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From Luca Toscano <toscano.l...@gmail.com>
Subject Re: [users@httpd] mod_rewrite + proxy + unix socket results in 400 bad request
Date Thu, 31 Aug 2017 11:55:36 GMT
Hi David,

2017-08-29 17:41 GMT+02:00 David Mugnai <dvd@gnx.it>:

> Hi,
>
> I'm trying to configure a virtual host that, based on the host name,
> forwards the request on a backend server listening on an unix socket.
>
> My apache version is 2.4.18 as shipped by Ubuntu 16.04
>
> The configuration I've tried so far is:
>
> <VirtualHost *:80>
>        ServerAdmin webmaster@localhost
>        DocumentRoot /var/www/html
>        LogLevel trace2
>
>        UseCanonicalName Off
>
>        RewriteEngine On
>        RewriteCond %{HTTP_HOST} ^(.+)\.example.com
>        RewriteRule "(.*)" "unix:/home/user/%1/server.sock|http://127.0.0.1$1
> [P,NE]
>
>        ErrorLog ${APACHE_LOG_DIR}/error.log
>        CustomLog ${APACHE_LOG_DIR}/access.log combined
> </VirtualHost>
>
> The rewrite module works as expected (in the log file I can see the full
> path to the unix socket), but trying to access the web server results in
> a "400 Bad Request" *without* the involvment of the backend server.
>
> I made a test with ProxyPass directive, and it works, but obviously is
> not what I want:
>
> <VirtualHost *:80>
>        ServerAdmin webmaster@localhost
>        DocumentRoot /var/www/html
>        LogLevel trace2
>
>        UseCanonicalName Off
>
>        ProxyPass / unix:/home/user/subdomain1/server.sock|
> http://127.0.0.1/
>        ProxyPassReverse / unix:/home/user/subdomain1/server.sock|
> http://127.0.0.1/
>
>        ErrorLog ${APACHE_LOG_DIR}/error.log
>        CustomLog ${APACHE_LOG_DIR}/access.log combined
> </VirtualHost>
>
> How can I fix it?
>

Didn't have much time to try this use case manually but I have a couple of
suggestions:

1) Do you find any log in the error_log that could give us some clue about
the 400 returned? (maybe increasing the LogLevel to debug or trace)
2) Have you tried
https://httpd.apache.org/docs/2.4/mod/mod_proxy.html#proxypassmatch ?

Luca

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