title: Swagger-ui keeps showing example petstore instead of provided swagger.json
body: <p>I followed instructions to set up swagger documentation for my existing node API using swagger-jsdoc.
  The swagger.json is being served correctly and I added a path to it in the url parameter of the SwaggerUiBundle in index.html like this:</p>
  
  <pre><code>const ui = SwaggerUIBundle({
  url: "https://my.domain:5292/swagger.json",
  dom_id: '#swagger-ui',
  presets: [
    SwaggerUIBundle.presets.apis,
    SwaggerUIStandalonePreset
  ],
  plugins: [
    SwaggerUIBundle.plugins.DownloadUrl
  ],
  layout: "StandaloneLayout" })
  </code></pre>
  
  <p>However, the first thing it tries to do when opening the page in the browser is showing the default <em><a href="http://petstore.swagger.io/v2/swagger.json" rel="noreferrer">http://petstore.swagger.io/v2/swagger.json</a></em> instead of my <em>swagger.json</em>. It actually fails to do so because I'm serving the page through https and the petstore is not https but that's a different matter... </p>
  
  <p>Inputing my address to the <em>swagger.json</em> manually into the form on the page works as expected. It shows the API page correctly and validates it. However, I don't want to always re-enter the address there and would like to have it as a default.</p>