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[lawrence at agranat.com]

>From ipp-owner at pwg.org Fri Aug 07 19:15:20 1998
Message-ID: <35CB42EB.B9C2F677 at agranat.com>
Date: Fri, 07 Aug 1998 18:09:47 +0000
From: Scott Lawrence <lawrence at agranat.com>
Organization: Agranat Systems http://www.agranat.com/
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Subject: IPP> Host header usage in draft-ietf-ipp-ipp-scheme-00.txt
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One item in draft-ietf-ipp-ipp-scheme-00.txt that I believe is not
  consistent with HTTP/1.1 - my apologies for not noticing this
  earlier.  Discussing how to construct the HTTP headers when sending 
  via a proxy, the draft says:

>  When an IPP client sends a request via a proxy, such as
>  "myproxy.com", to an 'ipp' URL, such as
>  "ipp://myhost.com/myprinter/myqueue", it MUST open a TCP connection
>  to some port (8080 in this example) on some proxy ("myproxy.com" in
>  this example) with the following headers:
>
>     POST http://myhost.com:631/myprinter/myqueue   HTTP/1.1
>     Host: myproxy.com:8080

  The latest draft (and I don't think this language is new) for 
  HTTP/1.1 in section 14.23 Host:

>> The Host request-header field specifies the Internet host and port
>> number of the resource being requested, as obtained from the original
>> URI given by the user or referring resource

  The Host is not used to specify the proxy - the proxy is not specified
  anywhere in the headers that I can find - the client just sends the
  request there.

  The correct value for the Host header field in the example above
  would be 'myhost.com:631', which may make the example the same as 
  the one above that is direct to the IPP server - which would be right.

-- 
Scott Lawrence           Consulting Engineer      <lawrence at agranat.com>
Agranat Systems, Inc.  Embedded Web Technology   http://www.agranat.com/