Node.js Express Passthrough?

Hello ive got the following error:

 Failed to load https://site.eu.auth0.com/user/ssodata/: No 'Access- 
Control-Allow-Origin' header is present on the requested resource

In my development i used Ember.js with Mirage allowing me to do:

this.passthrough('https://site.eu.auth0.com/user/ssodata/');

Is there something similar in Node.js Express that will work how this.passthrough worked in Mirage? I am also using nginx.