The admin bot creates a new browsing context with createBrowsingContext() and uses that to create a page. Each browsing context should have a dedicated disk cache but how does chrome handle this? I deduced that it uses in-memory disk cache and it's much smaller than the default on-disk disk cache. The incognito tab of my browser has the same behavior.
The following page alerts "not cached" due to cache miss in incognito mode but no error happens in a regular tab.
$ head /dev/urandom -c 5242880 > chunk
$ cat <<EOF > index.html
