# nginx.conf
server {
  listen 8989;
  aio threads;
  ...
  ngx_link_func_lib "/path/to/your-plugin/main.so"; # sharing data memory with server 1 if the path are same with server 1
  ...
  ...
  location = /test {
      ngx_link_func_call "return_custom_http_headers_and_response" 
  }
}