env/hedgedoc/nginx.conf

map $http_upgrade $connection_upgrade {
        default upgrade;
        ''      close;
}

server {
	server_name ${HEDGEDOC_HOSTNAME} ${HEDGEDOC_HOSTNAME}.${DOMAIN_NAME};
	client_max_body_size 128m;

	sendfile on;
	tcp_nopush on;
	tcp_nodelay on;
	keepalive_timeout 65;
	types_hash_max_size 2048;
	#include /etc/nginx/mime.types;
	#default_type application/octet-stream;

	gzip on;
	gzip_disable "msie6";

	proxy_read_timeout 1800s;

	proxy_cache mycache;
	proxy_cache_valid any 1m;
	add_header X-Cache-Status $upstream_cache_status;

	# required to avoid HTTP 411: see Issue #1486 (https://github.com/dotcloud/docker/issues/1486)
	chunked_transfer_encoding on;

	location / {
		proxy_pass http://hedgedoc:3000;
		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;
	}

	# allow the fonts to be used by anything
	location ~* \.(eot|otf|ttf|woff|woff2)$ {
		add_header Access-Control-Allow-Origin *;
		proxy_pass http://hedgedoc:3000;
		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;
	}

	# websocket traffic with extra headers for upgrading the connection
        location /socket.io/ {
                proxy_pass http://hedgedoc:3000;
                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;
        }

	listen 443 ssl;
	ssl_certificate /etc/letsencrypt/live/${DOMAIN_NAME}/fullchain.pem;
	ssl_certificate_key /etc/letsencrypt/live/${DOMAIN_NAME}/privkey.pem;
	include /etc/nginx/includes/options-ssl-nginx.conf;
	include /etc/nginx/includes/challenge.conf;
	ssl_dhparam /etc/nginx/includes/ssl-dhparams.pem;
}