I have a connected app on Salesforce.  The OAuth flow has been working fine for over a year.  Now I want to add a new white listed url for local testing.  Our existing callback url for dev testing has always been http://localhost:3000/#/signup  now we want to add http://localhost:8080/#/signup as we are hosting the front end from tomcat in some cases. 

When we pass the updated callback url to the salesforce login page like so:
https://login.salesforce.com/services/oauth2/authorize?redirect_uri=http://localhost:8080/#/signup

After successful authorization it redirects to:
http://localhost:3000/#/signup

Are we limited to only 1 callback url entry for localhost?