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How can I read and process POST request variables using nginx?

I use nginx (v1.4.1) for an external service proxy, but would like to be able to check and possibly modify the request body POSTbefore proxying it. The problem is that currently I can’t access the body of the request POSTwhile processing the request, whether through a variable $request_bodyor otherwise.

I read a few posts and SO questions and implemented this proposed strategy , which is intended for body logging POSTusing the directive proxy_pass). However, although this works for me, I still cannot read anything from $request_bodyduring the processing of the request.

For clarity, here is the corresponding section of my configuration:

location /proxy-this/ {
    client_max_body_size 8k;
    client_body_buffer_size 16k;
    client_body_in_single_buffer on;
    proxy_pass https://example.com/external-endpoint/;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header Host $http_host;
    proxy_set_header Content-Length '';
}

:

location /proxy-this/ {
    ... (same configuration as above) ...
    set $request_body $request_body&extra_param=1;
}

, nginx_lua, HttpFormInputModule, , .

+4
2

proxy_set_body?

location /proxy-this/ {
  ... (same configuration as above) ...
  proxy_set_body $request_body&extra_param=1;
}
+2

POST . , -, GET.

proxy_pass https://example.com/external-endpoint/?extra_param=1;
-2

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