title: Fetching a Google Sheet csv file yields CORS error
body: <p>I try to tech data from a Google spreadsheet using <a href="https://github.com/jsoma/tabletop/blob/master/examples/simple/no-tabletop.html" rel="nofollow noreferrer">this code</a></p>
  <pre><code>function init() {
      Papa.parse(public_spreadsheet_url, {
        download: true,
        header: true,
        complete: showInfo
      })
    }
  </code></pre>
  <p>This yields the following CORS error:</p>
  <p><code>Access to XMLHttpRequest at 'link to shared Google Sheet CSV' from origin 'my domain' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.</code></p>