Content-Type does the client accept.
|MIMEType||The first half of the mime type. This can also be a |
|MIMESubtype||The second half of the mime type or a * for all sub types (ie |
|QualityFactor||The quality factor in the format |
The content types are MIME types (ie
text/html) separated by comma with an optional quality factor (using a
;q=) that is
used the clients preference for using this type. The quality factor has a value from 0 to 1 with the higher the number the more preference for that type.
If the server can't find an acceptable type to reply with then it should send a 406 (not acceptable) response.