Can I add custom headers to my request?

[LarsFagerbakke]

Please have a look at this codepen: https://codepen.io/_lars_/pen/PoYZgQo 

I took a example and found some documentation about request options, request | ArcGIS API for JavaScript 4.12 

Is it possible to add basic auth header to my request in this way?

[RobertScheitlin__GISP]

Lars,

  This thread should help.

https://community.esri.com/thread/236136-how-to-use-a-key-in-an-esrirequest-call