Nginx Reverse Proxy для FastAPI и Uvicorn: WebSocket, асинхронные ответы и SSL

# /etc/nginx/sites-available/api.example.com.conf
upstream uvicorn_cluster {
    server 127.0.0.1:8000;
    server 127.0.0.1:8001;
    keepalive 32;
}

server {
    listen 80;
    server_name api.example.com;
    return 301 https://api.example.com$request_uri;
}

server {
    listen 443 ssl http2;
    server_name api.example.com;

    ssl_certificate /etc/letsencrypt/live/api.example.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/api.example.com/privkey.pem;

    client_max_body_size 32M;

    location / {
        proxy_pass http://uvicorn_cluster;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_buffering on;
        proxy_buffers 32 16k;
        proxy_busy_buffers_size 64k;
        proxy_read_timeout 120s;
    }
}