Rule from network under performance category
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cache-control developers/website owners can specify precisely how/where and when the resources are allowed to be cached.
Part of these options that can be configured are
public, which define:
privatethat only browsers may cache this resource, meaning the best security as this is per users and proxy servers will ignore these resources.
publicwill allow proxies and servers in between to cache and re-use the file.
As is noted, these two differ quite a bit. And as such make no sense being used together, which would only confuse browsers and negate most of the benefits of specifying a specific type.
cache-control header to include only
public, not both.
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