304 Not Modified Response Setup

If some resource has already been scanned and has not changed since then, then there is no need to scan it again. You can also take data from a previous scan.

This applies to entire pages of the site, and to all static resources from which it consists (pictures, scripts, styles, fonts, etc.).

Static files - pictures, scripts, styles, etc.

Each file has a modification date. For example, let's look at the pictures. They rarely change. If you configure the server correctly, any image will be downloaded once and subsequently used from the cache. If you change the original on the server, its update date will change and a new image will be loaded into the cache, which will be used until it is updated again.
This applies to all static files.

Dynamic files - website pages

Dynamic files include the site pages themselves. They can be generated on the fly and show new data with each update.
In most cases, we know the creation and update date of each page, but this information relates specifically to the content, and the pages also consist of various static files. It would be possible to use the date of the last change in the content for the Last-Modified headers, but if the picture, site design or scripts change, then we will not see these changes, since we will receive the entire page from the cache.
Therefore, I recommend using periodic updates for pages no more than once a week.
When the content is updated, it will be updated immediately, and if the content has not changed, it will still be updated every 7 days.
This is ideal.