For a little while now I've been running into instances where all of the image URLs returned from the API will be relative rather than absolute. Unfortunately I can't provide any sure-fire steps to reproduce because the behavior for identical queries sent some time apart can be different. For example, last night sending a request to /api/videos/ without any sorting/filtering/pagination would return relative links, but this morning, the exact same request is giving absolute links. During the period where it was returning relative links I could seemingly consistently get absolute links by adding additional parameters to the query, but my testing wasn't exhaustive.
From what I've seen, the relative links are always attempting to point at the same resource as the absolute ones: