Notes on image delivery, format negotiation, and caching.https://picsoar.com/en-ushttps://picsoar.com/blog/webp-fallbacks-that-actually-work/https://picsoar.com/blog/webp-fallbacks-that-actually-work/Why user-agent sniffing breaks WebP delivery, what the Accept header really tells you, and the two cases where serving the original is the correct answer.Tue, 14 Jul 2026 00:00:00 GMT