New requests to external apps are unauthenticated

[ishank011]

If I try to open a file in an external app by directly copy-pasting a URL in the browser (authentication is provided by keycloak), there's no redirection to keycloak so the corresponding requests are unauthenticated.

For example, if I paste this endpoint in the browser #/external/ZW9zaG9tZS1nOjk0NTQ1MTM2/CodiMD, no redirection to keycloak happens and the request to the capabilities endpoint fails with 401.

[wkloucek]

Sounds like #6045

[ishank011]

The issue is probably this https://github.com/owncloud/web/blob/master/packages/web-app-external/src/index.js#L24

[labkode]

Linked to #6151