The Accept-Charset Header Field has the following syntax:

Accept-Charset = 1#(charset [weight]) / ("*" [weight])

The user agent may provide a list of Acceptable Character Sets in the Accept-Charset Header Field of the request. Its value is a comma-separated list of one or more charsets and/or the wildcard value ("*").

The values of the Accept-Charset Header Field values are prioritized by their weight parameter.

If no wildcard ("*") is present, then any character sets not explicitly mentioned in the Header Field are considered "not acceptable" to the client.

If the Media Type defines a "charset" parameter, it shall be included with the Media Type in the Accept Header Field, rather than in the Accept-Charset Header Field.