nginx action cable error

curl.sh

curl -i -N -H "Connection: Upgrade" -H "Upgrade: websocket" -H "Host: portal.example.com.au" -H "Origin: https://portal.example.com.au" https://portal.example.com.au/cable

HTTP/1.1 301 Moved Permanently
Server: nginx/1.10.3 (Ubuntu)
Date: Thu, 15 Oct 2020 14:33:10 GMT
Content-Type: text/html
Transfer-Encoding: chunked
Connection: keep-alive
Location: https://portal.example.com.au/cable

nginx.conf

upstream puma_portal {
  server unix:///home/example/apps/portal/shared/tmp/sockets/portal-puma.sock;
}

server {
  server_name portal.example.com.au;

  root /home/example/apps/portal/current/public;
  try_files $uri/index.html $uri.html $uri @puma_portal;

  location @puma_portal {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header Host $http_host;
    proxy_redirect off;
    proxy_read_timeout 300;
    proxy_pass http://puma_portal;
  }

  location /cable {
    proxy_pass http://puma_portal/portal;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header Host $http_host;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "Upgrade";
  }

  location ~ ^/assets/ {
    gzip_static on;
    expires max;
    root /home/example/apps/portal/current/public;
    add_header Cache-Control public;
    add_header Last-Modified "";
    add_header ETag "";
    break;
  }

  error_page 500 502 503 504 /500.html;
  client_max_body_size 4G;
  keepalive_timeout 10;

  listen 443 ssl; # managed by Certbot
  ssl_certificate /etc/letsencrypt/live/portal.example.com.au/fullchain.pem; # managed by Certbot
  ssl_certificate_key /etc/letsencrypt/live/portal.example.com.au/privkey.pem; # managed by Certbot
}