index.html

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    <title>VAG API - OpenAPI Documentation</title>

<body>
    <div><small><a href="index.html">[DE]</a><a id="en" href="#">/[EN]</a></small></div>

    <div id="openapi">

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    <script>       
        var xhr = new XMLHttpRequest();
        xhr.open('HEAD', "openapi_en.yaml", true);
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            const ui = SwaggerUIBundle({
                url: "openapi_en.yaml", 
                dom_id: "#openapi"
            })            
	};
        window.onload = function () {
            const ui = SwaggerUIBundle({
                url: "openapi.yaml", 
                dom_id: "#openapi"
            })
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