The cache header that will prevent a file from getting cached in dispatcher is Response.setHeader("Cache-Control: no-cache").
* Cache-Control Header: The Cache-Control header is a directive that specifies caching policies in both requests and responses.
* no-cache Directive: Setting the Cache-Control header to no-cache instructs the dispatcher and other intermediaries not to cache the response.
* Implementation: By including this header in the response, AEM ensures that the dispatcher retrieves the latest version of the content directly from the AEM instance rather than serving a cached version.