Merge pull request #14952 from nextcloud/enh/14179/api_csp

lib/public/AppFramework/Http/DataDisplayResponse.php

lib/public/AppFramework/Http/DataResponse.php

lib/public/AppFramework/Http/DownloadResponse.php

lib/public/AppFramework/Http/FileDisplayResponse.php

lib/public/AppFramework/Http/JSONResponse.php

lib/public/AppFramework/Http/NotFoundResponse.php

lib/public/AppFramework/Http/OCSResponse.php

lib/public/AppFramework/Http/RedirectResponse.php

lib/public/AppFramework/Http/Response.php

lib/public/AppFramework/Http/StreamResponse.php

lib/public/AppFramework/Http/TemplateResponse.php

lib/public/AppFramework/Http/ZipResponse.php

tests/lib/AppFramework/Controller/ControllerTest.php

tests/lib/AppFramework/Http/DataResponseTest.php

tests/lib/AppFramework/Http/ResponseTest.php