httpd是Apache超文本传输协议(HTTP)服务器的主程序。被设计为一个独立运行的后台进程，它会建立一个处理请求的子进程或线程的池。 -httpd is the Apache HyperText Transfer Protocol (HTTP) server' s main program. Is designed as a stand-alone background process, it will process the request to create a child