text: Title: Autocomplete path portion in URL bar
  Body: Currently, URL bar supports autocomplete for base URLs (https://domain.io) and variables. Please support path segments also.
  For example, I'm playing with [Gmail API](https://developers.google.com/gmail/api/reference/rest), which has a URL like this:
  
  ```
  https://gmail.googleapis.com/gmail/v1/users/{userId}/messages
  ```
  
  I want that after I type "https://gmail.googleapis.com/", Posting suggests "gmail", after I accept this suggestion and type "/", Posting continue to suggest "v1" and so on.
  The path portions are from the collection.