At present time, any redirection from http to http or from https to https is supported by jenkins core. However, a redirection from an http-based URL to an https-based one (or vise versa) is not possible. Although the instanceFollowRedirects flag is set to true, if the performed redirection implies a change of protocol (from https to http or vise versa) the received response code will be 302 (more details here).