Description of problem:

I attempted to configure my Redhat 7.3 workstation for DNF using the directions found at this website: 

http://dnf.baseurl.org/2016/07/01/fresh-dnf-for-rhel-7-and-centos-7/

the directions lead to: https://copr-be.cloud.fedoraproject.org/results/@rpm-software-management/dnf-stack-el7/epel-7-\$basearch/

Which appears to have moved.  So in an attempt to improvise I used  

https://copr-be.cloud.fedoraproject.org/results/%40rpm-software-management/minimal/epel-7-x86_64/repodata/repomd.xml

To which result I got:

Failed to synchronize cache for repo 'rhel-7-workstation-rh-common-rpms' from 'https://cdn.redhat.com/content/dist/rhel/workstation/7/7.3/x86_64/rh-common/os': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried, disabling.

Version-Release number of selected component (if applicable):

epel-7-x86_64


How reproducible:

Easily

Steps to Reproduce:
1.
2.
3.

Actual results:
Failed to synchronize cache for repo 'rhel-7-workstation-rh-common-rpms' from 'https://cdn.redhat.com/content/dist/rhel/workstation/7/7.3/x86_64/rh-common/os': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried, disabling.
Failed to synchronize cache for repo 'rhel-7-workstation-optional-rpms' from 'https://cdn.redhat.com/content/dist/rhel/workstation/7/7.3/x86_64/optional/os': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried, disabling.
Docker CE Stable - x86_64                        24 kB/s | 4.3 kB     00:00    
Failed to synchronize cache for repo 'dnf-stack-el7' from 'https://copr-be.cloud.fedoraproject.org/results/%40rpm-software-management/minimal/epel-7-x86_64/repodata/repomd.xml': Yum repo downloading error: Downloading error(s): repodata/669653ba4205d77ec64e32e1e6101d80973391c355ba90415d2451564457975c-primary.xml.gz - Cannot download, all mirrors were already tried without success; repodata/80eb8d421922f8ee2967bd203adcce60ea44026db18eed56a62ca9da97a8cb18-filelists.xml.gz - Cannot download, all mirrors were already tried without success, disabling.
Nux.Ro RPMs for general desktop use                                                                                 897 kB/s | 3.7 MB     00:04    
Adobe Systems Incorporated                                                                                          9.4 kB/s | 1.9 kB     00:00    
Failed to synchronize cache for repo 'rhel-7-workstation-extras-rpms' from 'https://cdn.redhat.com/content/dist/rhel/workstation/7/7Workstation/x86_64/extras/os': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried, disabling.
Failed to synchronize cache for repo 'rhel-7-workstation-supplementary-rpms' from 'https://cdn.redhat.com/content/dist/rhel/workstation/7/7.3/x86_64/supplementary/os': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried, disabling.
Docker CE Edge - x86_64                                                                                              18 kB/s | 3.9 kB     00:00    
Failed to synchronize cache for repo 'rhel-7-workstation-rpms' from 'https://cdn.redhat.com/content/dist/rhel/workstation/7/7.3/x86_64/os': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried, disabling.


Expected results:
repo id                                             repo name                                                                                 status
adobe-linux-x86_64                                  Adobe Systems Incorporated                                                                     3
docker-ce-edge                                      Docker CE Edge - x86_64                                                                        5
docker-ce-stable                                    Docker CE Stable - x86_64                                                                      7
*epel                                               Extra Packages for Enterprise Linux 7 - x86_64                                            11,929
*epel-debuginfo                                     Extra Packages for Enterprise Linux 7 - x86_64 - Debug                                     2,639
*epel-source                                        Extra Packages for Enterprise Linux 7 - x86_64 - Source                                    6,330
nux-dextop                                          Nux.Ro RPMs for general desktop use                                                        2,475

Additional info:

Why can't I find the baseurl at dnf.readthedocs.io?