HttpRequest r(url);
	FileAppend fa(localFile);
	fa << r.Range(fa.GetSize()).Execute();

	String range;

	range = "";

		data << "URL: " << url << "\r\n"
		     << "Host: " << host_port << "\r\n"
		     << range
		     << "Connection: " << (keep_alive ? "keep-alive\r\n" : "close\r\n")
		     <<...
	

		data << "CONNECT " << host_port << " HTTP/1.1\r\n"
		     << "Host: " << host_port << "\r\n"
		     << range;
	

	HttpRequest&  Range(const int64 from, const int64 to)
	{
		range << "Range: bytes=" << from << "-" << to << "\r\n";
		return *this;
	}

	HttpRequest&  Range(const int64 from)
	{
		range << "Range: bytes=" << from << "-" << "\r\n";
		return *this;
	}

	HttpRequest&  Header(const char *id, const String& data);

r.Header("Range", String().Cat() << "bytes=" << from << "-" << to);