Quoted string parameters

[zmthy]

According to RFC 7231, parameter values can be quoted, and the quoted form should be considered equivalent to the unquoted form.

A parameter value that matches the token production can be transmitted either as a token or within a quoted-string. The quoted and unquoted values are equivalent. For example, the following examples are all equivalent, but the first is preferred for consistency:

text/html;charset=utf-8
text/html;charset=UTF-8
Text/HTML;Charset="utf-8"
text/html; charset="utf-8"

RFC 7230 defines the syntax of quoted-string.