Web service not working in Web Player build

var url = "www.readof.com ..............?scene="+Scenes;

var www : WWW = new WWW (url);

yield www;

if (www.error == null){

var dataString = www.text;

print(www.text);

} }

else {

// something wrong!

Debug.Log(www.error);

} }

Hi This is my code. In web player build always get error message, but when I run with unity software,it returns the correct json string.I already try with http:// but ,.............!!!

Thanks