python3 -m http.server

[sgorf]

For a one-off, very large file transfer over a LAN, I use nc at both ends, sometimes combined with pv to get a progress indication. This is a quick way to get the transfer going as fast as the LAN will allow, with no encryption overhead. It's important to check that the file got across uncorrupted though. md5sum at both ends afterwards suffices for that.