code: 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)
  	}
  }
docs: // RequestLogger returns a logger handler using a custom LogFormatter.