We have the issue on sites behind AWS Loadbalancers.
for example, two of our sites use Cloudflare -> AWS ELB -> EC2, when taking AWS ELB out and pointing Cloudflares DNS directly to a single EC2 instance the error goes away.
The same sites also have the same Gutenberg issues on Localhost if we run them within docker environments.
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This reply was modified 5 years, 5 months ago by brand42. Reason: Adding the same issue but for docker
We have the same issue with AWS ELB, and Updating posts with Gutenberg.
.../wp/wp-admin/post.php?post=X&action=edit&meta-box-loader=1&meta-box-loader-nonce=XXX&_locale=user and
.../wp-json/wp/v2/pages/X?_locale=user
returns 403
But if we switch the DNS to point directly to the EC2 instance it works fine
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This reply was modified 5 years, 5 months ago by brand42. Reason: Formatting
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This reply was modified 5 years, 5 months ago by brand42. Reason: removed nounce