Systems and methods for providing a full reverse translating proxy for streaming media content, which can employ session tracking or transmuxing, or both. The described system can be integrated seamlessly into an existing adaptive streaming environment. The system can transmux each request from a client into a delivery format supported by an origin content server, and vice versa, irrespective of the specific delivery format used by either the client or server. Conversely, the system can further transmux the requested content into the delivery format used by the client. A stateful session model can link each request from a specific end user for a specific piece of content to a particular identified client streaming session.