How to redirect with query string in Nginx

Question

I would like to redirect:

something.com/search?keywords='value'

to

something.com/search?q='value'

Here is my Nginx config:

location ~ /search {
       if ($args ~* "keywords=(.*)") {
            rewrite ^.*$ /search?q=$arg_keywords permanent;
        }
    }

But the q parameter is empty on redirection.

What is wrong?

Solution

But the q parameter is empty on redirection.

I don't see that problem. When I test the configuration as written, it creates a redirection loop because the original keywords='value' is appended to the rewritten URI.

You can prevent rewrite from including any original parameters by appending a ? to the rewritten URI.

For example:

rewrite ^ /search?q=$arg_keywords? permanent;

See this document for details.