content_type should be replaced with media_type when it refers to the "type/tree"

[Jaymon]

This affects Request and Response and probably some other places (including the RESPONSE_CONTENT_TYPE environment variable). I basically use content_type for media_type in a bunch of places and I should switch them all because I almost always mean media_type when I'm using content_type

Reading:

• https://en.wikipedia.org/wiki/Media_type
• https://datatracker.ietf.org/doc/html/rfc9110#name-content-type

[Jaymon]

Ugh, this is Content-Type abnf:

Content-Type = media-type
media-type = type "/" subtype *( OWS ";" OWS parameter )
parameter = token "=" ( token / quoted-string )

So I was wrong above. Content-Type is just the name of the http header, and its value is a media-type, and a media-type value can have the parameters on it.

More reading:

• https://stackoverflow.com/questions/9258108/whats-the-difference-between-mediatype-contenttype-and-mimetype