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RE: Proxy and HTTP protocol versions

From: Joris Dobbelsteen <joris.dobbelsteen@mail.com>
Date: Sat, 7 Jun 2003 17:29:47 +0200
To: "'Sudha Subramanian'" <ssudhaiyer@hotmail.com>, <ietf-http-wg@w3.org>
Message-ID: <000501c32d09$a1da26d0$0d0ca8c0@joris2k.local>

Proxy-Connection is not HTTP standard. It is generally used by HTTP/1.0 to
distinguish between the connection of the proxy to the client and the proxy to
the server.

Making a simple proxy might be harder than you expect:
Just ensure this:
* Each request requires a new connection. This will solve some problems for you.

To do this you must ensure you send:
* Connection: Close
upstream and downstream (HTTP/1.1)

For compatibility you must send
* Proxy-connection: Close
downstream (unless communicating with a upstream proxy).

Generally I would recommend to get all this connection-specific stuff out of the
way:
Replace "Connection" with above upstream and downstream.
Also you should remove "Proxy-*" from the request upstream.
  Might want to consider Proxy-Authentication, etc...


Note that when any client closes the connection, the other one should be closed
also.


- Joris

>-----Original Message-----
>From: ietf-http-wg-request@w3.org
>[mailto:ietf-http-wg-request@w3.org]On
>Behalf Of Sudha Subramanian
>Sent: Saturday, 7 June 2003 4:25
>To: ietf-http-wg@w3.org
>Subject: Proxy and HTTP protocol versions
>
>Hi,
>
>I'm trying to implement a proxy server. The proxy server does
>nothing but
>just forwards the request to the destination server.
>
>My question is:
>
>1. For implementing a proxy as simple as this ( just forward
>request back
>and forth), do I have to bother myself with the HTTP protocol
>versions etc.
>
>2. I understand from a bit of googling  that I should be removing the
>'Proxy-Connection' from the request header so that we won't
>have to worry
>about a broken link even if the upstream proxy does not
>support it. Is there
>anyother field like this that I should deal with ?  Does this
>apply to both
>HTTP 1.0 as well as HTTP 1.1 ?
>
>Any help or pointers would be of great help.
>
>-Thanks
>Sub
>
>_________________________________________________________________
>Go down memory lane. Revisit the cool times.
>http://www.batchmates.com/msn.asp Reconnect with old friends!
>
>
Received on Saturday, 7 June 2003 11:26:51 GMT

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