socket学习

Socket编程TCP/UDP&&序列化和反序列化理解应用层:
- https://blog.csdn.net/m0_74722801/article/details/143894745
- https://cloud.tencent.com/developer/article/2468691
网络】自定义协议 | 序列化和反序列化 | 以tcpServer为例: https://blog.csdn.net/muxuen/article/details/132158717
OpenResty的核心和精髓：cosocket:https://www.cnblogs.com/liekkas01/p/12757576.html

openresty socket:

location /test {
     resolver 114.114.114.114;
      content_by_lua_block {
         local sock = ngx.socket.tcp()
         local ok, err = sock:connect("www.baidu.com", 80)
         if not ok then
             ngx.say("failed to connect to baidu: ", err)
             return
         end
          local req_data = "GET / HTTP/1.1\r\nHost: www.baidu.com\r\n\r\n"
         local bytes, err = sock:send(req_data)
         if err then
             ngx.say("failed to send to baidu: ", err)
             return
         end
          local data, err, partial = sock:receive()
         if err then
             ngx.say("failed to recieve to baidu: ", err)
             return
         end
          sock:close()
         ngx.say("successfully talk to baidu! response first line: ", data)
     }
}