The PDF_RENDER_SERVICE_CALLBACK_BASE_URL variable is the URL where the PDF Render Service invokes callbacks when LogScale makes a request from the service.

When a request is sent from LogScale to the auxiliary PDF Render Service, it contains a three callback URL for the service to use to fetch the report from LogScale and then subsequently reply back to LogScale with either a failure, or on success a reply containing the generated PDF file.

Previously the PUBLIC_URL configuration variable has been used to generate these callback URLs. However, for customers who prefer to keep the URLs within their cluster, PDF_RENDER_SERVICE_CALLBACK_BASE_URL can be configured.

An example is shown here:

PDF_RENDER_SERVICE_CALLBACK_BASE_URL=https://humio.mycompany.net/internal

If LogScale is deployed in multi-organization mode, the callback URL goes through the same rules of formatting as described for PUBLIC_URL.

If PDF_RENDER_SERVICE_CALLBACK_BASE_URL is not configured then PUBLIC_URL is used to generate the callback URLs.