Testing Methods for HTTP/3 Access

As HTTP/3 and QUIC are gradually becoming more popular, how can you test whether your website supports the HTTP/3 protocol? Assuming your custom domain is: mycustom.com
1. You can test HTTP/3 support using curl: 

curl --http3 -kv https://mycustom.com

2. You can also test HTTP/3 access using a mobile browser. In practical tests, it was found that HTTP/3 access failed on PC using Chrome/Edge, but worked normally on mobile browsers (such as the built-in browser on Huawei phones or the Quark browser). However, note that you may need to refresh the page twice. The first access may default to HTTP 1.1, and then the second access upgrades to HTTP 3.0. To check if your mobile browser supports HTTP/3, you can visit: https://http3.is, which is a tool website for confirmation.

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