MLAB MONGODB ROBO3T

https://yellowme.gitbooks.io/playbook/content/developing/guides/database/configure-a-mlab-database-to-robo-3trobomongo.html

"code": "ECONNECTION", "command": "CONN"

https://stackoverflow.com/questions/38431592/sending-mail-in-node-js-using-nodemailer

La solución al problema que presenté arriba se resuelve en 2 pasos:

1. agregar en el código:

antes del transporter:   process.env.NODE_TLS_REJECT_UNAUTHORIZED = "0";

  process.env.NODE_TLS_REJECT_UNAUTHORIZED = "0";
 
    // create reusable transporter object using the default SMTP transport
    let transporter = nodemailer.createTransport({
        host: 'smtp.gmail.com',
        port: 465,
        secure: true,

2. https://myaccount.google.com/lesssecureapps?pli=1

Habilitar Allow less secure apps: ON, en gmail.

Schema is not defined

https://stackoverflow.com/questions/24908405/mongoose-and-new-schema-returns-referenceerror-schema-is-not-defined

cache de computadora

https://techlandia.com/limpiar-cache-computadora-como_5973/ 

$(...).modal is not a function

https://stackoverflow.com/questions/25757968/bootstrap-modal-is-not-a-function

httpClient

https://stackoverflow.com/questions/47236963/no-provider-for-httpclient

how to embed a map

https://www.youtube.com/watch?v=ut3HYH3SJtQ