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When a client cancels an HTTP request (e.g., connection timeout, client disconnect), the context gets canceled and propagates through the system as "context canceled" or "code = Canceled" errors. These errors were being treated as internal server errors (500) when they should be treated as client errors (400). Problem: - Client cancels request or connection times out - Filer fails to assign file ID with "context canceled" - S3 API returns HTTP 500 Internal Server Error - This is incorrect - it's a client issue, not a server issue Solution: Added detection for context canceled errors in filerErrorToS3Error(): - Detects "context canceled" and "code = Canceled" in error strings - Returns ErrInvalidRequest (HTTP 400) instead of ErrInternalError (500) - Properly attributes the error to the client, not the server Changes: - Updated filerErrorToS3Error() to detect context cancellation - Added test cases for both gRPC and simple context canceled errors - Maintains existing error handling for other error types This ensures: - Clients get appropriate 4xx error codes for their canceled requests - Server metrics correctly reflect that these are client issues - Monitoring/alerting won't trigger false positives for client timeouts Fixes #7060