Also checks mediatype suffix for lexer in HttpLexer
Also checks mediatype suffix for lexer in HttpLexer

The HttpLexer will highlight the body if the Content-Type header is set to a
mediatype that pygments understands. However, some mediatypes have a custom
subtype but a standard and known suffix. Therefore, pygments should highlight
body by the exact media type first and then by the suffix if there was no
match.

For example:

application/vnd.custom+json

currently does not result in the body being highlighted even though pygments is
capable

application/json

aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments