This is funny, just wrote post on a same topic: https://zarkzork.com/code-reading.html

Thanks, I will look into this. After running ssl test from ssl labs and I some alarming issues https://www.ssllabs.com/ssltest/analyze.html?d=zarkzork.com I should have done it earlier

Surprisingly, I get this fairly often on my mobile. I'm not quite sure what's changed with the last version (or couple) of Android to trigger this. Over-secure, perhaps?

Android mobile browser requires the full signature chain of authorities who signed the site certificate[0]. It is done to avoid calls to CA servers and reduce network use on mobile devices.

If a person does not concatenate authorities signatures to their site certificate, Firefox and mobile Chrome will alert, desktop Chrome and Safari won't.

[0] https://en.wikipedia.org/wiki/OCSP_stapling

Great format! And Ruby source is good for learning C. I really got into it with Matz ruby source code.

For anyone intersted how Ruby parser works, I've written small article about patching ruby syntax: https://zarkzork.com/extending-ruby.html