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From Nicholas Sherlock <>
Subject [users@httpd] Re: questions on TCP connections and Sessions
Date Mon, 23 Feb 2009 13:20:19 GMT
Qingshan Xie wrote:
> Hello,  
>    I am pretty confused about the TCP connections and sessions in the case of proxy server
in the middle.  Here is the case, 
>                Browser -> SSL-Proxy Server -> SSL WebServer
> there are two parts in this SSL communication, 
> 1.  Browser -> SSL-Proxy Server.  Browser sends a HTTPS request, SSL-Proxy server
terminates the SSL connection.
> 2. SSL-Proxy Server -> HTTPS WebServer.  SSL-Proxy server as a client re-encrypts
the request, sends it to backend HTTPS webServer.
> How many sessions will be, one or two?  Can someone help?

The only SSL proxy I know of is a HTTP proxy that supports the CONNECT 
method. Basically, the browser connects to the proxy, sends "CONNECT" 
and the name of the host to connect to. The proxy connects to the 
webserver. The proxy relays any bytes sent from the client to the 
webserver, and vice versa. If the client closes the connection, the 
proxy disconnects from the web server, and vice versa. The only thing 
that the proxy gets to see is the call to "CONNECT", everything else it 
cannot view because it is encrypted and it does not have the key.

Nicholas Sherlock

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