如何优雅打印nginx header和body

Posted 2022-09-25

场景

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  1;
error_log logs/error.log;
events 
    worker_connections 1024;

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 8082;
        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[1], 1, 1000)
            ngx.ctx.buffered = (ngx.ctx.buffered or "") .. resp_body
            if ngx.arg[2] then
                ngx.var.resp_body = ngx.ctx.buffered
            end
        ;

        location / 
            echo "Hello World!";
        
    

然后access日志里就有啦~

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