{"id":"a258e46af978e9bc","repo":"gofiber/fiber","slug":"failed-to-reset-session-w","errorCode":null,"errorMessage":"failed to reset session: %w","messagePattern":"failed to reset session: %w","errorType":"http","errorClass":null,"httpStatus":null,"severity":"error","filePath":"middleware/session/store.go","lineNumber":189,"sourceCode":"\t// Decode session data if found\n\tif rawData != nil {\n\t\tsess.data.Lock()\n\t\terr := sess.decodeSessionData(rawData)\n\t\tsess.data.Unlock()\n\t\tif err != nil {\n\t\t\tsess.mu.Unlock()\n\t\t\tsess.Release()\n\t\t\treturn nil, fmt.Errorf(\"failed to decode session data: %w\", err)\n\t\t}\n\t}\n\n\tsess.mu.Unlock()\n\n\tif isFresh && s.AbsoluteTimeout > 0 {\n\t\tsess.setAbsExpiration(time.Now().Add(s.AbsoluteTimeout))\n\t} else if sess.isAbsExpired() {\n\t\tif err := sess.Reset(); err != nil {\n\t\t\treturn nil, fmt.Errorf(\"failed to reset session: %w\", err)\n\t\t}\n\t\tsess.setAbsExpiration(time.Now().Add(s.AbsoluteTimeout))\n\t}\n\n\treturn sess, nil\n}\n\n// getSessionID returns the session ID using the configured extractor.\n// The extractor is provided by the shared extractors package.\n//\n// Parameters:\n//   - c: The Fiber context.\n//\n// Returns:\n//   - string: The session ID.\n//\n// Usage:\n//","sourceCodeStart":171,"sourceCodeEnd":207,"githubUrl":"https://github.com/gofiber/fiber/blob/9a4c7e57fe0b080a04235d28a4b0d2b4b353d58c/middleware/session/store.go#L171-L207","documentation":"Returned by getSession when AbsoluteTimeout is configured and the session has expired (sess.isAbsExpired()): Fiber calls sess.Reset() which deletes the old session from storage, and the storage Delete fails. The session is logically dead but the store (Redis/DB/memcache) rejected the delete.","triggerScenarios":"Configuring Config.AbsoluteTimeout, then on a request whose session crossed the absolute deadline the storage backend errors on DeleteWithContext (connection lost, timeout, permission error, or the request context was canceled).","commonSituations":"Storage backend briefly down or saturated during a session-expiry reset; network partition; rotated credentials; client disconnect canceled the request context mid-delete.","solutions":["Verify storage backend health and connectivity (Redis/DB reachable, not saturated).","Ensure the request context is not being canceled early by a client disconnect before the delete completes.","Handle the error by returning 5xx or regenerating a fresh session id."],"exampleFix":"// ensure the context used for reset is request-scoped and not prematurely canceled\nctx := c.Context()\nif err := storage.DeleteWithContext(ctx, oldID); err != nil {\n    log.Errorf(\"storage delete failed during reset: %v\", err)\n}","handlingStrategy":"fallback","validationCode":null,"typeGuard":null,"tryCatchPattern":"sess, err := store.Get(c)\nif err != nil {\n    // Reset/storage hit a transient error: fall back to a fresh session.\n    log.Warnf(\"session reset failed, serving fresh session: %v\", err)\n    // surface as recoverable, let middleware regenerate\n    return fiber.ErrInternalServerError\n}","preventionTips":["Monitor storage delete latency and errors.","Keep AbsoluteTimeout shorter than storage TTL to avoid races.","Don't reuse a canceled context for storage writes."],"tags":["session","storage","timeout","fiber"],"analyzedSha":"9a4c7e57fe0b080a04235d28a4b0d2b4b353d58c","analyzedAt":"2026-08-04T21:44:03.395Z","schemaVersion":2}