Ns_ConnSetHeaders(3aolserver)				   AOLserver Library Procedures 			     Ns_ConnSetHeaders(3aolserver)

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NAME

       Ns_ConnCondSetHeaders,  Ns_ConnSetExpiresHeader,  Ns_ConnSetHeaders,  Ns_ConnSetLastModifiedHeader,  Ns_ConnSetLengthHeader,  Ns_ConnSetRe-
       quiredHeaders - Routines to manage response headers

SYNOPSIS

       #include "ns.h"

       void
       Ns_ConnCondSetHeaders(conn, key, value)

       void
       Ns_ConnSetExpiresHeader(conn, expires)

       void
       Ns_ConnSetHeaders(conn, key, value)

       void
       Ns_ConnSetLastModifiedHeader(conn, mtime)

       void
       Ns_ConnSetLengthHeader(conn, length)

       void
       Ns_ConnSetRequiredHeaders(conn, type, length)

       void
       Ns_ConnSetTypeHeader(conn, type)

ARGUMENTS

       Ns_Conn	 conn	(in)	  Pointer to open connection.

       char	 *expires(in)	  Pointer to string to construct an expires header.

       char	 *key	(in)	  Pointer to string key for a header.

       int	 length (in)	  Integer length of output content to construct a content-length header.

       time_t	 mtime	(in)	  Modification time stamp to construct a last-modified header.

       int	 status (in)	  HTTP result status code.

       char	 *type	(in)	  Pointer to mimetype string to construct a content-type header.

       char	 *value (in)	  Pointer to a string value for a header.
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DESCRIPTION

       These functions manage the output headers eventually sent through the given open connection to a client.  They  operate	by  modifying  the
       outputheaders  Ns_Set  of the connection Ns_Conn structure.  Headers can be modified until they are queued or sent directly via the Ns_Con-
       nQueueHeaders or Ns_ConnFlushHeaders routines.  It is possible to modify the outputheaders directly although use of these functions is pre-
       ferred for consistancy.

       Note  that higher level output routines such as Ns_ConnFlush or the various Ns_ConnReturn routines normally generate all the headers neces-
       sary for a given response.  These routines are normally only necessary for specialized applications which output additional specific  head-
       ers or specialized request procedures which do not use the higher level output routines.

       void Ns_ConnCondSetHeaders(conn, key, value)
	      Append an output header of the form key: value only if the header does not already exist in the outputheaders set.

       void Ns_ConnSetExpiresHeader(conn, expires)
	      This  routine  is equivalent to Ns_ConnSetHeaders(conn, "Expires", expires).  Note that the exires parameter is treated as a string,
	      not a timestamp.	A timestamp can be constructed with the Ns_HttpTime routine.

       void Ns_ConnSetHeaders(conn, key, value)
	      Append a header of the form key: value to the outputheaders.  This routine will append a new, possibly duplicate, header	regardless
	      of whether a matching header already exists in the outputheaders.

       void Ns_ConnSetLastModifiedHeader(conn, mtime)
	      This  routine appends a last-modified header if one does not already exists, formatting the given modification time as a proper HTTP
	      timestamp with the Ns_HttpTime routine.

       void Ns_ConnSetLengthHeader(conn, length)
	      This routine appends a content-length: length header, formatting the given integer length as  a  string.	 This  routine	will  also
	      record the response length internally in the conn structure so that it can be later retrieved via the Ns_ConnResponseLength routine,
	      for example, as part of a post-connection logging callback.

       void Ns_ConnSetRequiredHeaders(conn, type, length)
	      This routine appends the basic headers normally required for a proper HTTP  transaction.	 These	include  mime-version,	date,  and
	      server  as  well as the content-type: type and content-length: length headers for the given arguments.  If type is NULL or length is
	      less than zero, the corresponding headers will not be appended.  This routine is often the only header construction  routine  neces-
	      sary  for  request  procedures which construct headers manually instead of calling routines such as Ns_ConnFlush which handle header
	      construction and queueing automatically.

       void Ns_ConnSetTypeHeader(conn, type)
	      This routine is equivalent to Ns_ConnSetHeaders(conn, "content-type", type).

SEE ALSO

       Ns_ConnQueueHeaders(3), Ns_ConnFlushHeaders(3), Ns_ConnFlush(3)

KEYWORDS

       headers, response

AOLserver								4.0					     Ns_ConnSetHeaders(3aolserver)