I recently discovered the Mozilla Observatory service:
The Mozilla HTTP Observatory is a set of tools to analyze your website and inform you if you are utilizing the many available methods to secure it.
BeforeInitially the 3 websites https://muscle.apdu.fr/, https://ccid.apdu.fr/ and https://pcsclite.apdu.fr/ I manage had a very bad score of F or 20/100.
F is is worst score. So I needed to do something to improve the situation and the security a bit.