CloudFront recently announced HTTP/3 support. I wanted to add it to the CloudFront distributions at work. I looked at the AWS Terraform Provider docs for setting the HTTP version. It said:
The maximum HTTP version to support on the distribution. Allowed values are
http3. The default is
I was confused about the difference between
http3. I looked at the CloudFront API docs, which said pretty much the same thing as the Terraform docs.
I decided to look at the console to see what the options were:
After seeing this, it became a lot clearer what was going on. The documentation says “The maximum HTTP version”, but this is no longer accurate with the release of HTTP/3 support.
http3 means HTTP/3 and HTTP/1.1;
http2 means HTTP/2 and HTTP/1.1; and
http2and3 means HTTP/3, HTTP/2, and HTTP/1.1.