$ dnf install @httpd Loading repositories. Last metadata expiration check: 2:43:05 ago on Fri 29 Sep 2017 12:54:30 PM UTC. Warning: Group 'httpd' does not exist. Error: Nothing to do. The message is misleading and needs to be replaced. For example: $ dnf install @foo -> Module or group 'foo' doesn't exist. $ dnf install @httpd -> Module 'httpd' has no default stream. Please specify a stream. $ dnf install @httpd:2.6 -> Module 'httpd', stream '2.6' doesn't exist. etc.
*** Bug 1497281 has been marked as a duplicate of this bug. ***
Fixed by https://github.com/rpm-software-management/dnf/pull/942
The issue is solved by dnf-3.0.1-1 that was released into rawhide.