In these links the domain name is written in ASCII Compatible Encoding and the path is percent-encoded:
https://www.xn--rombobjrn-67a.se/packages/IRItest/l%C3%A4nk/gnat-srpm-macros-1-1/gnat-srpm-macros.spec
https://www.xn--rombobjrn-67a.se/packages/IRItest/l%C3%A4nk/gnat-srpm-macros-1-1/gnat-srpm-macros-1-1.fc20.src.rpm