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From "Chirouze Olivier" <>
Subject [users@httpd] RE: Proxy & virtual host information [was: Status page: reading state]
Date Wed, 07 Feb 2007 16:49:05 GMT
Hi Olivier,

Thanks for your VERY INTERESTING question :-)

Here's more:
I activated debug logging and it really seems when proxying the request,
nothing happens until the whole app server response is received by the
reverse proxy.
Here's the log when accessing a page that just waits 10 seconds. The
mod_proxy sees that we are working with this specific virtual host, but
not "the rest of apache"...

[Wed Feb 07 17:36:18 2007] [debug] proxy_http.c(67): proxy: HTTP:
canonicalising URL //internalappserver/veryslowpage
[Wed Feb 07 17:36:18 2007] [debug] mod_proxy.c(454): Trying to run
[Wed Feb 07 17:36:18 2007] [debug] proxy_http.c(1697): proxy: HTTP:
serving URL http://internalappserver/veryslowpage
[Wed Feb 07 17:36:18 2007] [debug] proxy_http.c(186): proxy: HTTP
connecting http://internalappserver/veryslowpage to internalappserver:80
[Wed Feb 07 17:36:18 2007] [debug] proxy_util.c(1139): proxy: HTTP: fam
2 socket created to connect to internalappserver
[Wed Feb 07 17:36:18 2007] [debug] proxy_http.c(336): proxy: socket is
[Wed Feb 07 17:36:18 2007] [debug] proxy_http.c(370): proxy: connection
complete to internalappserver:80 (internalappserver)
[Wed Feb 07 17:36:18 2007] [debug] proxy_http.c(1531): proxy: start body
[Wed Feb 07 17:36:28 2007] [debug] proxy_http.c(1591): proxy: end body

It's only after 10 seconds that the virtual host name appears in the
status page.

I'm starting to understand this is a normal behaviour of "handlers" (one
and then the other, then the next one...).
But I keep thinking something's wrong...

Or is it possible to change the order of handlers??


> -----Original Message-----
> From: Chirouze Olivier 
> Sent: 07 February 2007 16:07
> To: ''
> Subject: Proxy & virtual host information [was: Status page: 
> reading state]
> Hi
> This is the following of an existing thread I originaly 
> posted, but I have more details. I will describe the problem 
> more precisely, hopping this time, someone will give some help ;-)
> Let say you have a very complicated page (or just a buggy app 
> :-) published on an app server (on local network).
> You access the app server through Apache running as a reverse 
> proxy, using a virtual host.
> Here's how my test config looks like:
> --------------------------------------------------------------
> -----------------
> <VirtualHost ip:80>
> ServerName
> RewriteEngine   on
> RewriteRule     ^/(.*)$ http://internalappserver/veryslowpage
> ProxyRequests   off
> </VirtualHost>
> --------------------------------------------------------------
> -----------------
> With this configuration, a call to 
> will work as expected, as the 
> request will be forwarded to 
> http://internalappserver/veryslowpage and you'll see a 
> process with "" as virtual host on the 
> status page, handled in less than a second (the connection 
> becomes free as soon as it has been forwarded to the app server).
> The thing is, the request will be _redirected_ to 
> http://internalappserver/veryslowpage (the user sees 
> http://internalappserver/veryslowpage in his address bar), 
> which is something we don't want for a "proper" reverse 
> proxy: we want the user to see only the reverse proxy.
> For that, you'll need to add the [P] flag at the end of the 
> RewriteRule line:
> --------------------------------------------------------------
> -----------------
> RewriteRule     ^/(.*)$ http://internalappserver/verybigdownload [P]
> --------------------------------------------------------------
> -----------------
> As far as I know that's what makes it being "proxied", 
> hidding the address of the actual app server.
> As soon as you activate this, Apache will keep a connection 
> open until the app server has finished sending response. This 
> seems perfectly normal to me. What I don't understand is: why 
> the hell is this connection on state "..reading..", with no 
> virtual host associated, all this time (until the app server is done)?
> This is not just something I'm wondering about, it something 
> that makes all modules working at the virtual host level 
> become useless :-(
> I'd love to find the "bug" and fix it myself... But I'd need 
> someone to point me to the right place...
> Olivier
> Olivier CHIROUZE
> I&0 Infrastructure
> Volvo Information Technology

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