Upspin-webdav serves the upspin name space over WebDAV to localhost. Some caveats: - On macOS Big Sur arm64 the kernel panics on renames. Amd64 and iOS don't seem to have this problem. - On Windows it looks like one has to edit some registry keys to allow it to connect to a non-https server even on localhost, but I could have just been holding it wrong. It's certainly no replacement for FUSE+upspinfs. Still, WebDAV might be useful when one cannot load kernel modules for FUSE, or in order to sync files with devices that only support WebDAV.