I updated the URL to be the ‘alternate’ type, which seems to match the pre-libgdata behaviour of the scope, which was to always request the first link in the entry as the file URL. After a bit of investigation, the first element seems to be of the ‘alternate’ type, corresponding to (from the Google API reference) a ‘Link at which a user could consume the same content given here, but in a web browser with a user interface.’ which seems to be what is desired here.
I updated the URL to be the ‘alternate’ type, which seems to match the pre-libgdata behaviour of the scope, which was to always request the first link in the entry as the file URL. After a bit of investigation, the first element seems to be of the ‘alternate’ type, corresponding to (from the Google API reference) a ‘Link at which a user could consume the same content given here, but in a web browser with a user interface.’ which seems to be what is desired here.