Comment 1 for bug 1848556

Oh, there's no problem checking the file once it's on the local filesystem:

$ wget http://10.193.37.117/cloud/bionic-server-cloudimg-amd64.img
--2019-10-17 17:51:33-- http://10.193.37.117/cloud/bionic-server-cloudimg-amd64.img
Connecting to 10.193.37.117:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 344195072 (328M)
Saving to: ‘bionic-server-cloudimg-amd64.img’

bionic-server-cloud 100%[===================>] 328.25M 105MB/s in 3.1s

2019-10-17 17:51:37 (105 MB/s) - ‘bionic-server-cloudimg-amd64.img’ saved [344195072/344195072]

$ qemu-img check bionic-server-cloudimg-amd64.img
No errors were found on the image.
16651/36032 = 46.21% allocated, 98.92% fragmented, 98.49% compressed clusters
Image end offset: 344195072