xdg-utils use KDE native tools to open URLs. In your case, kde-open5 is invoked which hangs on networking request and than fails. More clear example:
$ kde-open5 http://192.0.2.42:8080/
xdg-utils use KDE native tools to open URLs. In your case, kde-open5 is invoked which hangs on networking request and than fails. More clear example:
$ kde-open5 http:// 192.0.2. 42:8080/