Thanks OriginalEXE , placehold.it not works for me (Your IP address based on the country, region or network has been flagged by the website owner )
I just found this article by jeffry way
top 8 placeholders , only PlaceKitten and Placedog works for me
PlaceKitten is unbelievable fast (just like opening the local images)
Placedog is unbelievable slow
LoremPixum is quite unstable :
Service Temporarily Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.
Additionally, a 503 Service Temporarily Unavailable error was encountered while trying to use an ErrorDocument to handle the request.
others are just can't be opened