See http://koji.fedoraproject.org/koji/taskinfo?taskID=3794163 for an example task:
{{{
DEBUG util.py:257: http://kojipkgs.fedoraproject.org/repo/rhel/rhel-x86_64-as-4/getPackage/glibc-2.3.4-2.54.x86_64.rpm: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404"
DEBUG util.py:257: Trying other mirror.
DEBUG util.py:257: http://kojipkgs.fedoraproject.org/repo/rhel/rhel-x86_64-as-4/getPackage/glibc-common-2.3.4-2.54.x86_64.rpm: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404"
DEBUG util.py:257: Trying other mirror.
DEBUG util.py:257: http://kojipkgs.fedoraproject.org/repo/rhel/rhel-x86_64-as-4/getPackage/glibc-devel-2.3.4-2.54.x86_64.rpm: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404"
DEBUG util.py:257: Trying other mirror.
DEBUG util.py:257: http://kojipkgs.fedoraproject.org/repo/rhel/rhel-x86_64-as-4/getPackage/glibc-headers-2.3.4-2.54.x86_64.rpm: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404"
DEBUG util.py:257: Trying other mirror.
DEBUG util.py:257: Error Downloading Packages:
DEBUG util.py:257: glibc-devel-2.3.4-2.54.x86_64: failed to retrieve glibc-devel-2.3.4-2.54.x86_64.rpm from build
DEBUG util.py:257: error was [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404"
DEBUG util.py:257: glibc-2.3.4-2.54.x86_64: failed to retrieve glibc-2.3.4-2.54.x86_64.rpm from build
DEBUG util.py:257: error was [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404"
DEBUG util.py:257: glibc-headers-2.3.4-2.54.x86_64: failed to retrieve glibc-headers-2.3.4-2.54.x86_64.rpm from build
DEBUG util.py:257: error was [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404"
DEBUG util.py:257: glibc-common-2.3.4-2.54.x86_64: failed to retrieve glibc-common-2.3.4-2.54.x86_64.rpm from build
DEBUG util.py:257: error was [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404"
}}}