Configure Tag Manager to use protocol-relative URLs

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To help secure tag data, the Google Tag Manager container tag uses HTTPS to load resources (i.e.

If you need to load your Tag Manager containers in a protocol-relative manner, you may do so by adjusting the protocol in your container code to be // instead of https://.

<!-- Google Tag Manager -->
new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
<!-- End Google Tag Manager -->
<!-- Google Tag Manager (noscript) -->
<noscript><iframe src="//"
height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
<!-- End Google Tag Manager (noscript) -->

When you use a protocol-relative URL, the container is loaded via HTTP on pages that use http://, and via HTTPS on pages that use https://.

Older versions of the Tag Manager container code used a protocol-relative URL to load containers (i.e., // These older protocol-relative versions of the Tag Manager container code will continue to work.