; m="http://www.itunes.com/dtds/podcast-1.0.dtd http://www.microsoft.com/schemas/rss/core/2005" 
</pre>

Verbally, this would be interpreted as "I prefer Atom with [http://search.yahoo.com/mrss Yahoo Media] and [http://msdn.microsoft.com/XML/rss/sle/default.aspx SLX], but send me RSS with [http://www.apple.com/itunes/podcasts/techspecs.html iTunes] and [http://msdn.microsoft.com/XML/rss/sle/default.aspx SLX] if it is the best available after a 30% mark-down in quality (indicating, for example, a lack of support for Yahoo media)."

==Version History==
0.1 - [http://spaces.msn.com/ewright/blog/cns!C0C3DF24CE16DC2F!139.entry Initial Proposal]

0.2 - Specified the behavior when 'Accept' header or 'm' accept-parameter is not present.

Return to RSS Content Negotiation.

Retrieved from "http://rss-extensions.org/wiki/RSS_Content_Negotiation"

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