proxy_pass_request_headers off的坑

版权声明：本文为博主原创文章，转载请注明出处。 https://blog.csdn.net/daiyudong2020/article/details/78572442

举个例子，客户端访问80端口，服务器需要将请求转发至8080端口处理，

我们希望将客户端传递的headers过滤，再设置内部转发请求header（test:"123"），

坑（通过ngx.req.set_header设置的请求头，会被过滤）：

    server {  
        listen 80;  
  
        location / {
            content_by_lua '
                ngx.req.set_header("test", "123")
                local response = ngx.location.capture("/upstream",
                {
                    method = ngx.HTTP_GET,
                    vars = {
                        my_uri = "/hello",
                    },
                    body = "",
                }
                )
                ngx.exit(200)
            ';
        }

        location /upstream {
            set $my_uri $my_uri;
            proxy_pass_request_headers off;
            proxy_pass http://127.0.0.1:8080$my_uri;
        }  
    }
  
    server {  
        listen 8080;  
        location /hello {  
            content_by_lua '
                for k, v in pairs(ngx.req.get_headers()) do
                    ngx.log(ngx.ERR, "###: " .. k .. " : " .. v)
                end
            ';
        }  
    } 

正确做法（传递header，重新设置）：

    server {  
        listen 80;  
  
        location / {
            content_by_lua '
                local response = ngx.location.capture("/upstream",
                {
                    method = ngx.HTTP_GET,
                    vars = {
                        my_uri = "/hello",
                        my_test = "123",
                    },
                    body = "",
                }
                )
                ngx.exit(200)
            ';
        }

        location /upstream {
            set $my_uri $my_uri;
            set $my_test $my_test;
            proxy_pass_request_headers off;
            proxy_set_header test $my_test;
            proxy_pass http://127.0.0.1:8080$my_uri;
        }  
    }  
  
  
    server {  
        listen 8080;  
        location /hello {  
            content_by_lua '
                for k, v in pairs(ngx.req.get_headers()) do
                    ngx.log(ngx.ERR, "###: " .. k .. " : " .. v)
                end
            ';
        }  
  
    }  

原文出自： http://blog.csdn.net/daiyudong2020/article/details/78572442

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