Can't figure out how to build URLs from Request

Hi,

I can't seem to find a way to build URLs from a request. I see that the adapter is built inside `Application.respond()` but it doesn't seem to be exposed. I also can't figure out an alternative way to build it.

Thanks,
Alec

PS. I have been looking for a Python web framework like clastic FOREVER. The global state in your typical Python framework drives me absolutely nuts. So thank you :)

Start by reading Application.respond() and tracing how the adapter is constructed. Determine whether the existing request context exposes a supported URL-building path, then confirm the intended behavior with the issue discussion; done means a clear, usable way to build URLs from a request.

Written by the indexing model from the issue text.