Header Informer
header-informer.php is a tool installed on a webserver used to gain insight on a server's view point of what information is available when a page request is made or data is transferred to the server via POST or GET methods. The tool is an all-in-one html-css-php file because web-2.0-ifying the tool would add uncessary complexity. I use this tool for troubleshooting and illustrating server issues.
Update 21-Nov-2025I used to run a demo, but due to security concerns, the demo is no longer available. The source code is available on github. To be fair, I cannot remeber the last time this tool saw any use as browser inspectors have been very good for some time.
Explore the live header informer demo