replace part of request_uri before passing it to proxy_pass

问题

i'm trying to replace specific part or request_uri using rewrite, but it won't work for some reason

example url: http://example.com:3000/?soft=55191&src1=changethis&src2=HOME&type=0&id=7700458

server {

       server_name example.com;
       listen 3000;

    location / {
        resolver 8.8.8.8;
        rewrite ^(?<=&src1=)(.*)(?=&src2)$ changewiththis$1 break;
        proxy_pass http://example2.com;
    }

}

so the Goal here is to replace the exact string between 'src1=' and '&src2' so it can be passed to proxy_pass with the changed string

回答1:

The location and rewrite directives use a normalised URI which does not include the query string (anything from the ? onwards).

To manipulate the query string, you will need to look at the $request_uri or $args variables, or the individual parameters using the $arg_ family of variables (e.g. $arg_src1).

The simplest solution may be to use a map directive to manipulate $request_uri before passing the new value upstream.

For example:

map $request_uri $changethis {
default                                           $request_uri;
~(?<prefix>.*[?](|.*&)src1)=[^&]*(?<suffix>.*)$   $prefix=newvalue$suffix;
}

server {
    ...
    location / {
        resolver ...;
        proxy_pass http://example.com$changethis;
    }
}

See this document for details.

来源：https://stackoverflow.com/questions/57281041/replace-part-of-request-uri-before-passing-it-to-proxy-pass