Add HTTP/3 curl diagnostic info to README

Author: khteh

README.md

@@ -156,3 +156,11 @@ mysql.connector.errors.IntegrityError: 1048 (23000): Column 'author_id' cannot b
 - visit https://localhost:4433/users/all
 - visit https://localhost:4433/authors/all
 - visit https://localhost:4433/books/all
+
+## Diagnostics
+
+- HTTP/3 curl:
+
+```
+$ docker run --rm ymuski/curl-http3 curl --http3 --verbose https://<nodeport service>:<nodeport>/healthz/ready
+```

hypercorn.toml

@@ -1,7 +1,7 @@
 accesslog = "/var/log/hypercorn/access.log"
 errorlog = "/var/log/hypercorn/errors.log"
 loglevel = "DEBUG"
-alt_svc_headers = ["h3=\":4433\"; ma=3600, h3-34=\":4433\"; ma=3600"]
+alt_svc_headers = ["h3=\":443\"; ma=86400"]
 bind = ["0.0.0.0:4433"]
 quic_bind = ["0.0.0.0:4433"]
 insecure_bind = ["0.0.0.0:8080"]