update to h3-27

example.nginx.conf

@@ -39,8 +39,11 @@ http {
                 return 404;
         }
         
+        # Request buffering in not currently supported for HTTP/3.
+        proxy_request_buffering off;
+
         # Add Alt-Svc header to negotiate HTTP/3.
-        add_header alt-svc 'h3-24=":443"; ma=86400, h3-23=":443"; ma=86400';
+        add_header alt-svc 'h3-27=":443"; ma=86400';
 
         location / {
             root   html;