for customers. Best means balancing size and quality We used to save different versions of our images on S3 using a python script Later on, we created our own resizer. Problems: Cost a lot We had had to ﬁx bugs Used another CDN's resizer, but we overloaded it. Poor customer experience.
format called HAL Image Opto is compatible with URI template RFC 6570. Some resizer formats are not compatible! Example: ?downsize=233:350 Clients (web or app) do not construct URLs They still need some control