[yxshee]

With etag: false, a request carrying If-Match: * for a file that exists gets 412 Precondition Failed. RFC 9110 section 13.1.1 says * is true whenever the server has a current representation, so it doesn't depend on an ETag being present. With the default etag: true the same request already gets 200.

http.createServer((req, res) => send(req, req.url, { root: 'test/fixtures', etag: false }).pipe(res)).listen(3000)
// curl -i -H 'If-Match: *' localhost:3000/name.txt
// actual: 412 Precondition Failed    expected: 200 OK, body "tobi"

The fix checks for * before looking at the ETag header, so a missing ETag only fails the precondition when the client lists actual entity tags.

I added a test under "where If-Match is set" that makes this request with etag: false. On master it fails with Error: expected 200 "OK", got 412 "Precondition Failed". With the fix all 140 tests pass (npm test and npm run test-ci), and npm run lint is clean.