Apache Rewrite then Proxy Pass

Question

I have an apache server that works as a reverse proxy in our DMZ. We have an external service that posts back to a particular URL on this server. There is a need now for this service to postback to an entirely new application, but this will most likely change again in the near future as we're in a testing phase right now.

So to resolve this, I'm trying to take the incoming postback request, /smsPostback.php, and rewrite it to a new relative URL, /SMSHandler/Process. This part is working.

However defined immediately below in the config, I have a ProxyPass directive to proxy all traffic to /SMSHandler to an internal server.

These are the new lines from the apache conf file:

RewriteRule ^/smsPostback.php$ /SMSHandler/Process 
##Proxy pass smshandler
ProxyPass /SMSHandler http://172.29.61.49:8080/SMSHandler
ProxyPassReverse /SMSHandler http://172.29.61.49:8080/SMSHandler

And these are the logs from the rewrite log:

172.29.61.49 - - [24/Jan/2012:18:43:36 --0500] [test.hidden.com/sid#5eace0][rid#446b770/initial] (2) init rewrite engine with requested uri /smsPostback.php
172.29.61.49 - - [24/Jan/2012:18:43:36 --0500] [test.hidden.com/sid#5eace0][rid#446b770/initial] (3) applying pattern '^/smsPostback.php$' to uri '/smsPostback.php'
172.29.61.49 - - [24/Jan/2012:18:43:36 --0500] [test.hidden.com/sid#5eace0][rid#446b770/initial] (2) rewrite '/smsPostback.php' -> '/SMSHandler/Process'
172.29.61.49 - - [24/Jan/2012:18:43:36 --0500] [test.hidden.com/sid#5eace0][rid#446b770/initial] (2) local path result: /SMSHandler/Process
172.29.61.49 - - [24/Jan/2012:18:43:36 --0500] [test.hidden.com/sid#5eace0][rid#446b770/initial] (2) prefixed with document_root to C:/hidden.com/SMSHandler/Process
172.29.61.49 - - [24/Jan/2012:18:43:36 --0500] [test.hidden.com/sid#5eace0][rid#446b770/initial] (1) go-ahead with C:/hidden.com/SMSHandler/Process [OK]

And this is the error log entry from apache:

[Tue Jan 24 18:43:36 2012] [error] [client 172.29.61.49] File does not exist: C:/fmfacilitymaintenance.com/SMSHandler

Any thoughts as to why it never reverse proxies the request, but rather tries (and fails) to serve it locally?? Thanks!

Jon Lin · Accepted Answer · 2012-01-25 17:49:15Z

21

You need to add a PT (PassThrough) to your RewriteRule so that apache takes the rewritten URI and passes it back through the URL handling pipeline (so that mod_proxy can handle it). The rule should look like this:

RewriteRule ^/smsPostback.php$ /SMSHandler/Process [L,PT]

answered Jan 25, 2012 at 17:49

Jon Lin

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3 Comments

oberhamsi Over a year ago

you can drop the Last, it's implied with Passthrough httpd.apache.org/docs/2.2/rewrite/flags.html#flag_pt

Adam Tuttle Over a year ago

Is this possible if the rewrite rules are contained in an .htaccess file? It seems like my requests are being handled by the proxy first, and then the server that handles the proxied requests doesn't care about the .htaccess file. Unfortunately I need to keep the rules contained in that file for biz-rule reasons.

nimai Over a year ago

@AdamTuttle with .htaccess, the matched path is considered relative to the current directory and it doesn't contain the leading "/". Therefore you cannot match on it.

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