https://en.wikipedia.org/wiki/MIME
Started with SMTP but used by HTTP
servers insert a MIME header field at the beginning of any Web transmission.
Clients use the content type or media type header to select an appropriate viewer application for the type of data indicated.
List of MIME: http://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types
| content-type header | |
|---|---|