Looking for a PHP page with POST support

I made a simple app to send POST requests to some server and show the result. It’s very simple but very useful, and I would like to distribute it.

However, I don’t have a test/example online page to demonstrate the program.

My question is: do you know any (stable) hosted PHP file that is waiting for some POST requests? I don’t really care what will be done with the sent data, or if it returns an error; I’m just looking for a page that will answer.