ajax accept quality score fix

[jonrhall]

*/* is appended to the Accept header of an ajax request that uses dataType.

For "datatype: 'json'" the Accept header is:

"Accept: application/json, text/javascript, */*"

This means every mimetype has the same quality score of 1. Some servers may use order precedence but this is not within the spec ( http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html).

The fix is simply to reduce the score of */* to below 1:

(25/09/2008 nightly - line 2730) s.accepts[ s.dataType ] + ", */*" : to s.accepts[ s.dataType ] + ", */*;q=0.8" :

[ashb]

Not sure if I should raise this as another bug or not, but I would like the option to not send the "*/*" at all.

On the subject of the ticket tho, is there a reason the code shouldn't just be s.accepts[ s.dataType ] + ', ' + s.accepts._default instead of using a hardcoded "*/*".

I will prepare a patch to this effect tomorrow

[james]

This is also a problem when trying to override the prefered type. I suggest the */* have a quality of 0.1 and the default jquery provided types have a quality of < 1 (say 0.2). This will allow the caller to override the prefered type with a higher quality.

XML has a lot of various types other than the generic "application/xml" and "text/xml", so these generic types should have a lower quality over more specific XML types provided by the calling function.

[timmywil]

Please confirm this bug is still present in jQuery 1.6b1.

[john]

In fact, it doesn't seem to be - we have "q=0.01" in Ajax now. I'll mark this as fixed in 1.5.