Syntax (example)

Servername, example:
- webserver01.hostingcompany.com
- 123.111.222.123

Hostname, example:
- www.amite.net
- http://amite.net
- amite.net/contact/
- http://amite.net/contact/index.php

About

Sends a customized HTTP GET request to a (web)server. This enables you to test & varify how the server responds to requests from a specific hostname (domain name).

You can, among other things, use this tool to see how your "new" webserver actually responds to requests addressed to your domain name on the server. By checking this in advance you increase the odds of a smooth server-to-server migration.