Support POST method for ServerRedirectStrategy

[sjohnr]

This is the reactive counterpart to gh-13002. See gh-16214.

[franticticktick]

Hi @sjohnr, could you assign this ticket to me please?

[kiruthiga1793]

Hi @sjohnr , I am also interested if you need additional hands.

[sjohnr]

Thanks folks, you are quick! I'll assign to @franticticktick but please feel free to review and give feedback, @kiruthiga1793.

[franticticktick]

@sjohnr I noticed that in OidcClientInitiatedServerLogoutSuccessHandler redirectStrategy this is a final field. I can remove final in a separate commit and add setRedirectStrategy, otherwise ServerFormPostRedirectStrategy doesn’t make much sense.

[sjohnr]

Thanks for pointing that out, @franticticktick. I think it might be nice to have that enhancement tracked in either a separate issue or a separate PR so that it shows up as its own line in release notes. A PR is enough, so feel free to open one for that and reference this issue.