class HTTPClient::ProxyDigestAuth

Ignores uri argument. Used in ProxyAuth.
Authentication filter for handling DigestAuth negotiation.

def challenge(uri, param_str) 

def challenge(uri, param_str)
  synchronize {
    @challenge = parse_challenge_param(param_str)
    true
  }
end

def get(req)

before
regardless of target uri if the proxy has required authentication
overrides DigestAuth#get. Uses default user name and password 
def get(req)
  synchronize {
    param = @challenge
    return nil unless param
    user, passwd = @auth
    return nil unless user
    calc_cred(req, user, passwd, param)
  }
end

def reset_challenge 

def reset_challenge
  synchronize do
    @challenge = nil
  end
end

def set(uri, user, passwd)

overrides DigestAuth#set. sets default user name and password. uri is not used. 
def set(uri, user, passwd)
  synchronize do
    @auth = [user, passwd]
  end
end