Error code 403 in Google+ api

Question

I got \"error\": { \"errors\": [ { \"domain\": \"usageLimits\", \"reason\": \"dailyLimitExceededUnreg\", \"message\": \"Daily Limit for Unauthenticate

Answer 1

I got the same error and after much hunting I found that, in my case, the Authorization header with the access token was not set. Set Authorization: "Bearer " in the header of the request of EVERY Google API call.