https://localhost:3001 no longer supported with ArcGIS Online

[PeterKnoop]

It seems that ArcGIS Online no longer permits you to use "localhost" as an Allowed Origin for CORS. So you cannot set https://localhost:3001 as an Allowed Origin, as required by Experience Builder.

The instructions in ArcGIS Experience Builder install, therefore, no longer work. When you get to Step #8 under "Create Client ID using ArcGIS Online or ArcGIS Enterprise", you cannot get past the error message, "Your application domain is not allowed via Cross-Origin Resource Sharing (CORS)..."

Instead of localhost, one has to set the fully-qualified domain name of their computer (e.g., http://mycomputer.mydomain:3001) as an Allowed Origin on your ArcGIS Online instance, and use it in place of https://localhost:3001 everywhere in the Experience Builder instructions.

Do the instructions need updating, or is there an easy way around this that I am missing?

[PeterKnoop]

@awgeezrick we ended up getting real SSL certs for our development machines, and ensuring their domains were added to the "Allow origins" list in ArcGIS Online settings.

[awgeezrick]

Thanks for the info, I ended up doing the same thing an all is good now. 

Thanks again. 

Mark

[boro]

Running into this issue too... Literally no idea how I can continue from here... This is so frustrating, update the guide or just remove it for crying out loud