body, err := ioutil.ReadAll(req.Body)
			if err != nil {
				writePlainText(http.StatusBadRequest, "error reading request body: "+err.Error(), w)
				return
			}
			defer req.Body.Close()
			response, err := setter(string(body))
			if err != nil {
				writePlainText(http.StatusBadRequest, err.Error(), w)
				return
			}
			writePlainText(http.StatusOK, response, w)
			return
		default: