fix 500 response in http proxy

HTTPProxy.cpp

@@ -93,7 +93,7 @@ namespace proxy
 	//TODO: handle this apropriately
 	void HTTPProxyHandler::HTTPRequestFailed(/*HTTPProxyHandler::errTypes error*/)
 	{
-		static std::string response = "HTTP/1.0 500 Internal Server Error\r\nContent-type: text/html\r\nContent-length: 0\r\n";
+		static std::string response = "HTTP/1.0 500 Internal Server Error\r\nContent-type: text/html\r\nContent-length: 0\r\n\r\n";
 		boost::asio::async_write(*m_sock, boost::asio::buffer(response,response.size()),
 					 std::bind(&HTTPProxyHandler::SentHTTPFailed, shared_from_this(), std::placeholders::_1));
 	}