middleware/logger.go
func RequestLogger(f LogFormatter) func(next http.Handler) http.Handler {
	return func(next http.Handler) http.Handler {
		fn := func(w http.ResponseWriter, r *http.Request) {
			entry := f.NewLogEntry(r)
			ww := NewWrapResponseWriter(w, r.ProtoMajor)

			t1 := time.Now()
			defer func() {
				entry.Write(ww.Status(), ww.BytesWritten(), time.Since(t1))
			}()

			next.ServeHTTP(ww, WithLogEntry(r, entry))
		}
		return http.HandlerFunc(fn)
	}
}
func RequestLogger(f LogFormatter) func(next http.Handler) http.Handler {
	return func(next http.Handler) http.Handler {
		fn := func(w http.ResponseWriter, r *http.Request) {
			entry := f.NewLogEntry(r)
			ww := NewWrapResponseWriter(w, r.ProtoMajor)

			t1 := time.Now()
			defer func() {
				entry.Write(ww.Status(), ww.BytesWritten(), time.Since(t1))
			}()

			next.ServeHTTP(ww, WithLogEntry(r, entry))
		}
		return http.HandlerFunc(fn)
	}
}
// RequestLogger returns a logger handler using a custom LogFormatter.