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An Internet media type is, generally speaking, a property of a data set, describing both the general type of data (such as "text" or "image" or "application"; the last one refers to program-specific internal data formats) and, as a subtype, a specific format for the data. The concept was originally defined as "MIME content types".
Media types relate to HTML as follows:
text/html) in the HTTP headers it sends along with the document. Normally servers are configured to do this by default when the file name ends with
.htm(depending on the system; please consult local documentation).
.zipto media type
application/zip), and it may provide users some tools for overriding such mappings or otherwise specifying the media type to be associated with a file or set of files. The description of the A element contains some additional notes related to audio and video and binary files in general.
HTML 3.2 Reference Specification
refers to RFC 1521
but that specification was superseded by
(in November 1996).
The procedure for registering types in given in
it, the registry is kept at
For less authoritative but more readably presented information, see document MIME Types by Chris Herborth.
In addition to standardized media types, there are media types which are in fact supported by popular servers and browsers. Appendix B of Special Edition Using CGI lists many of them.
You can check what is the media type information sent by a server
Assuming we are interested in the media type of the document at
a Telnet connection to host
using the port number in the URL if present, port 80 otherwise.
Then give the command
and then an empty line. Example (where the Telnet connection is established by starting the
telnet program from Unix command level):
beta ~ 51 % telnet www.hut.fi 80 Trying 18.104.22.168... Connected to info-e.hut.fi. Escape character is '^]'. HEAD /home/jkorpela/perhe.jpg HTTP/1.0 HTTP/1.1 200 OK Date: Tue, 23 Sep 1997 12:37:05 GMT Server: Apache/1.2.4 Last-Modified: Tue, 08 Aug 1995 08:29:53 GMT ETag: "16391-9232-30272081" Content-Length: 37426 Accept-Ranges: bytes Connection: close Content-Type: image/jpeg Connection closed by foreign host. beta ~ 52 % exitHere the
Content-Type:field tells that the media type is