Note on User IDs
There are some system tags and other similar places where user ID is present. Examples:
user/1005921515/label/Testing
user/1005921515/state/com.google/root
user/1005921515/state/com.google/read
When you need to pass those back to the API, you can safely replace the user ID with -
. This way you don't have to worry about parametrizing your request parameters.
For example user/1005921515/label/Testing
becomes user/-/label/Testing
.