* https://github.com/mozilla/http-observatory/blob/main/httpobs/scanner/analyzer/headers.py * https://github.com/mozilla/http-observatory/blob/main/httpobs/tests/unittests/test_csp_parser.py * https://github.com/mozilla/http-observatory/blob/main/httpobs/tests/unittests/test_parse_http_equiv_headers.py
