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kshitijrajsharma
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Fixes HTTP 403 errors affecting map tile loading and export creation.
Root cause: Django's SecurityMiddleware was stripping the Referer header on cross-origin requests (default same-origin policy), and the browser was sending an Origin header on tile requests — both of which OSM tile servers reject with 403. Additionally, SessionAuthentication in DRF was causing CSRF-based 403s on API requests.
Changes:
Sets SECURE_REFERRER_POLICY = "strict-origin-when-cross-origin" so the Referer header is preserved on cross-origin requests, satisfying OSM's tile policy.
Adds crossOrigin: null to the OSM tile layer to prevent the browser from sending an Origin header on tile requests.
Removes SessionAuthentication from DRF's authentication classes to eliminate CSRF-based 403s.