Redirection in nginx

Question

I'm very new to nginx and hit the wall configuring simple redirection. Here is my very simple config trying redirection:

server { listen 80 default_server; set $mobile "false"; if ($http_user_agent ~* '(phone|droid)') { set $mobile "true"; } if ($mobile = true) { return 301 http://X.X.X.X/mobile$request_uri; } location /mobile { include uwsgi_params; uwsgi_pass unix:/var/www/video_m/video.sock; } location / { include uwsgi_params; uwsgi_pass unix:/var/www/video/video.sock; } }

When go to site from desktop everything is ok and my request is going to uwsgi. But from mobile device I get an error from browser ERR_TOO_MANY_REDIRECTS and request url looks like http://X.X.X.X/mobile/mobile/mobile/mobile/mobile/mobile/mobile/mobile

There is obviously something essential and possibly very simple piece that I missing. Please help me out.

Try 'break;' in the if blocks - just below the set $mobile "true"; — Nabeel Ahmed
– Nabeel Ahmed, Commented Jan 20, 2016 at 14:04

Richard Smith · Accepted Answer · 2016-01-20 13:49:07Z

You have created a loop. The first time it hits the if/return a /mobile prefix is added. Then the URI is presented again and it hits the same statement adding another /mobile prefix, and this continues to be repeated.

To break the loop, you need to protect the if/return within a path that is not taken once the /mobile prefix is added the first time.

Maybe:

server { listen 80 default_server; location /mobile { include uwsgi_params; uwsgi_pass unix:/var/www/video_m/video.sock; } location / { if ($http_user_agent ~* '(phone|droid)') { return 301 $scheme://$host/mobile$request_uri; } include uwsgi_params; uwsgi_pass unix:/var/www/video/video.sock; } }

Thank you. I did not know that after adding a prefix the request evaluates again from the beginning.

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