Support @aspace_backend_url with a path and ensure URI join respects it

[payten]

So.. this might be a bit brute force, but it works!

The first thing we do is now check if aspace_backend_url has a path and store this in aspace_backend_path. Also, we ensure there's a trailing / on the path.

So now we have something like:

aspace_backend_url = 'https://mydomain/my/path'
aspace_backend_path = '/my/path/'

Now in get and post_json, we join the incoming path with the aspace_backend_url and aspace_backend_path. We remove any leading / from the path so it's treated as a relative path:

URI.join(@aspace_backend_url, @aspace_backend_path, path.gsub(/^\//,""))

For example when logging in, this would join 'https://mydomain/my/path' with '/my/path/' and 'users/login'. This results in https://mydomain/my/path/users/login.

When there's no aspace_backend_path (or when it's '/'), this simply becomes the root path and users/login is appended.

[jambun]

😋