code: private void determineProxyIpAnyLocalAddress() {
          try {
              proxyIpAnyLocalAddress = proxyIp.isEmpty() || InetAddress.getByName(proxyIp).isAnyLocalAddress();
          } catch (UnknownHostException e) {
              proxyIpAnyLocalAddress = false;
          }
      }
docs: Determines if the proxy IP is set to listen on any local address and updates the corresponding flag accordingly.
  <p>
  The proxy IP is set to listen on any local address if it is either empty or the method
  {@code InetAddress#isAnyLocalAddress()} called on the proxy IP returns {@code true}.
  
  @see #proxyIpAnyLocalAddress
  @see #proxyIp
  @see #isProxyIpAnyLocalAddress()
  @see InetAddress#isAnyLocalAddress()