matrix-docker-ansible-deploy/roles/matrix-server/templates/nginx-conf.d/matrix-synapse.conf.j2

server {
	listen 80;
	server_name {{ hostname_matrix }};

	server_tokens off;

	location /.well-known/acme-challenge {
		default_type "text/plain";
		alias /acmetool-certs/run/acme-challenge;
	}

	location / {
		return 301 https://$http_host$request_uri;
	}
}

server {
	listen 443 ssl http2;
	listen [::]:443 ssl http2;

	server_name {{ hostname_matrix }};

	server_tokens off;
	root /dev/null;

	ssl on;
	ssl_certificate /acmetool-certs/live/{{ hostname_matrix }}/fullchain;
	ssl_certificate_key /acmetool-certs/live/{{ hostname_matrix }}/privkey;
	ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
	ssl_prefer_server_ciphers on;
	ssl_ciphers "EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH";

	location /_matrix {
		proxy_pass http://synapse:8008;
		proxy_set_header X-Forwarded-For $remote_addr;

		# These are intentionally large.
		# Note that Synapse enforces its own limits, which are smaller.
		client_body_buffer_size 25M;
		client_max_body_size 100M;
		proxy_max_temp_file_size 0;
	}
}