如何优雅打印nginx header和body

场景

参考https://segmentfault.com/a/1190000000606867可以获取response的报文体，由于业务测试有获取响应头Header或响应体Body的需求，这里是通过header_filter_by_lua来分配响应报文头给变量实现的。

nginx配置

worker_processes  ;
error_log logs/error.log;
events {
    worker_connections ;
}
http {
    log_format log_req_resp '$remote_addr - $remote_user [$time_local] '
        '"$request" $status $body_bytes_sent '
        '"$http_referer" "$http_user_agent" $request_time req_body:"$request_body"'
        ' resp_body:"$resp_body" resp_header:"$resp_header"';

    server {
        listen ;
        access_log logs/access.log log_req_resp;

        set $resp_header "";
        header_filter_by_lua '
            local h = ngx.resp.get_headers()
            for k, v in pairs(h) do
            ngx.var.resp_header=ngx.var.resp_header..k..": "..v
            end
        ';

        lua_need_request_body on;

        set $resp_body "";
        body_filter_by_lua '
            local resp_body = string.sub(ngx.arg[], , )
            ngx.ctx.buffered = (ngx.ctx.buffered or "") .. resp_body
            if ngx.arg[] then
                ngx.var.resp_body = ngx.ctx.buffered
            end
        ';

        location / {
            echo "Hello World!";
        }
    }
}

然后access日志里就有啦~