In the case of non resolution (https://doesnotexists.com for instance) we have a blank message instead of an error stating the impossibility to resolve the domain name.
I have nothing for invalid url (no error, no success, just blank). Tried with https://doesnotexist.example.com/ or with https://doesnotexist.t
Campaign Tuleap 12.9 - Non regression
Test summary Webhooks
Test description