Reusing Browser Sessions Instead of Fresh Logins Cuts Automation Flag Rate Dramatically
A developer running browser automation across dozens of accounts found that logging in fresh on every run was the primary trigger for anti-bot detection systems. Switching to persisted browser sessions — saved after a single manual login and reloaded on subsequent runs — reduced failure rates from roughly one in four runs to one in thirty. Anti-bot systems treat repeated fresh logins as suspicious signals, while a reused session mimics the behavior of a returning human user. The developer also found that sharing a session file between accounts caused both to be flagged quickly, emphasizing the need for strict per-account session isolation. Staleness is handled reactively by detecting login redirects or 401 responses, rather than logging in preemptively on a timer.
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