Nice example (thanks bochecha): https://github.com/Cangjians/libcangjie/releases/tag/v1.3 "libcangjie..." URL are valid, as created by uptream https://github.com/Cangjians/libcangjie/releases/download/v1.3/libcangjie-1.3.tar.xz "Source code" URL are NOT immutable, so not valid. https://github.com/Cangjians/libcangjie/archive/v1.3.tar.gz Remi.