Nginx 跨域

                        if ($request_method = 'OPTIONS') {
                                  add_header 'Access-Control-Allow-Origin' '*';
                                  add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
                                  #
                                  # Custom headers and headers various browsers *should* be OK with but aren't
                                  #
                                  add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
                                  #
                                  # Tell client that this pre-flight info is valid for 20 days
                                  #
                                  add_header 'Access-Control-Max-Age' 1728000;
                                  add_header 'Content-Type' 'text/plain charset=UTF-8';
                                  add_header 'Content-Length' 0;
                                  return 204;
                              }
                              if ($request_method = 'POST') {
                                  add_header 'Access-Control-Allow-Origin' '*';
                                  add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
                                  add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
                              }
                              if ($request_method = 'GET') {
                                  add_header 'Access-Control-Allow-Origin' '*';
                                  add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
                                  add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
                              }

        }