API endpoint - POST /api/2/img/warmup?auth=[API_SECRET]
/warmup performs transformations and caches them, so it will speed up the first response time from the real user.
The typical usecase could be an application where the user can upload images by themselves and then see them once uploaded. The first render could take some time (1-4 seconds) and using /warmup will decrease the response time.
The below example will warm up caches for 2 variants of the image: