Failed to fetch events (404) from Google+ Calendars after OAuth 2.0 for limited devices

Question

I'm writing a watchapp for Pebble to show events from the Google calendars.

I'm using Auth 2.0 to authenticate the user as described in this document.

Then I retrieve events using this API v3 call, specifying my access_token in the authorization header.

For the calendars created and managed by the user everything works fine.

However if I try to get the events from the Google+ calendars, such as Birthdays (#[email protected]) or Holidays in Italy (en.italian#[email protected]), the answer is 404:

   {
        "error": {
            "errors": [
                {
                    "domain": "global",
                    "reason": "notFound",
                    "message": "Not Found"
                }
            ],
            "code": 404,
            "message": "Not Found"
        }
    }

What am I doing wrong? Or is it a bug of the Calendar API?

Answer 1

Thanks to luc, here's the answer!

I was calling the service this way:

var GET_EVENT_LIST = "https://www.googleapis.com/calendar/v3/calendars/%s/events";

var calendarId = "#[email protected]";
var token_type = "Bearer";
var access_token = "...";

var url = sprintf(GET_EVENT_LIST, calendarId);

var req = new XMLHttpRequest();
req.open("GET", url, true);
req.setRequestHeader("Authorization", token_type + " " + access_token);
req.send(null);

I solved changing the fifth line to:

var url = sprintf(GET_EVENT_LIST, encodeURIComponent(calendarId));