We use Picasa Google API with OAuth 2.0. Session token expires after one hour. During this hour we retrieve a user photo and get its content URL from the media:group (this is the URL of the image itself).
We see that this URL still works though session has expired. Does this URL ever expire?
The URL looks like: https://lh3.googleusercontent.com/-iXvyLB_PnyA/UdAiPE-W7qI/AAAAAAAOo0/nNnqspBaxGc/s3000/IMG_1.JPG
