web request Android

Is there any example of sending request to server which is really work on android? I am wasting second day for this search.
I have code which perfectly work in unity and receive empty answer from server on android. And I cant find full description(manual) what how to change permition or how to change code to make it work on android.

I don’t know how and why, but I was also facing the same problem and get it solved by just adding “http://” at the beginning of the URL. Weird solution, hope it helps.