Travis fetch test should not pass for revoked certificates #19330

Type: code issue

RT, see #19329 . Note that Firefox shows a Secure Connection Failed message when visiting https://revoked.badssl.com .

It seems fairly feasible to check the CSL and detect revoked certificate used by websites on Travis.

https://www.namecheap.com/support/knowledgebase/article.aspx/9968/38/how-to-check-the-certificate-revocation-status

The libcurl built-in checking is not very helpful, as it beaks all other checking.

Note that if this option is enabled but the server does not support the TLS extension, the verification will fail.

https://curl.haxx.se/libcurl/c/CURLOPT_SSL_VERIFYSTATUS.html