HTTP/3 not works and fallback to HTTP/2

[dalisoft]

Config

static.conf

server {
    listen 443 http3 reuseport;
    listen 443 ssl http2;

    server_name _;

    ssl_certificate /etc/nginx/ssl/cert.pem;
    ssl_certificate_key /etc/nginx/ssl/privkey.pem;
    ssl_trusted_certificate /etc/nginx/ssl/fullchain.pem;

    # Enable all TLS versions (TLSv1.3 is required for QUIC).
    ssl_protocols TLSv1.3;

    # 0-RTT QUIC connection resumption
    ssl_early_data on;

    # Add Alt-Svc header to negotiate HTTP/3.
    add_header alt-svc 'h3-27=":4300"; ma=86400, h3-28=":4300"; ma=86400, h3-29=":4300"; ma=86400';
    add_header QUIC-Status $http3; # Sent when QUIC was used

    # resolver 127.0.0.11;
    autoindex off;

    root /usr/share/nginx/html;
    index index.html;

    # limit_req zone=perip burst=5 nodelay;
    # limit_req_status 460;
    # limit_conn perserver 5;
    # limit_rate 10240k;
}

docker-compose.yml

version: "3.8"

services:
  ssb-http3:
    image: macbre/nginx-http3
    container_name: docker-ssb-demo
    restart: always
    ports:
      - "0.0.0.0:4300:443/tcp"
      - "0.0.0.0:4300:443/udp"
    environment:
      - "NODE_ENV=development"
    networks:
      - demo-connect
    volumes:
      # - ./nginx/nginx.conf:/etc/nginx/nginx.conf:ro
      - ./nginx/static.conf:/etc/nginx/conf.d/static.conf:ro
      - ./static:/usr/share/nginx/html
      - ./ssl:/etc/nginx/ssl

networks:
  demo-connect:
    driver: bridge

Checks

ubuntu@ubuntu-vm:~/Documents/ssb$ docker-compose ps
     Name               Command          State                                Ports                              
-----------------------------------------------------------------------------------------------------------------
docker-ssb-demo   nginx -g daemon off;   Up      0.0.0.0:4300->443/tcp, 0.0.0.0:4300->443/udp, 8080/tcp, 8443/tcp


ubuntu@ubuntu-vm:~/Documents/ssb$ docker run -it --rm ymuski/curl-http3 curl -ILv https://localhost.dalisoft.uz:4300 --http3
*   Trying 127.0.0.1:4300...
* Connect socket 5 over QUIC to 127.0.0.1:4300
* Sent QUIC client Initial, ALPN: h3-29,h3-28,h3-27
* quiche: recv() unexpectedly returned -1 (errno: 111, socket 5)
* connect to 127.0.0.1 port 4300 failed: Connection refused
* Failed to connect to localhost.dalisoft.uz port 4300: Connection refused
* Closing connection 0
curl: (7) quiche: recv() unexpectedly returned -1 (errno: 111, socket 5)
ubuntu@ubuntu-vm:~/Documents/ssb$ 

Environments

• docker macbre/nginx-http3 latest
• os ubuntu 22.04 (amd64)

Expected Result

HTTP/3 responses

Actual Result