基于request_method在nginx中设置proxy_pass

Question

我有两个应用程序和一个 nginx 服务器。我想将 nginx 上的所有 GET 请求代理到 http://127.0.0.1:9101/ and proxy all other request methods to http://10.41.115.241:8000/

上的一个应用运行

我尝试了几个选项，但 none 有效我试过使用 limit_exempt

  location /api/v1/executions {
    error_page 502 = @apiError;

    rewrite ^/api/(.*)  / break;

    proxy_pass            http://127.0.0.1:9101/;

    limit_except PUT POST DELETE {
      proxy_pass http://10.41.115.241:8000/;
    }


    proxy_read_timeout    90;
    proxy_connect_timeout 90;
    proxy_redirect        off;

    proxy_set_header      Host $host;
    #proxy_set_header      X-Real-IP $remote_addr;
    proxy_set_header      X-Forwarded-For $proxy_add_x_forwarded_for;

    #proxy_set_header Connection '';
    chunked_transfer_encoding off;
    proxy_buffering off;
    proxy_cache off;
    #proxy_set_header Host $host;
  }

我也试过if条件

  location /api/v1/executions {
    error_page 502 = @apiError;

    rewrite ^/api/(.*)  / break;


    proxy_pass http://10.41.115.241:8000/;

    if ($request_method = GET) {
      proxy_pass            http://127.0.0.1:9101/;
    }

    proxy_read_timeout    90;
    proxy_connect_timeout 90;
    proxy_redirect        off;

    proxy_set_header      Host $host;
    #proxy_set_header      X-Real-IP $remote_addr;
    proxy_set_header      X-Forwarded-For $proxy_add_x_forwarded_for;

    #proxy_set_header Connection '';
    chunked_transfer_encoding off;
    proxy_buffering off;
    proxy_cache off;
    #proxy_set_header Host $host;
  }

但在这两种方式中我都遇到了这个错误

"proxy_pass" cannot have URI part in location given by regular expression, or inside named location, or inside "if" statement, or inside "limit_except" block in /path/to/config

Answer 1

对于 NGINX 中的条件逻辑，始终尝试使用 map 而不是 if。除非 map 绝对不可能。在您的特定情况下，这很容易。

创建一个变量 $backend，它将根据请求方法保存您想要的 proxy_pass 值：

http {
    map $request_method $backend {
        default http://10.41.115.241:8000/; 
        GET http://127.0.0.1:9101/;
    }
    ...
}

然后在你的配置中使用它：

  location /api/v1/executions {
    error_page 502 = @apiError;

    rewrite ^/api/(.*)  / break;


    proxy_pass $backend;

    proxy_read_timeout    90;
    proxy_connect_timeout 90;
    proxy_redirect        off;

    proxy_set_header      Host $host;
    #proxy_set_header      X-Real-IP $remote_addr;
    proxy_set_header      X-Forwarded-For $proxy_add_x_forwarded_for;

    #proxy_set_header Connection '';
    chunked_transfer_encoding off;
    proxy_buffering off;
    proxy_cache off;
    #proxy_set_header Host $host;
  }

基于request_method在nginx中设置proxy_pass

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