Revert "Merge pull request #311 from sonatype/401-error-page" due to build failures (cause: error page cannot be webresource, as it accepts only GETs).

This reverts commit 75f0a0e0b9db99953a4aa3ec3c03a6750fa24e21, reversing
changes made to 7cbf810e804fa9a88c84b324275f9487fbd2f10a.