Nginx conditionally rewrite uri

Question

I use nginx as a reverse proxy for multiple Rails apps (using Nixy). I need to rewrite some requests to inject a string in front of url, if is missing.

For example: If I have http://proxy_ip/app_name/some/root I don't want to modify anything, but if I have http://proxy_ip/some/root I want to transform in http://proxy_ip/app_name/some/root

I tried rewrite ^ /app_name/$uri; but it doesn't work, and I have no idea how to conditionally do that rewrite.

Searching for your exact title turns up many hits right here on SO, have you tried any of the approaches described in any of them? [Example](https://stackoverflow.com/questions/45526436/nginx-conditional-rewrite-issue), [another example](https://stackoverflow.com/questions/40181475/nginx-conditional-redirect-to-https). — Don't Panic, Oct 23 '19 at 09:38
Maybe https://stackoverflow.com/questions/40181475/nginx-conditional-redirect-to-https ? — AMDP, Nov 16 '19 at 23:10
You may find an if statement example here: https://stackoverflow.com/questions/40181475/nginx-conditional-redirect-to-https — AMDP, Nov 16 '19 at 23:11

score 0 · Answer 1 · answered Nov 17 '19 at 01:21

You could use a map to detect the missing app name, then return 301 with the missing app name.

map $uri $prepend_app_name {
    ~^/some/root(/.*)?$ app_name;
}

server {
    if ($prepend_app_name) {
        return 301 /$prepend_app_name$uri;
    }
    # ...
}

score -1 · Answer 2 · answered Nov 16 '19 at 23:17

-1

Look at the comments and in case try with an if statement keeping in mind what nginx documentation advices: https://www.nginx.com/resources/wiki/start/topics/depth/ifisevil/

answered Nov 16 '19 at 23:17

AMDP

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Nginx conditionally rewrite uri

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