隐藏X-Powered-By

修改 php.ini 文件 设置 expose_php = Off

apache 隐藏 server

修改httpd.conf 设置 

ServerSignature Off

ServerTokens Prod

nginx 隐藏 server

修改nginx.conf  在http里面设置 

server_tokens off;

隐藏响应的server,X-Powered-By