AMP-Analytics: Errors with Google Tag-Manager

What’s the issue?

A change made in the following PR is resulting in the __amp_source_origin to be excluded from requests to an amp-analytics config file. https://github.com/ampproject/amphtml/pull/12787

Google Tag Manager appears to omit all CORS headers unless this GET parameter is included. Because Access-Control-Allow-Origin: * is therefore not included by GTM, the browser throws the following error:

Failed to load https://www.googletagmanager.com/amp.json?id=GTM-KCTM85F&gtm.url=https%3A%2F%2Fwww.simgolf.dk%2F: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. Origin ‘https://www.simgolf.dk’ is therefore not allowed access. If an opaque response serves your needs, set the request’s mode to ‘no-cors’ to fetch the resource with CORS disabled.

How do we reproduce the issue?

One example provided in the #general Slack channel was for https://www.simgolf.dk/

What browsers are affected?

I am assuming all.

Which AMP version is affected?

The latest build: https://github.com/ampproject/amphtml/releases/tag/1516396600278

[david-aa]

Any Update? Due to this I was stuck and can not able to use gtm in my page

Maybe it’s a silly question but, have you published your GTM container?

[sryze]

I’m experiencing the same issue, even though it was said that the fix has been released. Do I need to change something in Google Tag Manager configuration?

Failed to load https://www.googletagmanager.com/amp.json?id=MY_ID&gtm.url=https%3A%2…mysite.com&__amp_source_origin=https%3A%2F%2Fwww.mysite.com: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'https://www.mysite.com' is therefore not allowed access. The response had HTTP status code 403. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.