Does CloudFront fully supports HTTP/3?

Question

I used a website to run a test for my HTTP/3-enabled website, but the website says:
![what the website said](/media/postImages/original/IM9_bMyq1xRZOMOQmo85LF5A)
Is this normal, or else?

Answer

CloudFront supports HTTP/3.  
However, the viewer must support TLSv1.3 and Server Name Indication (SNI). [1]

[1] Values that you specify when you create or update a distribution - Amazon CloudFront  
 https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/distribution-web-values-specify.html#DownloadDistValuesSupportedHTTPVersions

Answer

CloudFront does support HTTP/3 connection. It has been added to Cloudfront since 2022. 
In order for CloudFront to use HTTP/3, check if your viewer support TLSv1.3 and Server Name Indication (SNI). 
         
For additional information about HTTP/3 support for Amazon CloudFront, please refer to the following documentations: 
https://aws.amazon.com/blogs/aws/new-http-3-support-for-amazon-cloudfront/
https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/distribution-web-values-specify.html#DownloadDistValuesSupportedHTTPVersions

Does CloudFront fully supports HTTP/3?

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