Thanks for replying and reminding of special characters!
It is not worked if I posted the request.... (d.png)
However, "set Label1.Text to get response Content" is "ok" !?!?
Is that the PHP code problem?
I have tried to change from $_POST to $_REQUEST in PHP.
It is worked when I posted the request in the browser(e.png), but it is still not worked in the emulator.