Indeed, the actual heavy lifting is done by the Go standard library; this line (https://github.com/eliben/static-server/blob/main/internal/s...) is where the real magic happens (ignoring the logging middleware):

    fileHandler := serveLogger(serveLog, http.FileServer(http.Dir(rootDir)))

Yeah, with the "go 1.21.0" line in the go.mod file, it only works on Go 1.21. Here's what I get on Go 1.20:

  $ go run .
  go: errors parsing go.mod:
  .../static-server/go.mod:3: invalid go version '1.21.0': must match format 1.23

Eli, you might consider changing that to "go 1.20" so it works on Go 1.20 (and older, actually -- it's the 1.2.3 format that is getting in the way on Go pre-1.21).

Done now; thanks for the note!