[Regression][2.3] HTTP redirections are not being followed properly

[SamuAlfageme]

Expected behavior

On multi-tenancy installations (like the one in https://github.com/owncloud/administration/tree/master/redirectServer) after getting the username, the final destination host should be reached following the redirections:

OCC::PropfindJob::finished: PROPFIND request *not* successful, http result code is 301 ""
OCC::OwncloudSetupWizard::slotAuthError: authed request was redirected to "https://owncloud.achernar.uberspace.de/instance1/remote.php/webdav/"
OCC::OwncloudSetupWizard::slotAuthError: setting account url to "https://owncloud.achernar.uberspace.de/instance1"
OCC::AbstractNetworkJob::start: !!! OCC::PropfindJob created for "https://owncloud.achernar.uberspace.de/instance1" + "/" "OCC::OwncloudSetupWizard"
OCC::AbstractNetworkJob::start: !!! OCC::PropfindJob created for "https://owncloud.achernar.uberspace.de/instance1" + "/" "OCC::OwncloudAdvancedSetupPage"
OCC::OwncloudWizard::slotCurrentPageChanged: Current Wizard page changed to  3

Actual behavior

Instead of the 301 code, the PROPFIND is getting:

OCC::PropfindJob::finished: PROPFIND request *not* successful, http result code is 200 ""

Steps to reproduce

1. Server URL: https://owncloud.achernar.uberspace.de
2. User: test@instance1.com & Pass: secret
3. Try to connect.

[ckamm]

The problem is that followRedirects is true for the auth-test PROPFIND request. That circumvents the wizard's custom redirect handling. Also, the automatically followed redirect request uses GET, which is a second issue.

Initial tests suggest setting followRedirects to false makes this work.

[ckamm]

Pull request: #5554

[SamuAlfageme]

LGTM 👍