如何使用localhost尝试除错误404之外的其他HTTP错误

Using localhost server (wamp/xampp), is it possible to try simulate most HTTP errors (400,401,402,500,503(...))?

I've done custom error page using .htaccess and PHP but I can only test for error 404. How about other errors?

There is a function called header in PHP.

See the documentation https://secure.php.net/manual/en/function.header.php

With it you can send a HTTP header to browser.

Or if you have PHP5.4 or greater you can use this:

http://www.php.net/manual/en/function.http-response-code.php