在nodejs中返回响应时，无法在将标头发送到客户端后设置标头

Question

when i send a request to this function it show me this error:

    events.js:292
      throw er; // Unhandled 'error' event
      ^

Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
    at ServerResponse.setHeader (_http_outgoing.js:533:11)
    at ServerResponse.header (F:\Projects\Nodejs\SalesSignal\node_modules\express\lib\response.js:771:10)
    at ServerResponse.send (F:\Projects\Nodejs\SalesSignal\node_modules\express\lib\response.js:170:12)
    at ServerResponse.json (F:\Projects\Nodejs\SalesSignal\node_modules\express\lib\response.js:267:15)
    at ServerResponse.send (F:\Projects\Nodejs\SalesSignal\node_modules\express\lib\response.js:158:21)
    at ManagerController.Ok (F:\Projects\Nodejs\SalesSignal\src\http\controller\BaseController.js:18:28)
    at F:\Projects\Nodejs\SalesSignal\src\http\controller\ManagerController.js:121:25

my function is this and this function fir update record:

      async DeleteManager(req, res, next) {
    let result = await this.ValidationAction(req, res);
    if (result[0]) {
      const user = Manager.findByIdAndUpdate(
        req.params.id,
        { $set: { isDelete: true } },
        { useFindAndModify: false },
        (error, user) => {
          if (error) {
            next(error);
          } else if (!user) {
            return  res.status(200).send({
              message: "رکورد مورد نظر یافت نشد",
              statusCode: 200,
              success: false,
            });
          } else {
            return res.status(200).send({
              message: "عملیات با موفقیت انجام شد",
              statusCode: 200,
              success: true,
            });
          }
        }
      );
    }
    return this.BadRerquest(res, result[1]);
  }

when i send a request to this functin it update record in database but it show me this error.

whats the problem? how can i solve thus problem?

Answer 1

Most likely your app tries to send multiple responses to the single request. This may happen because the app seems to always send BadRequest even if there is result[0] . Try to change the control flow from:

if (result[0]) {
  // ...
}
return this.BadRerquest(res, result[1]);

to

if (result[0]) {
  // ...
} else {
  return this.BadRerquest(res, result[1]);
}