ERR_CONNECTION_CLOSED when a direct download url via QR Code

Why the direct download url via a QR code won't work?

Hi I want to create a QR code for photos when user scan it they are able to see and download the image to their phone. However if I scan the below QR Code with my iPhone,

https://api.qrserver.com/v1/create-qr-code/?format=jpg&size=350x350&data=https://dl.dropboxusercontent.com/s/lrz52onl2z3u8zo/857962_10152607921160191_288815580_o_10152607921160191.jpg?dl=0

 

The Chrome returns 

This site can’t be reached

dl.dropboxusercontent.com unexpectedly closed the connection.
Try:
Checking the connection

ERR_CONNECTION_CLOSED. 

 

But if I copy and paste the URL, and it works without problem.

https://dl.dropboxusercontent.com/s/lrz52onl2z3u8zo/857962_10152607921160191_288815580_o_10152607921160191.jpg?dl=0

Any idea why that happens? 

 

Thanks