code: public final J4pClientBuilder proxy(String pProxyHost, int pProxyPort, String pProxyUser, String pProxyPass) {
          httpProxy = new Proxy(pProxyHost,pProxyPort, pProxyUser,pProxyPass);
          return this;
      }
docs: Set the proxy for this client
  
  @param pProxyHost  proxy hostname
  @param pProxyPort  proxy port number
  @param pProxyUser  proxy authentication username
  @param pProxyPass  proxy authentication password