MIME types Mail Extensions

The introduction of this header was a significant step in making it possible for a browser to successfully handle files of any type. There still remains the problem, however, of defining a set of values for the header that can identify the type of any Internet document. Fortunately, a naming scheme for document types was defined in RFC 1521, which describes a mechanism known as Multimedia Internet Mail Extensions (MIME). This proposal set up a central registry of document types for the Internet. This scheme is sufficient for indicating the type of any document transmitted using HTTP, and therefore the Content-lype header of a document is set to its MIME type. An example of a Content-Type header is ... 

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