Google Contact API v3 : q parameter is ignored if search in a contact group

Question

I am working with Google Contact API v3. The goal is to synchronize contacts between my DB and a Google Account. My problem is :

1) when I search contact by email ad

Answer 1

I was also cracking my brains with this one. Seems that Google drops the q parameter when the group one is provided. To resolve this, I've started keeping the Google contact ID and queried it directly instead of via the Group. So basically you're stuck with fetching the contact directly, and then checking its group.
https://www.google.com/m8/feeds/contacts/default/full/{contact-id}