Use HTTP status code 303 instead of 307 for redirects

[leofeyer]

See #2096

[fritzmg]

Why the switch back to 302 for any redirects that use RedirectResponse directly? Now we have a mixture of 302 and 303 (again).

[leofeyer]

We just stick to the Symfony defaults. See symfony/symfony#10766 for the discussion.

[fritzmg]

We just stick to the Symfony defaults.

But shouldn't we use it for Controller::redirect too then? Now some parts of Contao's code base return 302 and some return 303. That does not make much sense to me, nor does it make sense to stick with 302 imho.

And the Symfony discussion is from over 6 years ago. As discussed elsewhere, browser support is not an issue any more.

[leofeyer]

The bottom line from the Symfony discussion (and https://stackoverflow.com/questions/5129076/after-a-post-should-i-do-a-302-or-a-303-redirect/5129148#5129148) is that is does not matter whether you send 302 or 303. We have updated our own methods to use 303, Symfony has decided to stick with 302. It still does not matter. 🤷🏻‍♂️

(If it really bothers you, you should create a PR to adjust the Symfony default status code.)