Currently, to prepopulate preemptive authentication for target and proxy, BasicScheme is created and processChallenge() is called. Then it is added to the AuthCache. This causes two issues:
1. The reference documentation never shows to do so.
2. With the Jetty 8 upgrade of all tests several unit tests failed because the scheme was set to completed=true initially and never reacted on requested preemptive auth or simply obstained from responding to 401 with proper credentials altogether.
This issue has been found during