"Could not recognize auth header undefined" messages

[akralj]

hi,
thank you for this great library. I'm getting lots of these messages:
[info] [<0.149.0>] 10.192.2.17 - - GET /_utils/_sidebar.html 200
[info] [<0.149.0>] Could not recognize auth header undefined
[info] [<0.144.0>] Could not recognize auth header undefined
[info] [<0.144.0>] 10.192.2.17 - - GET /_utils/image/spinner_33.gif 200
[info] [<0.149.0>] 10.192.2.17 - - GET /_all_dbs 200
[info] [<0.144.0>] Could not recognize auth header undefined
[info] [<0.144.0>] 10.192.2.17 - - GET /_utils/image/logo.png 200
[info] [<0.144.0>] Could not recognize auth header undefined
[info] [<0.144.0>] 10.192.2.17 - - GET /_utils/image/sidebar-toggle.png 200
[info] [<0.146.0>] Could not recognize auth header undefined
[info] [<0.146.0>] 10.192.2.17 - - GET /_session 200
[info] [<0.144.0>] Could not recognize auth header undefined
[info] [<0.144.0>] 10.192.2.17 - - GET / 200
[info] [<0.149.0>] Could not recognize auth header undefined
[info] [<0.145.0>] Could not recognize auth header undefined
Is this by design or is my config wrong? ldap authentication works like a charm otherwise.
thanks
andrej