Provide references for CVE-2021-21240.
Where can I find more information about CVE-2021-21240?
References are available at: https://github.com/httplib2/httplib2/security/advisories/GHSA-93xj-8mrv-444m, https://github.com/httplib2/httplib2/pull/182, https://github.com/httplib2/httplib2/commit/bd9ee252c8f099608019709e22c0d705e98d26bc, https://pypi.org/project/httplib2.