If a file to import from a URL doesn't have a file extension, Feeds fails to import it.
https://s4.reutersmedia.net/resources/r/?m=02&d=20160330&t=2&i=1128905435
1) failed to validate with the following errors:
field_photo.0: Only files with the following extensions are allowed: png gif jpg jpeg.
2) failed to save because the extension AAuE7mC3_09BzkSYxsRtNA=c0x00000000-cc-rp-mo-ba5 is invalid
https://lh3.googleusercontent.com/a-/AAuE7mC3_09BzkSYxsRtNA=c0x00000000-cc-rp-mo-ba5.jpg
title,file
Lorem Ipsum,https://s4.reutersmedia.net/resources/r/?m=02&d=20160330&t=2&i=1128905435
If an extension isn't specified in the url, try to determine the extension by inspecting the mime type of the file.
Needs work
3.0
Code
The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Had to import XLSX files that similarly did not have a filename in the path. Used content-disposition / content-type headers. If someone finds this useful, this worked for me, up to now.