HttpRequest& HttpRequest::Part(const Vector<String>& header, const String& data,
                               const char *content_type)
{
	if(IsNull(multipart)) {
		POST();
		multipart = AsString(Uuid::Create());
		if (content_type && *content_type)
			ContentType(String(content_type) + "; boundary=" + multipart);
		else ContentType("multipart/form-data; boundary=" + multipart);
	}
	postdata << "--" << multipart << "\r\n";
	for (int i = 0; i < header.GetCount(); i++){
		postdata << header[i] << "\r\n";
	}

	postdata << "\r\n" << data << "\r\n";
	return *this;
}