public String toString () {
        String ret = this.proto + ":" + this.server + "[" + this.endpoint;
        if ( this.options != null ) {
            for ( Entry<String, Object> entry : this.options.entrySet() ) {
                ret += "," + entry.getKey() + "=" + entry.getValue();
            }
        }
        ret += "]";
        return ret;
    }