code: func (h *Handler) handleGetExport(w http.ResponseWriter, r *http.Request) {
  	switch r.Header.Get("Accept") {
  	case "text/csv":
  		h.handleGetExportCSV(w, r)
  	default:
  		http.Error(w, "Not acceptable", http.StatusNotAcceptable)
  	}
  }
docs: // handleGetExport handles /export requests.