RSS feed validation

[Lucas-C]

Hello.

I checked Shaarli RSS stream with the W3C validor out of curiosity, and I got 2 minor warnings:
https://validator.w3.org/feed/check.cgi?url=https%3A%2F%2Fchezsoi.org%2Fshaarli%2F%3Fdo%3Datom

• self reference doesn't match document location: because of HTTP vs HTTPS
• label should not contain HTML: because of the escaped &

I'm going to look at it

[Lucas-C]

I fixed a few error & warnings, but some warnings remain that I don't see how to fix:

• https://validator.w3.org/feed/check.cgi?url=https%3A%2F%2Fchezsoi.org%2Fshaarli%2F%3Fdo%3Datom%26clear-cache
• https://validator.w3.org/feed/check.cgi?url=https%3A%2F%2Fchezsoi.org%2Fshaarli%2F%3Fdo%3Drss%26clear-cache

If do not use htmlspecialchars, the inserted strings can contain breaking characters (or an & that is not allowed by the validator), and using <CDATA[[ is not supported by all the validators I tested.

IHMO it is OK that way

[Lucas-C]

And for the "self reference doesn't match document location" warning, it was just a matter of using proxy_set_header X-Forwarded-Proto $scheme in my nginx configuration