Architect
May 4, 2015 · Backend Development
Ensuring Reliable Message Delivery in Web IM Systems: The Six‑Message Ack Protocol
This article explains how web instant‑messaging systems achieve reliable, non‑lost and non‑duplicate message delivery by using a six‑message protocol (msg R/A/N and ack R/A/N), timeout‑based retransmission, and deduplication mechanisms.
Ack ProtocolBackendIM
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