向前端Scala Play返回错误消息

case class CustomException(message: String, errorCode: Int) extends Exception(message)

def someAction(): Action[AnyContent] = Action { implicit request =>
  try {
    // 执行某些操作
    // 如果发生错误，抛出自定义异常
    throw CustomException("发生错误", 500)
    
    Ok("操作成功")
  } catch {
    case e: CustomException =>
      BadRequest(Json.obj("error" -> e.message, "errorCode" -> e.errorCode))
    case _: Throwable =>
      InternalServerError("服务器内部错误")
  }
}

fetch('/someAction')
  .then(response => {
    if (!response.ok) {
      throw new Error(response.statusText);
    }
    return response.json();
  })
  .then(data => {
    // 处理成功响应
    console.log(data);
  })
  .catch(error => {
    // 处理错误响应
    console.error(error);
  });