AFAIK you can't use variables of captured groups when using sockets,
but I don't have an answer to why. To check If I'm correct you could
try using a tcp port instead of socket.
2017-08-31 18:06 GMT+02:00 David Mugnai <dvd@xxxxxx>:
> Excerpts from Luca Toscano's message of agosto 31, 2017 1:55 :
>
>> Hi David,
>>
>> 2017-08-29 17:41 GMT+02:00 David Mugnai <dvd@xxxxxx>:
>>
>>> 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)
>
> up to trace8 :) unfortunately nothing relevant ends into the logs.
> I can see mod_rewrite doing its work but nothing about the 400
>
>> 2) Have you tried
>> https://httpd.apache.org/docs/2.4/mod/mod_proxy.html#proxypassmatch ?
>
> Correct me if I am wrong, but ProxyPassMatch cannot match against the
> hostname, isn't it?
>
> David
>
>
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--
Daniel Ferradal
IT Specialist
email dferradal at gmail.com
linkedin es.linkedin.com/in/danielferradal
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