The Session ID That Wouldn't Stop Changing

Short summary

A distributed backend sharing sessions via Redis faced mysterious ID regeneration on every request—the Mezzio library's auto-regeneration was a session fixation defense incompatible with multi-service architecture. Rather than patch or fork, the author contributed an upstream opt-in flag, prioritizing maintainability over quick fixes.

• •Session IDs regenerated on every request in a distributed two-service architecture
• •Root cause: Mezzio library auto-regenerates on data writes as session fixation defense
• •Solution: contributed upstream configuration flag for opt-out instead of local patching or forking

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