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diff --git a/updater/HttpClient.hpp b/updater/HttpClient.hpp
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+/*
+ * ZeroTier One - Network Virtualization Everywhere
+ * Copyright (C) 2011-2015  ZeroTier, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * --
+ *
+ * ZeroTier may be used and distributed under the terms of the GPLv3, which
+ * are available at: http://www.gnu.org/licenses/gpl-3.0.html
+ *
+ * If you would like to embed ZeroTier into a commercial application or
+ * redistribute it in a modified binary form, please contact ZeroTier Networks
+ * LLC. Start here: http://www.zerotier.com/
+ */
+
+#ifndef ZT_HTTPCLIENT_HPP
+#define ZT_HTTPCLIENT_HPP
+
+#include <string>
+#include <map>
+#include <set>
+
+#include "../node/Mutex.hpp"
+
+namespace ZeroTier {
+
+class HttpClient_Private_Request;
+
+/**
+ * HTTP client that does queries in the background
+ *
+ * The handler method takes the following arguments: an arbitrary pointer, an
+ * HTTP response code, the URL queried, whether or not the message body was
+ * stored on disk, and the message body.
+ *
+ * If stored on disk, the body string contains the path and the file must be
+ * moved or deleted by the receiver when it's done. If an error occurs, the
+ * response code will be negative and the body will be the error message.
+ *
+ * All headers in the returned headers map will have their header names
+ * converted to lower case, e.g. "content-type".
+ *
+ * Currently only the "http" transport is guaranteed to be supported on all
+ * platforms.
+ */
+class HttpClient
+{
+public:
+	friend class HttpClient_Private_Request;
+	typedef void * Request;
+
+	HttpClient();
+	~HttpClient();
+
+	/**
+	 * Empty map for convenience use
+	 */
+	static const std::map<std::string,std::string> NO_HEADERS;
+
+	/**
+	 * Request a URL using the GET method
+	 */
+	inline Request GET(
+		const std::string &url,
+		const std::map<std::string,std::string> &headers,
+		unsigned int timeout,
+		void (*handler)(void *,int,const std::string &,const std::string &),
+		void *arg)
+	{
+		return _do("GET",url,headers,timeout,handler,arg);
+	}
+
+	/**
+	 * Cancel a request
+	 *
+	 * If the request is not active, this does nothing. This may take some time
+	 * depending on HTTP implementation. It may also not kill instantly, but
+	 * it will prevent the handler function from ever being called and cause the
+	 * request to die silently when complete.
+	 */
+	void cancel(Request req);
+
+private:
+	Request _do(
+		const char *method,
+		const std::string &url,
+		const std::map<std::string,std::string> &headers,
+		unsigned int timeout,
+		void (*handler)(void *,int,const std::string &,const std::string &),
+		void *arg);
+
+	std::set<Request> _requests;
+	Mutex _requests_m;
+};
+
+} // namespace ZeroTier
+
+#endif