openresty设置用于access_log的自定义变量

期望：在access_log打印自定义变量define_error_code

nginx配置：

    worker_processes  1;  

    events {  
        worker_connections  1024;  
    }  


    http {  

        log_format main '[$time_local] $request $status $remote_addr $define_error_code';  

        server {  
            listen       80;  

            location / {  
                set $define_error_code '';  
                content_by_lua_block {  
                    ngx.var.define_error_code = 9527  
                    ngx.say("hello world")  
                }  
            }  

            access_log logs/access.log main;  
            error_log logs/error.log;  
        }  

    }  

测试结果：