🐛/✨ Bug Report/Feature Request — Improve/fix inconvenient path quirks in module fallback service (because of leading /s)

[dario-piotrowicz]

As I've been working with the module fallback service I've found three quirks that I had to workaround (in this patch function).

These are all related to leading /s in paths and I believe could/should be addressed in workerd itself without consumers of the service having to deal with them.

The quirks are:

• the referred/specifier paths that workerd provides to the service always start with /, this can be problematic in windows where absolute paths do not start with / (patch)
• when returning a redirection (301) result, such needs to start with /, again this is problematic in windows where absolute paths do not start with / (patch)
• when returning a module (200) result, the name of the module must not include /, that in my opinion is a bizzare/confusing behavior because in all other cases workerd includes leading /s but in this case it actually refuses paths that start with / (patch)