- Not working behind Nginx (Works okay behind Caddy)
- Reduce idle memory use?

- Folder icons in dir list
- ".." from server to server list is broken
- Redirect to add trailing slashes
- Add file size in directory listing
- Allow spaces in server names
- Deny unused HTTP methods for endpoints
- ETag cache based on mtime
- Server-side hash?
- Log / audit log?
- Add "Last check-in time" to server list

- Prevent directory traversal attacks in file_server.rs
- Error handling

- Reverse proxy to other local servers

Off-project stuff:

- Benchmark directory entry sorting

Known issues:

Relay can't shut down gracefully if Firefox is connected to it, e.g. if Firefox
kept a connection open while watching a video.
I'm pretty sure this is a bug in Hyper, so for now I've worked around it with a
forced shutdown timer.

Sometimes I get the turtle icon in Firefox's network debugger. But this happens
even with Caddy running a static file server, so I can't prove that it's on my
side. The VPS is cheap, and the datacenter is far away.