Hello World CS - URL Approval List

Last updated on September 4, 2025

Network access requirements

If your school uses a firewall or blocks certain domains, make sure to approve these URLs to ensure Hello World CS works as it should:

  • learn.helloworldcs.org
  • app.pickcode.io
  • api.app.pickcode.io
  • cdn.app.pickcode.io
  • webviewer.pickcode.app
  • Delightex (formerly CoSpaces) - allow access to all domains listed on this page
  • unsplash.com
  • python-api-k5et7rir6a-uc.a.run.app
  • python-api-mmgqwaw7ka-uc.a.run.app
  • identitytoolkit.googleapis.com
  • securetoken.googleapis.com
  • www.google-analytics.com