A method, a media renderer device and a media source device for providing content over a network, and a message structure for controlling a real-time transport protocol (RTP) are provided. The method includes transferring a hypertext transfer protocol (HTTP) control command generated so that content is provided from a media server providing content using a RTP. The HTTP control command can use an HTTP POST command or an HTTP PUT command. When transferring AV content using a RTP, the content is controlled using an existing HTTP not a Real-Time Streaming Protocol (RTSP). Accordingly, a RTP can be more easily supported.