Using Reverse Proxiesedit

If your Kibana instance requires a reverse-proxy (NGINX, Apache, etc.) for access, because of rewrite rules or special headers being added by the proxy, then you need to configure the xpack.reporting.kibanaServer settings to make the headless browser process connect to the proxy in Kibana server settings.

A headless browser runs on the Kibana server to open a Kibana page for capturing screenshots. Configuring the xpack.reporting.kibanaServer settings to point to a proxy host requires that the Kibana server has network access to the proxy.