Gorilla WebSocket

The industry-standard WebSocket implementation for Go, optimized for performance and full RFC 6455 compliance.

Gorilla WebSocket is the most widely adopted library for building real-time Go applications. It provides a complete implementation of the WebSocket protocol (RFC 6455) and consistently outperforms the standard library's x/net/websocket package in both speed and reliability. The API gives developers granular control over message types, connection lifecycles, and buffering strategies. It is the core engine behind high-scale systems like Mattermost and various Kubernetes components, handling thousands of concurrent stateful connections with a minimal memory footprint.

https://github.com/gorilla/websocket