Google Contacts API v3 does not return system groups

Question

I found that Google Contacts API v3 does not return system groups when I fetch feed of all contacts:

https://www.google.com/m8/feeds/contacts/default/full

But if I supply v2 via GET param:

https://www.google.com/m8/feeds/contacts/default/full?v=2

all system groups are returned for contact entries.

Same thing when i try to fetch list of groups:

https://www.google.com/m8/feeds/groups/default/full

Is there another way to receive system groups? Or v3 just does not support receiving system groups anymore?

Answer 1

Contacts API v3 is denoted by ?v=3. When you do not specify a version parameter you are actually using the v1 API.