see more from https://github.com/openzipkin/brave/issues/867, also see https://github.com/apache/incubator-dubbo/issues/3576
return this;
    }
    /**
     * get local address.
     *
     * @return local address
     */
    public InetSocketAddress getLocalAddress() {
        return localAddress;
    }
    /**
     * set local address.
     *
     * @param address
     * @return context
     */
    public RpcContext setLocalAddress(InetSocketAddress address) {
        this.localAddress = address;
        return this;
    }
    public String getLocalAddressString() {
        return getLocalHost() + ":" + getLocalPort();
    }
    /**
     * get local host name.
     *
     * @return local host name
     */
    public String getLocalHostName() {
        String host = localAddress == null ? null : localAddress.getHostName();