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Each media-range MAY be followed by one or more accept-params, beginning with the "q" parameter for indicating a relative quality factor.The first "q" parameter (if any) separates the media-range parameter(s) from the accept-params.
The media-range MAY include media type parameters that are applicable to that range.If an Accept header field is present, and if the server cannot send a response which is acceptable according to the combined Accept field value, then the server SHOULD send a 406 (not acceptable) response.A more elaborate example is Verbally, this would be interpreted as "text/html and text/x-c are the preferred media types, but if they do not exist, then send the text/x-dvi entity, and if that does not exist, send the text/plain entity." Media ranges can be overridden by more specific media ranges or specific media types.Quality factors allow the user or user agent to indicate the relative degree of preference for that media-range, using the qvalue scale from 0 to 1 (section 3.9). Note: Use of the "q" parameter name to separate media type parameters from Accept extension parameters is due to historical practice.Although this prevents any media type parameter named "q" from being used with a media range, such an event is believed to be unlikely given the lack of any "q" parameters in the IANA media type registry and the rare usage of any media type parameters in Accept.