Solved Cookie token creation for requests#549
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Server (CsrfCookieFilter) → Set-Cookie: XSRF-TOKEN → browser stores it
browser (api.ts) → reads cookie, sets header → X-XSRF-TOKEN on POST
Server (CsrfFilter) → header == cookie? → yes → allow
The reason the filter was needed is that without it the server never issued the cookie in the first place, so the frontend had nothing to read and copy onto the request. The filter supplies the token (via a response cookie) and the frontend is what actually attaches it to requests.
This also directly solved issue #548