Non Customized Error Messages (Error Message Reveals Internal IP Address/Underlying Technology)
1. Send various invalid data input or insert illegal characters to the URL or the HTTP request.
2. Observe underlying technology or IP address or internal file path is disclosed such as followings:
<address>Apache/2.2.22 (Ubuntu) PHP/5.3.10-1ubuntu3.9 with Suhosin-Patch at 127.0.1.1 Port 80</address>