How to connect Arduino with ESP8266-11 WiFi module to 000webhost (free webhosting)
The web server is using virtual hosts. Unless you tell it to which virtual host are you making a request, the server won't know where to send the request and generate an error.

You need to add the required header Host, which tell it just that.

Make the proper request like this:

String getStr = "GET /getCpno.php?user_type=admin HTTP/1.1\r\n";
getStr += "Host: jvystocksystem.000webhostapp.com\r\n"; // add the required header
getStr += "\r\n";