This endpoint serves requests which might originate from an image
preview link which had an http url and the message holding the image
link was rendered before we introduced thumbnailing. In that case
we would have used a camo proxy to proxy http content over https and
avoid mix content warnings.
In near future, we plan to drop use of camo and just rely on thumbor
to serve such images. This endpoint helps maintain backward
compatibility for links which were already rendered.
This setting splits away part of responsibility from THUMBOR_URL.
Now on, this setting will be responsible for controlling whether
we thumbnail images or not by asking bugdown to render image links
to hit our /thumbnail endpoint. This is irrespective of what
THUMBOR_URL is set to though ideally THUMBOR_URL should be set
to point to a running thumbor instance.
Aditya Bansal
Tim Abbott