IPP> Connection Maintenance in IPP

IPP> Connection Maintenance in IPP

IPP> Connection Maintenance in IPP

Scott Lawrence lawrence at agranat.com
Thu Jul 3 08:39:34 EDT 1997


>>>>> "RT" == Randy Turner <rturner at sharplabs.com> writes:


RT> In its current incarnation, IPP relies on HTTP 1.1, which by default
RT> maintains persistent TCP connections between HTTP client and HTTP
RT> server.


RT> With persistent connections a client can make as many requests and
RT> receive as many responses as it wishes prior to the closing the
RT> connection. NOTE: the server or the client may elect to close a
RT> connection so both client and server should be prepared to handle
RT> an unexpected connection close operation.


  To expand on that just a little...


  Either side may indicate that a connection is closing so that the
  close need not be unexpected.  The client may send


    Connection: close


  in a request to indicate that the server should close the connection
  after sending the response, or the server may send the same header
  in a response to indicate that the connection will be closed after
  this response and so may not be used for the next request.


  In the absence of the 'Connection: close' header, the connection
  should remain open (though if idle it may be closed by either side
  after some timeout).


  HTTP/1.1 shouldn't maintain lots of connections to the same server
  (and there is little or no benefit in doing so as a rule); from the
  spec:


    Clients that use persistent connections SHOULD limit the number of
    simultaneous connections that they maintain to a given server. A
    single-user client SHOULD maintain AT MOST 2 connections with any
    server or proxy.





--
Scott Lawrence           EmWeb Embedded Server       <lawrence at agranat.com>
Agranat Systems, Inc.        Engineering            http://www.agranat.com/




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