proxy_pass and trailing / decode uri

[Maxim Dounin]

Hello!

On Thu, Mar 08, 2018 at 10:34:36PM +0100, max wrote:

> Sorry if it was already asked but I'd like to know if the only way to
> prevent Nginx from decoding uri while using proxy_pass is:
> https://stackoverflow.com/a/37584656/3515745
> 
> Here is my (simplified) conf:
> 
> server {
>     server_name domain1.com;
> 
>     location / {
>         proxy_pass http://127.0.0.1:81;
> 
>      }
> 
>     location /api {
>         proxy_pass http://127.0.0.1:82/;
> 
>     }
> }
> 
> Location "/" is perfectly working. My problem is that "/api" location will
> decode special character.

When you want nginx to replace matching part of the URI with "/", 
it will do so on the decoded/normalized URI, and will re-encode 
special characters in what's left.

If you want nginx to preserve original URI as sent by the client, 
consider using proxy_pass without the URI part.  That is, 
instead of

    proxy_pass http://127.0.0.1:82/;

use 

    proxy_pass http://127.0.0.1:82;

Note no trailing "/".  This way the original URI as sent by the 
client will be preserved without any modifications.

-- 
Maxim Dounin
http://mdounin.ru/