You can enable authentication via a GET parameter, to allow automatic scripts to access the system without needing to go through the standard authentication.
Available parameters of authentication currently are:

• for username: user, username, login
• for password: pass, password, passwd, key

A request would then look like this: http://hudson.server.url/jobs/MyJob/?user=MyUser&pass=MyPass.

WARNING: When using this method the password will not be encrypted and can be sniffed of the network by anyone listening in.