Mixed content - Request from an insecure resource
When I try to print some document the odoo tries to generate the PDF using the Wkhtmltopdf. But right after I get this error:
Mixed Content: The page at 'https://' was loaded over HTTPS, but requested an insecure resource 'http://'. This request has been blocked; the content must be served over HTTPS.
I've configure the nginx webserver to use SSL with Let's Encrypt certificate. Everything looks fine, until I get this request over http instead of https. Why this is happening? How should I fix this?
I have already tried to update the web.base.url to https:// instead of http:// and I've also created the paramenter web.base.url.freeze and assigned to True. But that did not fix this issue. I still get that request from http.