Various embodiments include systems and methods for supporting communication session establishment (e.g., Web Real-Time Communication (WebRTC) session establishment) between endpoint computing devices. Various embodiments include systems and methods that may provide for a server (e.g., a Simple WebRTC Application Protocol (SWAP) server acting as a WebRTC signaling server) that protects message privacy and integrity between endpoint computing devices by acting as a rendezvous point for applications and services. Various embodiments include systems and methods defining a simple, secure, and extensible signaling protocol that may allow a receiving party to determine and control other parties that may connect to the receiving party via communication session (e.g., a WebRTC session).