Overriding the ETAG decorator for wagtail document's serve method

patches.py

################################################################################################################
# Replace the wagtaildocs serve() view to change the cache-control header that it returns.
# This prevents any cache besides the user's own browser from storing any potentially confidential document.
################################################################################################################
multitenant_document_serve = etag(document_etag)(cache_control(max_age=3600, private=True)(serve.__wrapped__))


patched_wagtail_urlpatterns = [
    # This overrides the wagtaildocs_serve view.
    re_path(r'^documents/(\d+)/(.*)$', multitenant_document_serve),
]

#### and then in our urls.py file, we prepend the normal patterns with the patch list

# We override several /admin/* URLs with our own custom views, which are defined in patched_wagtail_urlpatterns.
urlpatterns = patched_wagtail_urlpatterns + [
    # Serve the usual django admin interface from /django-admin/, because Wagtail takes /admin/.
    path('django-admin/', include(django_admin.site.urls[:2], namespace=django_admin.site.name)),
    
    # We now include wagtails' own admin URLs.
    path('admin/', include('wagtail.admin.urls')),

    # These are the URLs Wagtail serves documents from.
    path('documents/', include('wagtail.documents.urls')),

    # Public URLs for our custom apps.
    # etc
]