By default, common image formats(
have a one-year
Cache-Control policy applied(
public, max-age=31536000, must-revalidate).
You may customize either the
value and the regex of which files to
value must be a valid
Cache-Control policy and
test must be a valid
regex of the types of files you wish to test.
If you don't want browsers to cache assets from the public directory, you can disable this: