Modern web applications increasingly deliver downloadable content through asynchronous workflows and short‑lived URLs instead of static direct file links. This shift – driven by security, cost optimization, and dynamic content generation – creates serious challenges for automated clients, analytics pipelines, and web scrapers that need to reliably fetch files. Async delivery patterns (e.g., “your file is being prepared, we’ll email you when it’s ready”) and expiring, tokenized URLs (signed URLs, one‑time links, etc.) can break naïve download workflows and lead to missing data, partial archives, or failure‑prone scrapers.