getting a 400 for twitter.com

[jimustafa]

Seems like twitter.com does not like the request for checking references. Not sure if this is a user agent issue, or just a problem on the twitter.com end.

A small snippet below used for testing:

import pdfx

print(pdfx.downloader.get_status_code('google.com'))
print(pdfx.downloader.get_status_code('twitter.com'))