Your WebSocket says "connected" but stopped sending data. Here's the bug TCP keepalive can't catch.
A developer discovered that their WebSocket connection to Binance appeared connected but stopped receiving data for 22 hours without triggering any errors. The issue, known as silent staleness, occurs when the TCP connection remains active but application-level data flow halts. The solution involves monitoring the time since the last message was received and reconnecting if it exceeds a threshold.
- ▪The WebSocket connection to Binance showed as connected but stopped delivering data for 22 hours.
- ▪TCP keepalive cannot detect when application-level data stops flowing, even if the underlying connection is intact.
- ▪The developer implemented a message-level staleness detection mechanism that monitors the time since the last message and triggers a reconnect if needed.
- ▪Many common fixes like reconnecting on error or using ping messages fail because no error is raised and some servers don't respond to pings.
- ▪The recommended solution is to track the last message timestamp and treat excessive delays as a failure, regardless of the TCP connection state.
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try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 3935396) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } Mixa_Dev Posted on May 16 Your WebSocket says "connected" but stopped sending data. Here's the bug TCP keepalive can't catch. #webdev #phyton #websocket #debugging Two weeks ago, my crypto signal API silently failed for 22 hours. No errors. No exceptions. No crash. The service kept running, logs continued to flow, my deployment dashboard showed everything green. I only noticed when I happened to check the database and realized no new data had been written for almost a full day.
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