"No certificate" when testing Real AMP URL

I have a wordpress blog running the AMP for wordpress plugin. I’ve enabled “Real AMP URL”, but I’m getting “no certificate” as a response when I try to test using the “…/cdn-fpw/sxg/cert.pem.msg” url… it there anything that I need to do from my side to install the certificate? Is this related in anyway to SSL/TSL Full vs. Full (strict) connection?

Thanks in advance for your help,

How are you trying to test? To my knowledge, the only browser that supports signed exchanges is Chrome on Android. It works when serving amp pages via the google amp cache.

You can verify on the command line using the tools from here: https://github.com/WICG/webpackage/tree/master/go/signedexchange

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