Pulp

$ checkbot --url https://docs.pulpproject.org/installation/instructions.html --verbose --match https://docs.pulpproject.org/installation/instructions.html
*** Starting Checkbot 1.80 in verbose mode
     GET https://docs.pulpproject.org/installation/instructions.html (text/html)
        Got 80 links (61 new) from document
*** Start writing results page
    Writing server docs.pulpproject.org (really 8.43.85.236)
=== Server docs.pulpproject.org is a Apache
*** Done writing result page
*** Moving queues around, 61 links to do.
    HEAD https://docs.pulpproject.org/_static/js/modernizr.min.js (application/javascript)
    HEAD https://docs.pulpproject.org/_static/documentation_options.js (application/javascript)
    HEAD https://docs.pulpproject.org/_static/jquery.js (application/javascript)
    HEAD https://docs.pulpproject.org/_static/underscore.js (application/javascript)
    HEAD https://docs.pulpproject.org/_static/doctools.js (application/javascript)
    HEAD https://docs.pulpproject.org/_static/language_data.js (application/javascript)
    HEAD https://docs.pulpproject.org/_static/js/theme.js (application/javascript)
    HEAD https://docs.pulpproject.org/_static/css/theme.css (text/css)
    HEAD https://docs.pulpproject.org/_static/pygments.css (text/css)
    HEAD https://docs.pulpproject.org/genindex.html (text/html)
    HEAD https://docs.pulpproject.org/search.html (text/html)
    HEAD https://docs.pulpproject.org/installation/configuration.html (text/html)
    HEAD https://docs.pulpproject.org/installation/index.html (text/html)
    HEAD https://docs.pulpproject.org/index.html (text/html)
    HEAD https://docs.pulpproject.org/concepts.html (text/html)
    HEAD https://docs.pulpproject.org/from-pulp-2.html (text/html)
    HEAD https://docs.pulpproject.org/components.html (text/html)
    HEAD https://docs.pulpproject.org/installation/storage.html (text/html)
    HEAD https://docs.pulpproject.org/installation/authentication.html (text/html)
    HEAD https://docs.pulpproject.org/settings.html (text/html)
    HEAD https://docs.pulpproject.org/workflows/index.html (text/html)
    HEAD https://docs.pulpproject.org/plugins/index.html (text/html)
    HEAD https://docs.pulpproject.org/rest_api.html (text/html)
    HEAD https://docs.pulpproject.org/client_bindings.html (text/html)
    HEAD https://docs.pulpproject.org/contributing/index.html (text/html)
    HEAD https://docs.pulpproject.org/bugs-features.html (text/html)
    HEAD https://docs.pulpproject.org/glossary.html (text/html)
    HEAD https://docs.pulpproject.org/changes.html (text/html)
    HEAD https://docs.pulpproject.org/versioning.html (text/html)
    HEAD https://docs.pulpproject.org/_sources/installation/instructions.rst.txt (text/plain)
    HEAD https://pulp.plan.io/issues/3809 (application/octet-stream)
    HEAD https://pulp.plan.io/issues/97 (application/octet-stream)
    HEAD https://github.com/pulp/pulp_installer/ (text/html)
    HEAD http://postgresguide.com/setup/install.html (text/html)
    HEAD https://docs.djangoproject.com/en/2.2/ref/settings/ (text/html)
    HEAD https://redis.io/download (application/octet-stream)
        404 Not Found
    HEAD https://github.com/pulp/pulp_installer/blob/master/roles/pulp-content/templates/pulpcore-content.service.j2 (application/octet-stream)
        404 Not Found
    HEAD https://github.com/pulp/pulp_installer/tree/master/roles/pulp-content (application/octet-stream)
        404 Not Found
    HEAD https://github.com/pulp/pulp_installer/blob/master/roles/pulp/templates/pulpcore-api.service.j2 (application/octet-stream)
    HEAD https://github.com/pulp/pulp_installer/blob/master/roles/pulp-workers/templates/pulpcore-worker%40.service.j2 (application/octet-stream)
        404 Not Found
    HEAD https://github.com/pulp/pulp_installer/tree/master/roles/pulp-workers (application/octet-stream)
        404 Not Found
    HEAD https://github.com/pulp/pulp_installer/blob/master/roles/pulp-resource-manager/templates/pulpcore-resource-manager.service.j2 (application/octet-stream)
        404 Not Found
    HEAD https://github.com/pulp/pulp_installer/tree/master/roles/pulp-resource-manager (application/octet-stream)
        404 Not Found
    HEAD http://sphinx-doc.org/ (text/html)
        302 Moved Temporarily
    HEAD https://github.com/rtfd/sphinx_rtd_theme (application/octet-stream)
        301 Moved Permanently
    HEAD https://readthedocs.org/ (text/html)
*** Moving queues around, 0 links to do.
    Removed temporary directory /tmp/Checkbot.23918 and its contents.
*** Start writing results page
    Writing server docs.pulpproject.org (really 8.43.85.236)
*** Done writing result page

The Redis one is weird because via curl it does give a 404 but in the browser it's a HTTP 200.