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I recently received this message below from Google. It says I am using SharedArrayBuffers but I have no idea what those are. Is there a way to determine if I am using what they say I am? The only type of cross domain stuff I am doing is within an iframe where I am calling script through postmessage on a different parent domain. However, I don't know if this is related to that.

Google systems have recently detected that SharedArrayBuffers (SABs) are used on https://basketball.exposureevents.com/, but COOP and/or COEP headers are not served.

For Web Compatibility reasons Chrome is planning to require COOP/COEP for the use of SABs from Chrome 91 (2021-05-25) onwards. Please implement 'cross-origin-isolated' behavior on your site.
Mike Flynn
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  • I had the same email and asked about it here: https://stackoverflow.com/questions/66642859/new-requirements-for-sharedarraybuffers-on-https-example-com. I'm pretty confused to be honest. If I get an answer on my question I'll update here. – 4532066 Mar 15 '21 at 22:02
  • Hi Mike - this page (https://web.dev/cross-origin-isolation-guide/) was updated yesterday to provide advice re. how to find the page on your site that's using / or linking to Javascript that contains `SharedArrayBuffer` code. ON my site it turned out it was linked to some JS delivered via an advert. – 4532066 Mar 17 '21 at 21:11

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