public ProxySpecification withHost(String host) {
        return new ProxySpecification(host, port, scheme, username, password);
    }
public ProxySpecification withHost(String host) {
        return new ProxySpecification(host, port, scheme, username, password);
    }
public ProxySpecification withHost ( String host ) { return new ProxySpecification ( host , port , scheme , username , password ) ; }
Specify the hostname of the proxy.

@param host The hostname of the proxy.
@return A new ProxySpecification instance
Specify the hostname of the proxy .