updated nginx config

gistfile1.txt

# setup a upstream point to CodiMD server
upstream @codimd {
    server 127.0.0.1:3000;
    keepalive 300;
}

# for socket.io (http upgrade)
map $http_upgrade $connection_upgrade {
    default upgrade;
    ''      close;
}

server {
        listen 80;
        listen [::]:80;
        server_name pad.noisebridge.info;
        return 302 https://pad.noisebridge.info$request_uri;
}

server {
  server_name pad.noisebridge.info;
    #listen [::]:443 ssl ipv6only=on; # managed by Certbot
    listen 443 ssl; # managed by Certbot

    ssl_certificate /etc/letsencrypt/live/noisebridge.info/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/noisebridge.info/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

    location / {
      proxy_http_version 1.1;
      
      # set header for proxy protocol
      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_set_header Upgrade $http_upgrade;
      proxy_set_header Connection $connection_upgrade;
                                           
      # setup for image upload
      client_max_body_size 8192m;
      proxy_max_temp_file_size 8192m;
                                                                   
      proxy_read_timeout 300;
      proxy_connect_timeout 300;
      proxy_pass http://@codimd;
  }
}