Why would the browser need to reload all resources after a POST request? Presumably, only the main (HTML) page should be refreshed and other linked items (CSS/

Why would the browser need to reload all resources after a POST request? Presumably, only the main (HTML) page should be refreshed and other linked items (CSS/JS/media) with high max-age (and no 'must-revalidate' cache control header) should use the previously cached content.