Step 1
Login to arcgis online, find the http request with token,
click payload tab, copy the token
Step 2.
without token, you will see empty
https://services6.arcgis.com/cZHmCPiJM2xP0hYe/ArcGIS/rest/services
Step 3.
add ?token=xxxxx at the end of URL, you will see restricted content
https://services6.arcgis.com/cZHmCPiJM2xP0hYe/ArcGIS/rest/services?token=3NKHt6i2urmWtqOuugvr9aJI7rBAw-XuPivpMTTN8UA7WpBPEoQJ2giVzodJiPXNn0aNmfjY9g6LVpyxX_QAXVdYgF87zKcQbbbCBnJp-rQHneTbp3VGMNysUrYp48VXa9xEYNmpprRUSou9UYGUyx4sxiPOnDY1Ufwgv0bfPGb_xJ9REqybGl8D-Al6uQMHrp6qWUtp7bfdXSDKuKOy13AA_qVj5_b-vhbnkwvsvnLbUXxN_IA4psLfeG6tQDgH
1. Enterprise portal (arcgis server)
without token
1.2 Enterprise portal (arcgis server)
with token
2. arcgis online
2.1 arcgis online