digest.auth_header throws: NoMethodError (undefined method `gsub' for nil:NilClass)

[rgaufman]

This is an response['WWW-Authenticate'] from a Hikvision IP camera, when I try to generate an auth-header I get this:

> uri
=> #<URI::HTTP http://admin:password1@192.168.1.163/ISAPI/Event/notification/alertstream>
> WWWAuthenticate
=> ["Digest qop=\"auth\", realm=\"IP Camera(C2198)\", nonce=\"4e474d325a6a55335a474d364d57566d596a4a6b4d446b3d\", stale=\"FALSE\"", "Basic realm=\"IP Camera(C2198)\""]
> digest.auth_header(uri, WWWAuthenticate, 'GET')
Traceback (most recent call last):
        1: from (irb):37
NoMethodError (undefined method `gsub' for nil:NilClass)

Any ideas?

[blakeage]

I had the same problem and realized the server I was attempting to authenticate had authentication turned off. After turning it back on, the error went away.