Thanks guys for your help.
Think I may not describe my question clearly. My question is, in the case of Timeout=5 min but ProxyTimeout=10 min in a Reverse Proxy Server, if the backend response is over 10 min, when the connection will be closed, 5 min or 10 min?
Thanks again.
Q.Xie
----- Original Message ----
From: André Warnier <aw@xxxxxxxxxx>
To: users@xxxxxxxxxxxxxxxx
Sent: Wednesday, August 19, 2009 2:00:26 PM
Subject: Re: ProxyTimeout
Qingshan Xie wrote:
> Thanks for your quick reply.
> I am wondering what will happen in the case below,
> Timeout ProxyTimout
> browser <===========> proxy <===============> backend
>
> Timeout = 300 sec and ProxyTimeout = 600 sec,
> If backend process longer than 5 min, what will happen?
>> From the observation of my server, the whole HTTP session won't be terminated till 10 min. I am not sure why since the front connection should be terminated in 5 min?
>
I am not entirely sure, since I have not examined the Apache code itself, but in my understanding, the "Timeout" parameter, precisely and only, applies when Apache is waiting for something from the browser, and the browser is not sending it.
For example :
- the browser creates a TCP connection to the Apache server, on port 80.
- Apache accepts this TCP connection
- Apache now waits for the browser to send a request over that connection
- the browser, for whatever reason, is not sending the request (or not a complete request), within "Timeout" seconds
Then the Timeout applies. Apache will close the connection, because it is not getting the expected request over that connection.
This avoids a kind of DOS attack, whereby clients could open many connections to Apache, then not send any request, blocking Apache forever.
So it does /not/ apply when it is Apache that should send something to the browser, and does not send it. In that last case, what may happen is that /the browser/ times out, because Apache takes too long to respond. In my experience, this browser timeout is several minutes (3..5 ?). I don't know if this timeout is adjustable in the usual browsers.
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