nginx.conf

server {
    listen 80 default_server;
    server_name _;
    return 301 https://$host$request_uri;
}

map $http_x_forwarded_proto $proxy_x_forwarded_proto {
  default $http_x_forwarded_proto;
  ''      $scheme;
}

server {
    listen 443 ssl http2;

    ssl_certificate /cert/cert.pem;
    ssl_certificate_key /cert/key-no-password.pem;
    ssl_session_timeout 5m;
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    ssl_ciphers HIGH:MEDIUM:!SSLv2:!PSK:!SRP:!ADH:!AECDH;
    ssl_prefer_server_ciphers on;

    location ~* ^/(app|main|login|keys|sessionTimeout|invalidToken)$ {
        proxy_pass http://mattermost-lti:3001;
        proxy_http_version 1.1;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $http_connection;
        access_log off;
    }

    location /lti/ {
        proxy_pass http://mattermost-lti:3002/;
        proxy_http_version 1.1;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $http_connection;
        access_log off;
    }

    location ~ /api/v[0-9]+/(users/)?websocket$ {
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header X-Forwarded-Ssl on;
        proxy_set_header Connection "upgrade";

        client_max_body_size 50M;
        proxy_set_header Host $http_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 $proxy_x_forwarded_proto;
        proxy_hide_header Content-Security-Policy;
        proxy_hide_header X-Frame-Options;
        proxy_buffers 256 16k;
        proxy_buffer_size 16k;
        proxy_read_timeout 600s;
        proxy_pass http://app:8065;
    }

    location / {
        gzip on;
        proxy_set_header X-Forwarded-Ssl on;

        client_max_body_size 50M;
        proxy_set_header Connection "";
        proxy_set_header Host $http_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 $proxy_x_forwarded_proto;
        proxy_hide_header Content-Security-Policy;
        proxy_hide_header X-Frame-Options;
        proxy_buffers 256 16k;
        proxy_buffer_size 16k;
        proxy_read_timeout 600s;
        proxy_pass http://app:8065;
    }
}