vercel.json

{
    "rewrites": [
        {
            "source": "/feed",
            "destination": "/feed.xml"
        },
        {
            "source": "/feed/",
            "destination": "/feed.xml"
        },
        {
            "source": "/feed.xml",
            "destination": "/feed.xml"
        },
        {
            "source": "/atom",
            "destination": "/feed.xml"
        },
        {
            "source": "/atom/",
            "destination": "/feed.xml"
        },
        {
            "source": "/atom.xml",
            "destination": "/feed.xml"
        },
        {
            "source": "/rss",
            "destination": "/feed.xml"
        },
        {
            "source": "/rss.xml",
            "destination": "/feed.xml"
        },
        {
            "source":"/:year(.*)/:blog(.*)/:path(.*)",
            "destination":"/:year*/:blog*/"
        }
    ]
}