why does twitter have two hidden fields named 'authenticity_token' while posting the login form? I just don't get how do you send to hidden fields of the same name?
If you want to fill those fields when the form is POSTED. Add your hidden variable - For example:
google.com/hello.php?id=lilwayne&password=3838&authenticity_token=whateveruwantou
or if this helps you better understand:
google.com/submit.php?authenticity_token=hheheheheh
Hope this helps