AnonymousHTMLcachingPseudoCode

sub vcl_recv {
    if the request isn't GET|HEAD|PURGE {
        skip the rest of vcl_recv code
    }
    // Rest of vcl_recv code
    perform a lookup in cache
}

sub vcl_backend_response {
    if the request isn't GET|HEAD|PURGE {
    mark responses as uncacheable (We don’t want to cache requests such as POST)
    remember the above decision for 120 seconds
    call the deliver function
}

if the response from origin is text/html and is not an error {
        if the request has no session cookie, and isn't personalised URL {
            remove the Set-Cookie header from the response to the browser
            set a cache expiry time of 6 hours
            set a state while re-validate time of 12 hours
        } else {
            mark the response as uncacheable
            remember the above decision for 120 seconds
        }
        call the deliver function
    }
}

sub vcl_hash {
    as a precaution, split the cache between in session and anonymous users {
        hash_data("has_session_cookie");
    } else {
        hash_data("no_session_cookie");
    }
}