{"record":{"id":"53a09d92b974fd08","repo":"gofiber/fiber","slug":"w-q-to-q-w","errorCode":null,"errorMessage":"%w: %q to %q: %w","messagePattern":"%w: %q to %q: %w","errorType":"exception","errorClass":"ErrFileStore","httpStatus":null,"severity":"error","filePath":"ctx.go","lineNumber":600,"sourceCode":"\t\treturn fmt.Errorf(\"%w: %q: %w\", ErrFileRead, fileheader.Filename, fasthttp.ErrBodyTooLarge)\n\t}\n\n\tbuf := bytebufferpool.Get()\n\tdefer bytebufferpool.Put(buf)\n\n\tlimitedReader := io.LimitReader(file, int64(maxUploadSize)+1)\n\tif _, err = buf.ReadFrom(limitedReader); err != nil {\n\t\treturn fmt.Errorf(\"%w: %q: %w\", ErrFileRead, fileheader.Filename, err)\n\t}\n\n\tif buf.Len() > maxUploadSize {\n\t\treturn fmt.Errorf(\"%w: %q: %w\", ErrFileRead, fileheader.Filename, fasthttp.ErrBodyTooLarge)\n\t}\n\n\tdata := append([]byte(nil), buf.Bytes()...)\n\n\tif err := storage.SetWithContext(c.Context(), path, data, 0); err != nil {\n\t\treturn fmt.Errorf(\"%w: %q to %q: %w\", ErrFileStore, fileheader.Filename, path, err)\n\t}\n\n\treturn nil\n}\n\n// Secure returns whether a secure connection was established.\nfunc (c *DefaultCtx) Secure() bool {\n\treturn c.Scheme() == schemeHTTPS\n}\n\n// Status sets the HTTP status for the response.\n// This method is chainable.\nfunc (c *DefaultCtx) Status(status int) Ctx {\n\tc.fasthttp.Response.SetStatusCode(status)\n\treturn c\n}\n\n// String returns unique string representation of the ctx.","sourceCodeStart":582,"sourceCodeEnd":618,"githubUrl":"https://github.com/gofiber/fiber/blob/a105acad6c1e4576a77f01e02973f67e962bb58d/ctx.go#L582-L618","documentation":"Returned by SaveFileToStorage when the Storage backend's SetWithContext call fails. Wraps ErrFileStore, the filename, the destination path, and the backend's error: 'file: failed to store file: \"report.pdf\" to \"uploads/2024/report.pdf\": <backend err>'. This is the final stage of the pipeline, after the body was read and size-checked successfully.","triggerScenarios":"Calling c.SaveFileToStorage(fh, path, storage) where storage.SetWithContext returns an error: S3/blob put failed (auth, bucket missing, network), Redis/MySQL write failed, context canceled (client closed the request), or a custom Storage implementation returned any non-nil error.","commonSituations":"Expired/rotated storage credentials, wrong bucket/endpoint configuration, network partition to the storage service, context cancellation on slow uploads, permission errors on the destination key, or a custom Storage with a bug.","solutions":["Unwrap and classify the backend error (errors.Is(err, fiber.ErrFileStore)) then retry idempotent writes or surface 502/503.","Verify storage connectivity and credentials out-of-band (a health check against the same Storage) before blaming upload code.","Make the route honor c.Context() cancellation; long uploads to slow storage can trip request deadlines.","Use a deterministic key so a retry after a transient failure overwrites safely rather than duplicating."],"exampleFix":"if err := c.SaveFileToStorage(fh, key, store); err != nil {\n    if errors.Is(err, fiber.ErrFileStore) {\n        log.Errorf(\"storage write failed for %s: %v\", key, err)\n        return c.Status(fiber.StatusBadGateway).\n            SendString(\"storage unavailable\")\n    }\n    return err\n}","handlingStrategy":"try-catch","validationCode":"// optional preflight: ping the storage backend before accepting uploads\nif err := store.SetWithContext(ctx, \"healthcheck\", []byte(\"ok\"), 0); err != nil {\n    return fiber.NewError(fiber.StatusServiceUnavailable, \"storage down\")\n}","typeGuard":"null","tryCatchPattern":"if err := c.SaveFileToStorage(fh, key, store); err != nil {\n    if errors.Is(err, fiber.ErrFileStore) {\n        log.Errorf(\"storage write failed for %s: %v\", key, err)\n        return fiber.NewError(fiber.StatusBadGateway, \"storage unavailable\")\n    }\n    return err\n}","preventionTips":["Verify storage credentials and connectivity out-of-band (health check against the same Storage).","Use deterministic keys so retries overwrite safely rather than duplicate.","Respect c.Context() cancellation; slow storage on large uploads can trip request deadlines.","Branch on errors.Is(err, fiber.ErrFileStore) to isolate backend failures from upload parsing."],"tags":["upload","storage","s3","blob","gofiber","network"],"backgroundTag":null,"analyzedSha":"a105acad6c1e4576a77f01e02973f67e962bb58d","analyzedAt":"2026-08-11T17:33:26.942Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}