Debugging WebSocket Issues Overview WebSocket "invalid frame header" errors often stem from raw HTTP being written to an upgraded socket, not actual frame corruption. The most common cause is multiple instances conflicting on the same HTTP server. When to Use - Error: - Error: - Error: - WebSocket connects then immediately disconnects with code 1006 - Server logs success but client receives garbage data Quick Reference | Symptom | Likely Cause | Fix | |---------|--------------|-----| | RSV1 must be clear | Multiple WSS on same server OR compression mismatch | Use mode | | Hex starts with | Ra…