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Stefan Hornburg (Racke) authored
This prevents confusion seen at: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=929157#15 https://github.com/sympa-community/sympa/issues/876#issuecomment-590156276 Even better to have a format that checks whether it is a valid URL. E.g. by feeding it to the URI module and verify that all vital parts are present.