fail2ban/fail2ban — pull request #676 by yungchin (2014-04-02 11:34:27+00:00)
Title: nginx-http-auth filter: match server_name = ""

As documented at http://nginx.org/en/docs/http/server_names.html#miscellaneous_names "If no server_name is defined in a server block then nginx uses the empty name as the server name." This regex change allows us to match error output for such a configuration.