Web service not working in Web Player build

in unity 3d js reading data from webservice

function Start(){

StartCoroutine(WaitForRequest());
}

function WaitForRequest() { var url = URL + "GetProgressionMapsSearchCount?KeyWord=";
var www : WWW = new WWW (url); yield www; forwardSpeed = www.text ; }

This is my code. In web player build not returning data from webservice, but when I run with unity software localy, it returns the correct

please i need help , tutorial or code example