Host Chronik

Use a reverse proxy such as Apache or NGINX in front of Chronik.

NGINX

Install NGINX — on Ubuntu:

sudo apt update
sudo apt install nginx

Example: serve Chronik under /xec:

server {
    server_name chronik.yourapp.com;

    location /xec/ {
        proxy_pass http://127.0.0.1:8331/;
        proxy_set_header Host $http_host;
        add_header "Access-Control-Allow-Origin"  *;
        add_header "Access-Control-Allow-Methods" "GET, POST, OPTIONS, HEAD";
    }

    location /xec/ws {
        proxy_pass http://127.0.0.1:8331/ws;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "Upgrade";
    }
}

HTTPS

Use Certbot with NGINX:

certbot --nginx -d chronik.yourapp.com

When prompted about redirects, choosing “yes” is usually best.