Serving Polymer App to a /path not at root

<!--

      The `<base>` tag below is present to support two advanced deployment options:
      1) Differential serving. 2) Serving from a non-root path.
    
      Instead of manually editing the `<base>` tag yourself, you should generally either:
      a) Add a `basePath` property to the build configuration in your `polymer.json`.
      b) Use the `--base-path` command-line option for `polymer build`.
    
      Note: If you intend to serve from a non-root path, see [polymer-root-path] below.

-->
    <base href="https://stackoverflow.com/">
<!-- ... -->

<script>
    /**
    * [polymer-root-path]
    *
    * By default, we set `Polymer.rootPath` to the server root path (`/`).
    * Leave this line unchanged if you intend to serve your app from the root
    * path (e.g., with URLs like `my.domain/` and `my.domain/view1`).
    *
    * If you intend to serve your app from a non-root path (e.g., with URLs
    * like `my.domain/my-app/` and `my.domain/my-app/view1`), edit this line
    * to indicate the path from which you'll be serving, including leading
    * and trailing slashes (e.g., `/my-app/`).
    */
    window.Polymer = {rootPath: "https://stackoverflow.com/"};
  // ...    
 

</script>