private static Task HandleExceptionAsync(HttpContext context, Exception exception)
{
var code = HttpStatusCode.InternalServerError; // 500 if unexpected
string message = string.Empty;
message = exception.Message;
var result = JsonConvert.SerializeObject(ResponseBase.CreateError(message));
context.Response.ContentType = "application/json";
context.Response.StatusCode = (int)code;
return(context.Response.WriteAsync(result));
}