The Eaglercraft plugin creates a WebSocket listener.
To run a server for Eaglercraft 1.8.8, you cannot use a standard Minecraft Java server (like Spigot or Paper) directly, because Eaglercraft uses a custom binary WebSocket protocol instead of Java’s TCP protocol. eaglercraft 1.8.8 servers
While legally grey due to DMCA violations of the original project, the technology remains a robust method for web-based multiplayer gaming, keeping the legacy of Minecraft 1.8 PvP alive in the browser era. The Eaglercraft plugin creates a WebSocket listener