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mod_rewrite as reverse proxy not working with post method ...

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dourix

dourix

MIS
Mar 17, 2004
9
LR

Hi guys,

I've seen this question asked several times but did not find any solution yet :-/

I'm trying to setup a reverse proxy with ProxyPass/ProxyReverse and with mod_rewrite, but both *don't work* when the proxied host uses a HTTP POST method, in which case it is redirecting instead of proxying.

Any solution ? any tips ?

--
DouRiX
 
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Can you post your actual code? We do about 4 million+ post proxy's a day without incident.

 
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with ProxyPass/ProxyReverse :

ProxyRequests off
ProxyPass / ProxyPassReverse /
and with mod_rewrite :

RewriteRule ^/(.*) [P]
RewriteCond /$1 -U
RewriteRule ^ /$1

both don't work (/w apache-1.3.26 and apache-2.0.48)

According to this link : it seems just impossible with only mod_proxy/apache-1.3,

I'm interested with your working config.

Thanks,
 
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Hmm, if you use relative links you should be fine. Here is how I do my proxy's.

Code: 
RewriteRule \.(gif|jpg|png|css|txt|cgi)$ - [last]
RewriteRule ^/cgi-bin - [last]

#####
# Check for trailing slash issue
#####
RewriteCond     /[URL unfurl="true"]www/www.site.com/html/%{SCRIPT_FILENAME}[/URL]    -d
RewriteCond     %{SCRIPT_FILENAME}      ^.*[^\/]$
RewriteRule ^(.*)$ $1/ [N]
# pass off everything but images to the heavy-weight server via proxy
RewriteRule ^/(.*)$ [URL unfurl="true"]http://www-internal.site.com:801/$1[/URL] [proxy]

You can see it at work at
Plenty of POST forms there going through the reverseproxy.
 
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I don't see big differences between the rules :

<code>
RewriteRule ^/(.*)$ [proxy]

RewriteRule ^/(.*) [P]
</code>

Also I don't really understand what you mean by *relative links* ? my problem is that I can't touch the internal-site code,

I'm very curious to know why is it working for you,

Could you light more ?

Thanks,
 
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Turn on RewriteLog to level 5 and see what requests are matching. This will tell you exactly where your request is going.

Post some of the related log lines here so we can take a look.
 
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When I'm trying to proxy-reverse an imp horde site with the config below, and after the login (a post form), I am *redirected* to the actual imp url (
_config_ :

RewriteEngine on
RewriteLog /var/log/apache/mod_rewrite.log
RewriteLogLevel 5

CustomLog /var/log/apache/debug.log debug

RewriteRule ^/(.*) [P]
RewriteCond /$1 -U
RewriteRule ^ /$1

Here are the corresponding logs :

==> /var/log/apache/mod_rewrite.log <==
192.168.0.212 - - [24/Mar/2004:10:37:11 +0300] [my.proxy.com/sid#80ccac4][rid#81424cc/initial] (2) init rewrite engine with requested uri /horde/imp/redirect.php
192.168.0.212 - - [24/Mar/2004:10:37:11 +0300] [my.proxy.com/sid#80ccac4][rid#81424cc/initial] (3) applying pattern '^/(.*)' to uri '/horde/imp/redirect.php'
192.168.0.212 - - [24/Mar/2004:10:37:11 +0300] [my.proxy.com/sid#80ccac4][rid#81424cc/initial] (2) rewrite /horde/imp/redirect.php -> 192.168.0.212 - - [24/Mar/2004:10:37:11 +0300] [my.proxy.com/sid#80ccac4][rid#81424cc/initial] (2) forcing proxy-throughput with 192.168.0.212 - - [24/Mar/2004:10:37:11 +0300] [my.proxy.com/sid#80ccac4][rid#81424cc/initial] (1) go-ahead with proxy request proxy: [OK]
192.168.0.212 - - [24/Mar/2004:10:37:11 +0300] [my.proxy.com/sid#80ccac4][rid#808d1cc/initial/redir#1] (2) init rewrite engine with requested uri /horde/imp/redirect.php
192.168.0.212 - - [24/Mar/2004:10:37:11 +0300] [my.proxy.com/sid#80ccac4][rid#808d1cc/initial/redir#1] (3) applying pattern '^/(.*)' to uri '/horde/imp/redirect.php'
192.168.0.212 - - [24/Mar/2004:10:37:11 +0300] [my.proxy.com/sid#80ccac4][rid#808d1cc/initial/redir#1] (2) rewrite /horde/imp/redirect.php -> 192.168.0.212 - - [24/Mar/2004:10:37:11 +0300] [my.proxy.com/sid#80ccac4][rid#808d1cc/initial/redir#1] (2) forcing proxy-throughput with 192.168.0.212 - - [24/Mar/2004:10:37:11 +0300] [my.proxy.com/sid#80ccac4][rid#808d1cc/initial/redir#1] (1) go-ahead with proxy request proxy: [OK]

==> /var/log/apache/debug.log <==
192.168.0.212 - - [24/Mar/2004:10:37:14 +0300] "POST /horde/imp/redirect.php?Horde=05c33a73fb0d6ae1b27866809000d288 HTTP/1.1" 302 5 " "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.5) Gecko/20031115 Debian/1.5-3.he-1" 10238 3
 
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Thats horde, not mod_proxy. Horde redirects after login.

Change your horder redirect IP and you'll probably be ok.

Horde does not know that its behind a revers proxy.
 
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the problem is that the application behind behaves like horde, and i do not have control of it :-/
 
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And you won't. You can probably change the URL's horde is doing redirects with and force them to where you want them, I have to do this on other peoples apps all the time.

But this is not really a reverse proxy problem, its a horde config problem at this point.
 
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shouldn't the rule below already do it ?

Code: 
    RewriteCond /$1  -U
    RewriteRule ^[URL unfurl="true"]http://192.168.0.254/(.*)$[/URL] /$1

anyway, thanks for your answers, i'll dig more, do more tests and come back to you later,
 
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Probably not, the horde redirect is not even hitting your proxy post redirect. Thats why your logs end at :

POST /horde/imp/redirect.php?

You need to get horde to redirect out to your proxy again so you can handle it.

Anyhow, good luck, I am most likely not comprehending your problem fully.
 
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> Anyhow, good luck, I am most likely not comprehending your
> problem fully.

me neither :)

thanks,
 
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