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39 long-form articles on production engineering — how real systems fail, why, and what actually fixed them.

1 article matching “RFC 6455”

WebSockets & Real-timeMay 22, 202620 min read

Slack Sends Messages Over HTTP, Not Its WebSocket — and the Durability Bug That Forced the Switch

When you press Enter in Slack, the message does not travel over the WebSocket your client is holding open — it goes out as a separate HTTPS POST to chat.