The Content-Type header field indicates the media type of the message-body sent to the recipient. The Content-Type header field MUST be present if the body is not empty. If the body is empty, and a Content-Type header field is present, it indicates that the body of the specific type has zero length (for example, an empty audio file).
For Example:
Content-Type: application/sdp
@see ContentDispositionHeader
@see ContentLengthHeader
@see ContentEncodingHeader
@see ContentLanguageHeader
@author BEA Systems, NIST
@version 1.2