Allow dataset_id to contain URL-encoded forward slashes (%2f)

[matrss]

I'd like to use slashes to denote a hierarchy within dataset_ids. Literal slashes can't be used because of how the routes are constructed. Normally this is what URL-encoding is for, but FastAPI and/or the layers below have a bug that uses %2f for routing decisions. There doesn't seem to be any progress in fixing this bug properly, but there is a workaround for FastAPI users: fastapi/fastapi#7328 (comment)

I think this workaround should be implemented in xpublish.

More on this topic:

• URL slash encoded fastapi/fastapi#791
• [BUG] Routing of encoded slash URL Kludex/starlette#826

[mpiannucci]

There is another way to go about this that works today: You can use a path param type with a custom rest:

self._dataset_route_prefix = f"/my/prefix/{{dataset_id:path}}"

This will give the fully qualified path to a dataset as the dataset id, complete with slashes and all

[matrss]

Huh, for some reason I thought that path parts in routes must come at the end due to the potential for ambiguous routes. I'll give it a try, thanks!