如何使Web应用程序只能从某些计算机上访问？

Question

I need a solution, how to make a web application hosted in web server can be accessible to certain computer machines using PHP language or Java. I need to restrict a web application to certain computer machines. So please tell me how it can achieved??

Answer 1

You make a whitelist of IP addresses that are allowed to connect to the web server.

Then you can get the client's IP addresses in PHP:

$userIpAddress = $_SERVER['REMOTE_ADDR'];

or in Java:

String userIpAddress = request.getHeader("Remote_Addr");

Note that getting the real IP address of the user can be tricky. See these questions:

• How can I retrieve IP address from HTTP header in Java
• what is the right way to get request's ip

The easiest way, though, would be to restrict clients' access directly in the webserver configuration.