Developer Finds TCP Forwarder Bug Dropping 3% of Messages Only on Remote Servers

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A software developer discovered that a small TCP forwarder service was silently losing around 3% of messages on staging servers, while local laptop tests consistently showed zero loss. The root cause was a flawed assumption in the read loop: the code treated each syscall read as delivering exactly one complete message, ignoring that TCP can batch multiple lines into a single read. The bug only became visible under real network conditions and higher load, which is why clean remote servers exposed it while the developer's local environment did not. Placing counters at every layer — client sent, server parsed, server replied, client received — pinpointed exactly where messages were disappearing. A twelve-line fix to the read loop resolved the discrepancy, after which all four counters matched across both environments.

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ProgrammingDEV Community ·

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