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diff --git a/osdep/Http.hpp b/osdep/Http.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_HTTP_HPP
+#define ZT_HTTP_HPP
+
+#include <string>
+#include <map>
+#include <stdexcept>
+
+#if defined(_WIN32) || defined(_WIN64)
+#include <WinSock2.h>
+#include <WS2tcpip.h>
+#include <Windows.h>
+#else
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#endif
+
+namespace ZeroTier {
+
+/**
+ * Simple synchronous HTTP client used for updater and cli
+ */
+class Http
+{
+public:
+	/**
+	 * Make HTTP GET request
+	 *
+	 * The caller must set all headers, including Host.
+	 *
+	 * @return HTTP status code or 0 on error (responseBody will contain error message)
+	 */
+	static inline unsigned int GET(
+		unsigned long maxResponseSize,
+		unsigned long timeout,
+		const struct sockaddr *remoteAddress,
+		const char *path,
+		const std::map<std::string,std::string> &requestHeaders,
+		std::map<std::string,std::string> &responseHeaders,
+		std::string &responseBody)
+	{
+		return _do(
+			"GET",
+			maxResponseSize,
+			timeout,
+			remoteAddress,
+			path,
+			requestHeaders,
+			(const void *)0,
+			0,
+			responseHeaders,
+			responseBody);
+	}
+
+	/**
+	 * Make HTTP POST request
+	 *
+	 * It is the responsibility of the caller to set all headers. With POST, the
+	 * Content-Length and Content-Type headers must be set or the POST will not
+	 * work.
+	 *
+	 * @return HTTP status code or 0 on error (responseBody will contain error message)
+	 */
+	static inline unsigned int POST(
+		unsigned long maxResponseSize,
+		unsigned long timeout,
+		const struct sockaddr *remoteAddress,
+		const char *path,
+		const std::map<std::string,std::string> &requestHeaders,
+		const void *postData,
+		unsigned long postDataLength,
+		std::map<std::string,std::string> &responseHeaders,
+		std::string &responseBody)
+	{
+		return _do(
+			"POST",
+			maxResponseSize,
+			timeout,
+			remoteAddress,
+			path,
+			requestHeaders,
+			postData,
+			postDataLength,
+			responseHeaders,
+			responseBody);
+	}
+
+private:
+	static unsigned int _do(
+		const char *method,
+		unsigned long maxResponseSize,
+		unsigned long timeout,
+		const struct sockaddr *remoteAddress,
+		const char *path,
+		const std::map<std::string,std::string> &requestHeaders,
+		const void *requestBody,
+		unsigned long requestBodyLength,
+		std::map<std::string,std::string> &responseHeaders,
+		std::string &responseBody);
+};
+
+} // namespace ZeroTier
+
+#endif