public void ProcessRequest(HttpContext context)
 {
     context.Response.ContentType = "text/plain";
     try
     {
         string requestStr = GetString.ConvertContextToString(context);
         if (string.IsNullOrEmpty(requestStr))
         {
             context.Response.Write("fail");
         }
     }
     catch (Exception ex)
     {
         context.Response.Write("error");
     }
     context.Response.Write("success");
 }