The Content-Length header field indicates the size of the message-body, in decimal number of octets, sent to the recipient. Applications SHOULD use this field to indicate the size of the message-body to be transferred, regardless of the media type of the entity. If a stream-based protocol (such as TCP) is used as transport, the header field MUST be used.
The size of the message-body does not include the CRLF separating header fields and body. Any Content-Length greater than or equal to zero is a valid value. If no body is present in a message, then the Content-Length header field value MUST be set to zero.
@see ContentDispositionHeader
@see ContentTypeHeader
@see ContentEncodingHeader
@see ContentLanguageHeader
@author BEA Systems, NIST
@version 1.2