I think that if Glitch projects could have sub-domains onto their project URL would be great
For example: Say you want to add an API to your service you could have api.yourprojectname.glitch.me. Or if you were hosting a SMTP server so your app can use yor domain to send emails you coult have smtp.yourprojectname.glitch.me.
I think many users would like this feature
rather than having that configuration be done through glitch, an alternate approach is to make a new glitch app for what you’d use a subdomain for. For example, api.myproject.glitch.me becomes myproject-api.glitch.me.
Additionally, I’m not 100% sure on this, but with url mapping you may be able to simulate subdomains based on seperate projects.
so if you map
myproject.glitch.me to www.myproject.com
you may be able to also a separate project to an arbitrary subdomain