readme added demo site, example upd

README.md

@@ -47,3 +47,11 @@ Sent QUIC client Initial, ALPN: h3-25h3-24h3-23
 < HTTP/3 200
 HTTP/3 200
 ```
+
+### Demo
+
+- Site: http3.yurets.pro
+
+- Online test: [http3check](https://www.http3check.net/?host=http3.yurets.pro)
+
+- Shell: `docker run -it --rm ymuski/curl-http3 curl -ILv https://http3.yurets.pro/ --http3`

example.nginx.conf

@@ -20,7 +20,7 @@ http {
         server_name your_domain;
 
         # Add Alt-Svc header to negotiate HTTP/3.
-        add_header alt-svc 'h3-27=":443"; ma=86400, h3-28=":443"; ma=86400, h3-29=":443"; ma=86400';
+        add_header alt-svc 'h3-27=":443"; ma=86400, h3-28=":443"; ma=86400, h3-29=":443"; ma=86400, h3=":443"; ma=86400';
 
         return 301 https://$host$request_uri;
 
@@ -51,7 +51,7 @@ http {
         }
 
         # Add Alt-Svc header to negotiate HTTP/3.
-        add_header alt-svc 'h3-27=":443"; ma=86400, h3-28=":443"; ma=86400, h3-29=":443"; ma=86400';
+        add_header alt-svc 'h3-27=":443"; ma=86400, h3-28=":443"; ma=86400, h3-29=":443"; ma=86400, h3=":443"; ma=86400';
 
         location / {
             root   html;
@@ -61,6 +61,8 @@ http {
         location /host {
             return 200 "http3 on $hostname";
             add_header Content-Type text/plain;
+            # Add Alt-Svc header to negotiate HTTP/3.
+            add_header alt-svc 'h3-27=":443"; ma=86400, h3-28=":443"; ma=86400, h3-29=":443"; ma=86400, h3=":443"; ma=86400';
         }
 
     }