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As of September 2023, QUIC and HTTP/3 are not supported by CloudFront. The CloudFront Developer Guide states that only HTTP/1.1 and HTTP/2 are supported by CloudFront. As a result, at this moment, it is not feasible to create a WebTransport connection to CloudFront.
You can also visit this post: https://repost.aws/questions/QUftx-8O4ZQQ6LKK6Lw0aD3w/http-3-not-working-any-longer-for-cloudfront & https://repost.aws/questions/QUftx-8O4ZQQ6LKK6Lw0aD3w/http-3-not-working-any-longer-for-cloudfront
answered 7 months ago
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Hi, are you sure of your statement re . http/3 and quic ? see https://aws.amazon.com/about-aws/whats-new/2022/08/amazon-cloudfront-supports-http-3-quic/ which says the opposite. Also https://aws.amazon.com/blogs/aws/new-http-3-support-for-amazon-cloudfront/ demonstrates how to implement those.
Interesting point is that content from S3 has been served on HTTP3 with right headers h3... but the rest definitely has been downgraded to HTTP2.