n/a

set your domain in the public networking section of the service settings and follow the instructions

I click on custom domain and it prompts me to enter a domain so I entered https://www.mydomain.com/applicationname, but it didn't work. Can you point me to the documentation that explains it?

that is a URL, you need to enter a domain

thanks

Would this work with a sub domain? For example I wouldn't want the railway application to be in the root domain, like www.myapplication.com, but rather www.mywebsite.com/myapplication

thats would be a url path not a subdomain, and no that would not work, it would be up to your app to serve its content on the /myapplication path

ok thanks 😎