I am wondering if there is a public website with which I can test the POST http method?
As far as I know: http://www.posttestserver.com/
Unfortunately, the site referred to in the accepted answer no longer exists.
I used the web service client extension for Chrome.
I'm not sure if you want to use Android or Java at all. But you can easily configure the web service and client, as described here , and inspect the packages using a sniffer, such as Wireshark .