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20.12 Content-Encoding

   The Content-Encoding header field is used as a modifier to the
   "media-type".  When present, its value indicates what additional
   content codings have been applied to the entity-body, and thus what
   decoding mechanisms MUST be applied in order to obtain the media-type
   referenced by the Content-Type header field.  Content-Encoding is
   primarily used to allow a body to be compressed without losing the
   identity of its underlying media type.

   If multiple encodings have been applied to an entity-body, the
   content codings MUST be listed in the order in which they were
   applied.

   All content-coding values are case-insensitive.  IANA acts as a
   registry for content-coding value tokens.  See [H3.5] for a
   definition of the syntax for content-coding.

   Clients MAY apply content encodings to the body in requests.  A
   server MAY apply content encodings to the bodies in responses.  The
   server MUST only use encodings listed in the Accept-Encoding header
   field in the request.

   The compact form of the Content-Encoding header field is e.
   Examples:

      Content-Encoding: gzip
      e: tar

20.13 Content-Language

   See [H14.12]. Example:

      Content-Language: fr

20.14 Content-Length

   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.


      The ability to omit Content-Length simplifies the creation of
      cgi-like scripts that dynamically generate responses.

   The compact form of the header field is l.

   Examples:

      Content-Length: 349
      l: 173

20.15 Content-Type

   The Content-Type header field indicates the media type of the
   message-body sent to the recipient.  The "media-type" element is
   defined in [H3.7].  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).

   The compact form of the header field is c.

   Examples:

      Content-Type: application/sdp
      c: text/html; charset=ISO-8859-4

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