Cuando pruebo mi backend en el localhost, funciona correctamente, pero cuando lo despliego en heroku me manda el siguien error:
Access to XMLHttpRequest at'https://chango-tareas-backend.herokuapp.com/api/send-email' fromorigin 'https://localhost:4200' has been blocked by CORS policy: No'Access-Control-Allow-Origin' header is present on the requestedresource.
Esta es la linea de codigo encargarda de enviar correos a traves de nodemailer
//ruta para enviar el correo con nodemailerrouter.post('/send-email', cors(), async (req, res) => { const { nombre, email, mensaje, url, destino } = req.body; contentHtml = `<h1>CV solicitante ${nombre}<h1><ul><li>Contactar a: ${email}</li><li>${mensaje}</li></ul><a href="${url}">Click para ver</a> `; const transporter = nodemailer.createTransport({ host: 'host_outlock', port: port, secure: false, auth: { user: 'micorreo@hotmail.com', pass: 'mipassword' } }); try{ const info = await transporter.sendMail({ from: "'ChangoTareas'<abisur_yue@hotmail.com>", to: `${destino}`, subject: `Solicitud de registro ${nombre}`, text: 'Hola guapo :v', html: contentHtml }); }catch(err){ next(err); } console.log('Message sent', info.messageId); res.status(200).send({ data: 'Success' });});En el console log de heroku me arroja las siguientes excepciones
2021-01-19T04:35:32.154277+00:00 app[web.1]: (node:36)UnhandledPromiseRejectionWarning: ReferenceError: next is not defined2021-01-19T04:35:32.154291+00:00 app[web.1]: at/app/src/routes/index.js:128:9 2021-01-19T04:35:32.154292+00:00app[web.1]: at processTicksAndRejections(internal/process/task_queues.js:97:5)2021-01-19T04:35:32.154416+00:00 app[web.1]: (node:36)UnhandledPromiseRejectionWarning: Unhandled promise rejection. Thiserror originated either by throwing inside of an async functionwithout a catch block, or by rejecting a promise which was not handledwith .catch(). To terminate the node process on unhandled promiserejection, use the CLI flag
--unhandled-rejections=strict(seehttps://nodejs.org/api/cli.html#cli_unhandled_rejections_mode).(rejection id: 1) 2021-01-19T04:35:32.154521+00:00 app[web.1]:(node:36) [DEP0018] DeprecationWarning: Unhandled promise rejectionsare deprecated. In the future, promise rejections that are not handledwill terminate the Node.js process with a non-zero exit code.2021-01-19T04:35:54.733967+00:00 heroku[router]: at=error code=H12desc="Request timeout" method=POST path="/api/send-email"host=chango-tareas-backend.herokuapp.comrequest_id=ba1f5e44-615f-4545-ab66-254db83c67a1 fwd="187.227.25.218"dyno=web.1 connect=1ms service=30000ms status=503 bytes=0protocol=https
