WeChat Client Technology Team

Jan 4, 2017 · Backend Development

How WeChat Optimizes Mobile TCP Connections: Timeout, Strategies, and IP Sorting

This article examines WeChat's Mars STN module, detailing TCP connection timeout handling, the trade‑offs between serial, concurrent and composite connection strategies, and the evolution of IP‑Port sorting algorithms—from random combinations to history‑aware and forgetting mechanisms—to achieve high performance, low load, and high availability on mobile networks.