Appstream URLs should not have the :// only the : Although they can work equally well with the // Discover requires the :// which is incorrect. The docs were misleading on this point and have no been updated https://www.freedesktop.org/software/appstream/docs/sect-AppStream-Services-URIHandler.html The buttons show in those docs are incorrect. I can currently using the :// on the kde.org/applications website but would like to make it correct.
"have now been updated" I mean
still an issue in 5.17
Git commit 4f2aa69241717a12e09bd49aba9ff78bd202960a by Aleix Pol. Committed on 28/10/2019 at 18:50. Pushed by apol into branch 'Plasma/5.17'. appstream: support more formats of appstream urls Centralises decoding of the urls into the same place. Uses both host and path to get the appstream id, since different people do it in different ways. M +5 -0 libdiscover/appstream/AppStreamUtils.cpp M +2 -0 libdiscover/appstream/AppStreamUtils.h M +4 -2 libdiscover/backends/FlatpakBackend/FlatpakBackend.cpp M +7 -8 libdiscover/backends/PackageKitBackend/PackageKitBackend.cpp M +2 -1 libdiscover/backends/SnapBackend/SnapBackend.cpp https://commits.kde.org/discover/4f2aa69241717a12e09bd49aba9ff78bd202960a