@SuppressWarnings("nls")
    private StringBuilder buildParams(StringBuilder url) {
        addQueryParam(url, "db", database, "?");
        addQueryParam(url, "u", username, "&");
        addQueryParam(url, "p", password, "&");
        addQueryParam(url, "rp", retentionPolicy, "&");
        addQueryParam(url, "precision", timePrecision, "&");
        return url;
    }
Simple write to "/write". Must be valid Influx line format.

@param payload document to write, as string (payload may be a batch).
@param failureHandler handler in case of failure
gateway/engine/influxdb/src/main/java/io/apiman/gateway/engine/influxdb/InfluxDb09Driver.java