I was asked to test a meteor (js) website in a server without websockets support, how can I achieve this? How can I really know that a server is not capable of using websockets?


You can achieve that by using environment variables. Remember to always do this on server, either by using /server/lib or /lib/server folder or Meteor.isServer flag. This will do the trick:

Meteor.startup(function () {
  process.env.DISABLE_WEBSOCKETS = 1;

You can read more about using environment variables with Meteor on Meteorpedia.


For those interested, when websockets are disabled, Meteor uses sockjs which is a websockets emulator library.

More info here:




This project might help folks who get here: https://github.com/cult-of-coders/fusion

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