func writeSuccessNoContent(w http.ResponseWriter) {
	writeResponse(w, http.StatusNoContent, nil, mimeNone)
}

// writeRedirectSeeOther writes Location header with http status 303
func writeRedirectSeeOther(w http.ResponseWriter, location string) {
	w.Header().Set(xhttp.Location, location)
	writeResponse(w, http.StatusSeeOther, nil, mimeNone)
}

func writeSuccessResponseHeadersOnly(w http.ResponseWriter) {

type ExtractFunc struct {
	Timeword string       `parser:" \"EXTRACT\" \"(\" @( \"YEAR\":Timeword | \"MONTH\":Timeword | \"DAY\":Timeword | \"HOUR\":Timeword | \"MINUTE\":Timeword | \"SECOND\":Timeword | \"TIMEZONE_HOUR\":Timeword | \"TIMEZONE_MINUTE\":Timeword ) "`
	From     *PrimaryTerm `parser:" \"FROM\" @@ \")\" "`
}

// TrimFunc represents TRIM sql function
type TrimFunc struct {

		// take this server down, return appropriate error.
		if opts.Maintenance {
			writeResponse(w, http.StatusPreconditionFailed, nil, mimeNone)
		} else {
			writeResponse(w, http.StatusServiceUnavailable, nil, mimeNone)
		}
		return
	}
	writeResponse(w, http.StatusOK, nil, mimeNone)
}

// ClusterReadCheckHandler returns if the server is ready for requests.
func ClusterReadCheckHandler(w http.ResponseWriter, r *http.Request) {