Mechanize 2.4 — HTTP Authentication security fix:
Mechanize#auth and Mechanize#basic_auth allowed disclosure of passwords to malicious servers and have been deprecated. In prior versions of mechanize only one set of HTTP authentication credentials were allowed for all connections. If a mechanize instance connected to more than one server then a malicious server detecting mechanize could ask for HTTP Basic authentication. This would expose the username and password intended only for one server. Mechanize#auth and Mechanize#basic_auth now warn when used. To fix the warning switch to Mechanize#add_auth which requires the URI the credentials are intended for, the username and the password. Optionally an HTTP authentication realm or NTLM domain may be provided.