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 {
		{#
			The proxy can access the files directly.
			An external server likely does not have permission to read these files,
			so we'll just proxy to acme's :402 port.
		#}

		{%- if matrix_nginx_proxy_enabled -%}
		default_type "text/plain";
		alias {{ matrix_ssl_certs_path }}/run/acme-challenge;
		{%- else -%}
		proxy_pass http://localhost:402;
		{% endif %}
	}

	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_certificate {{ matrix_ssl_certs_path }}/live/{{ hostname_matrix }}/fullchain;
	ssl_certificate_key {{ matrix_ssl_certs_path }}/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 {
		{% if matrix_nginx_proxy_enabled %}
			{# Use the embedded DNS resolver in Docker containers to discover the service #}
			resolver 127.0.0.11 valid=5s;
			set $backend "matrix-synapse:8008";
			proxy_pass http://$backend;
		{% else %}
			{# Generic configuration for people to use outside of our container setup #}
			proxy_pass http://localhost:8008;
		{% endif %}

		proxy_set_header X-Forwarded-For $remote_addr;

		client_body_buffer_size 25M;
		client_max_body_size {{ matrix_max_upload_size_mb }}M;
		proxy_max_temp_file_size 0;
	}
}