Comment 5 for bug 143352

Will be fixed in 2.13.20:
https://github.com/zopefoundation/Zope/commit/1b373937f9557f14d07d938d2e927bfebf2d75ee

I did not use the patch, instead I adapted it to also take care of the trusted-proxy settings.
So for this to have any effect, trusted-proxy must be set properly