Q	A
Bug report?	yes
Feature request?	no
BC Break report?	maybe
RFC?	no
Symfony version	latest

I am creating a Laravel wrapper around @aidantwoods SecureHeaders package and am experiencing an issue with using Symfony\Component\HttpFoundation\ResponseHeaderBag::set() with a cookie.

The cookie I am trying to set has the attribute SameSite=Lax which comes from Aidan's package, which I then attempt to set but get the following InvalidArgumentException:

The "sameSite" parameter value is not valid.

This is because the check (

) references the Cookie::SAMESITE_LAX and Cookie::SAMESITE_STRICT constants which are both lowercase.

My suggestion would be to change this check to match case insensitively, but not sure how much of a breaking change this would be.

Would gladly submit a pull request for this!