Ajax request via dedicated page type

Because there are so many old pages floating around on this internet with a now faulty example of how to handle ajax requests via a dedicated page type in TYPO3 and I stumbled across it again today as part of a code refactoring, I want to do my part help dispel the assumption that the associated PAGE object needs to be mishandled via config.no_cache = 1. Because it doesn't have to. And it shouldn't either, because if you look at your log, you'll see a lot of warnings like "$TSFE->set_no_cache() was triggered. Reason: config.no_cache is set. Caching is disabled!".

And we don't want that. It is sufficient to integrate the content of the page as COA_INT or USER_INT. Because these objects are definitely not cached!

ajaxPage = PAGE
ajaxPage {
    typeNum = 123456789
   
    config {
        disableAllHeaderCode = 1
        admPanel = 0
        debug = 0
    }
   
    10 = COA_INT
    10 < plugin.tx_extensionname_pluginname
}

Or also with a different version

ajaxPage = PAGE
ajaxPage {
    typeNum = 123456789
    
    config {
        disableAllHeaderCode = 1
        admPanel = 0
        debug = 0
    }
   
    10 = USER_INT
    10 {
        userFunc = TYPO3\CMS\Extbase\Core\Bootstrap->run  
        extensionName = ExtensionName  
        pluginName = PluginName  
        vendorName = VendorName  
        controller = ControllerName  
        action = ajax  
    }
}