Example

Here are simples example for Leaflet and OpenLayers. To try it out, simply save the file in the typo3 webroot and open it in the browser. (The endpoint "/tile-proxy" must of course be defined).

OpenLayers

<!DOCTYPE html>
<html lang="en">

<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Quick Start - OpenLayer</title>
<script src="https://cdn.jsdelivr.net/npm/ol@v7.2.2/dist/ol.js"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/ol@v7.2.2/ol.css">

<style>
    html,
    body {
    height: 100%;
    margin: 0;
    }
</style>
</head>

<body>
<div id="map" style="width: 600px; height: 400px;"></div>
<script>
    let osmSource = new ol.source.XYZ({
    attributions: '&#169; ' +
        '<a href="https://www.openstreetmap.org/copyright" target="_blank">OpenStreetMap</a> ' +
        'contributors.',
    crossOrigin: 'anonymous',
    urls: [
        '/tile-proxy/?provider=osm&z={z}&x={x}&y={y}&s=a',
        '/tile-proxy/?provider=osm&z={z}&x={x}&y={y}&s=b',
        '/tile-proxy/?provider=osm&z={z}&x={x}&y={y}&s=c',
    ]
    });

    let extent = ol.proj.transformExtent([11.86, 51.41, 12.07, 51.55], 'EPSG:4326', 'EPSG:3857')
    let center = ol.proj.fromLonLat([11.940057754516602, 51.4974250793457]);
    var map = new ol.Map({

    layers: [
        new ol.layer.Tile({
        source: osmSource
        })
    ],
    target: 'map',
    view: new ol.View({
        center: center,
        zoom: 12,
        minZoom: 14
    })
    });
</script>
</body>

</html>
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Leaflet

<!DOCTYPE html>
<html lang="en">

<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Quick Start - Leaflet</title>
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.3/dist/leaflet.css"
    integrity="sha256-kLaT2GOSpHechhsozzB+flnD+zUyjE2LlfWPgU04xyI=" crossorigin="" />
<script src="https://unpkg.com/leaflet@1.9.3/dist/leaflet.js"
    integrity="sha256-WBkoXOwTeyKclOHuWtc+i2uENFpDZ9YPdf5Hf+D7ewM=" crossorigin=""></script>

<style>
    html,
    body {
    height: 100%;
    margin: 0;
    }
</style>
</head>

<body>
    <div id="map" style="width: 600px; height: 400px;"></div>
    <script>
        let markerLocation = [51.4974250793457, 11.940057754516602];

        const map = L.map('map').setView(markerLocation, 13);
        let southWest = L.latLng(51.41, 11.86),
            northEast = L.latLng(51.55, 12.07),
            bounds = L.latLngBounds(southWest, northEast);
        map.setMaxBounds(bounds);
        const tiles = L.tileLayer('/tile-proxy/?provider=osm&z={z}&x={x}&y={y}&s={s}', {
            minZoom: 13,
            attribution: '&copy; <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a>'
        }).addTo(map);

        const marker = L.marker(markerLocation).addTo(map)
            .bindPopup('<b>Hello world!</b><br />I am a popup.').openPopup();
    </script>
</body>

</html>
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