Generated pages are blank when SECURE_SSL_REDIRECT is enabled #24
Description
It is sometimes required to set SECURE_SSL_REDIRECT to True in the settings (e.g. you can't force the redirection before the request reaches Django). When you do so however, the generated pages will be completely blank.
This is because the request is not set as secure:
https://github.com/moorinteractive/wagtail-bakery/blob/4c2979956a9601ffd25811314e90b31f713e60c6/src/wagtailbakery/views.py#L91-L92
Which returns a HttpResponsePermanentRedirect which isn't handled (it reaches the 3rd if branch where reponse.content is b''):
https://github.com/moorinteractive/wagtail-bakery/blob/4c2979956a9601ffd25811314e90b31f713e60c6/src/wagtailbakery/views.py#L31-L40
While there might be some discussions to have on how a HttpResponsePermanentRedirect should be handled, I reckon this is for another issue and that the right fix here is to set the request as secure. I'll open a PR shortly.