nginx template with map for Forwarded Header per RFC 7239

nginx with forwarded

map $remote_addr $proxy_forwarded_elem {
    # IPv4 addresses can be sent as-is
    ~^[0-9.]+$          "for=$remote_addr";

    # IPv6 addresses need to be bracketed and quoted
    ~^[0-9A-Fa-f:.]+$   "for=\"[$remote_addr]\"";

    # Unix domain socket names cannot be represented in RFC 7239 syntax
    default             "for=unknown";
}

map $http_forwarded $proxy_add_forwarded {
    # If the incoming Forwarded header is syntactically valid, append to it
    "~^(,[ \\t]*)*([!#$%&'*+.^_`|~0-9A-Za-z-]+=([!#$%&'*+.^_`|~0-9A-Za-z-]+|\"([\\t \\x21\\x23-\\x5B\\x5D-\\x7E\\x80-\\xFF]|\\\\[\\t \\x21-\\x7E\\x80-\\xFF])*\"))?(;([!#$%&'*+.^_`|~0-9A-Za-z-]+=([!#$%&'*+.^_`|~0-9A-Za-z-]+|\"([\\t \\x21\\x23-\\x5B\\x5D-\\x7E\\x80-\\xFF]|\\\\[\\t \\x21-\\x7E\\x80-\\xFF])*\"))?)*([ \\t]*,([ \\t]*([!#$%&'*+.^_`|~0-9A-Za-z-]+=([!#$%&'*+.^_`|~0-9A-Za-z-]+|\"([\\t \\x21\\x23-\\x5B\\x5D-\\x7E\\x80-\\xFF]|\\\\[\\t \\x21-\\x7E\\x80-\\xFF])*\"))?(;([!#$%&'*+.^_`|~0-9A-Za-z-]+=([!#$%&'*+.^_`|~0-9A-Za-z-]+|\"([\\t \\x21\\x23-\\x5B\\x5D-\\x7E\\x80-\\xFF]|\\\\[\\t \\x21-\\x7E\\x80-\\xFF])*\"))?)*)?)*$" "$http_forwarded, $proxy_forwarded_elem";

    # Otherwise, replace it
    default "$proxy_forwarded_elem";
}

upstream servicename {
    server localhost:5000;
}

server {
        listen 80;
        listen [::]:80;
        server_name service.name.example.org;
        return 301 https://$host$request_uri;
}

server {
      listen 443 ssl;
      listen [::]:443 ssl;
      server_name service.name.example.org;
      ssl_certificate /etc/letsencrypt/live/service.name.example.org/fullchain.pem;
      ssl_certificate_key /etc/letsencrypt/live/service.name.example.org/privkey.pem;

      charset     utf-8;

      client_max_body_size 75M;

      location / {
                proxy_pass http://servicename;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection 'upgrade';
                proxy_set_header Host $host;
                proxy_set_header Forwarded "$proxy_add_forwarded;proto=$scheme";
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-Proto $scheme;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_cache_bypass $http_upgrade;
      }
}