other means of communicating with the origin server.

   The Allow header field does not indicate what methods are implemented
   by the server.

10.2  Authorization

   A user agent that wishes to authenticate itself with a server--
   usually, but not necessarily, after receiving a 401 response--may do
   so by including an Authorization request-header field with the
   request. The Authorization field value consists of credentials
   containing the authentication information of the user agent for the
   realm of the resource being requested.

       Authorization  = "Authorization" ":" credentials

   HTTP access authentication is described in Section 11. If a request
   is authenticated and a realm specified, the same credentials should
   be valid for all other requests within this realm.

   Responses to requests containing an Authorization field are not
   cachable.








 
RFC 1945                        HTTP/1.0                        May 1996


10.3  Content-Encoding

   The Content-Encoding entity-header field is used as a modifier to the
   media-type. When present, its value indicates what additional content
   coding has been applied to the resource, and thus what decoding
   mechanism must be applied in order to obtain the media-type
   referenced by the Content-Type header field. The Content-Encoding is
   primarily used to allow a document to be compressed without losing
   the identity of its underlying media type.

       Content-Encoding = "Content-Encoding" ":" content-coding

   Content codings are defined in Section 3.5. An example of its use is

       Content-Encoding: x-gzip

   The Content-Encoding is a characteristic of the resource identified
   by the Request-URI. Typically, the resource is stored with this
   encoding and is only decoded before rendering or analogous usage.

10.4  Content-Length

   The Content-Length entity-header field indicates the size of the
   Entity-Body, in decimal number of octets, sent to the recipient or,
   in the case of the HEAD method, the size of the Entity-Body that
   would have been sent had the request been a GET.

       Content-Length = "Content-Length" ":" 1*DIGIT

   An example is

       Content-Length: 3495

   Applications should use this field to indicate the size of the
   Entity-Body to be transferred, regardless of the media type of the
   entity. A valid Content-Length field value is required on all
   HTTP/1.0 request messages containing an entity body.

   Any Content-Length greater than or equal to zero is a valid value.
   Section 7.2.2 describes how to determine the length of a response
   entity body if a Content-Length is not given.

      Note: The meaning of this field is significantly different from
      the corresponding definition in MIME, where it is an optional
      field used within the "message/external-body" content-type. In
      HTTP, it should be used whenever the entity's length can be
      determined prior to being transferred.





 
RFC 1945                        HTTP/1.0                        May 1996


10.5  Content-Type

   The Content-Type entity-header field indicates the media type of the
   Entity-Body sent to the recipient or, in the case of the HEAD method,
   the media type that would have been sent had the request been a GET.

       Content-Type   = "Content-Type" ":" media-type

   Media types are defined in Section 3.6. An example of the field is