UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36

Example URL:
https://durhamcollege.desire2learn.com/d2l/le/content/216795/viewContent/2572499/View

Steps to reproduce the problem:
Open the link sign in to the account and it will downloiad the pdf rather than opening it

What is the expected behavior?
PDF.js v1.4.20 (build: b15f335)
Message: Unexpected server response (0) while retrieving PDF "https://s3.ca-central-1.amazonaws.com/d2l-docbuilder-prod-ca-central-1-converted/5b023374-e0bc-40bb-ae19-f5505d295caa/c9547e8001823fceb9e7db56e6070a5a.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAJQZL7HDIX4EJHSCA%2f20180322%2fca-central-1%2fs3%2faws4_request&X-Amz-Date=20180322T212228Z&X-Amz-Expires=900&X-Amz-Signature=f45d13728cd405e65a49318e8a9493b9fdfe2fd0626cb7c13f1ec609764a75af&X-Amz-SignedHeaders=host".

What went wrong?
PDF.js v1.4.20 (build: b15f335)
Message: Unexpected server response (0) while retrieving PDF "https://s3.ca-central-1.amazonaws.com/d2l-docbuilder-prod-ca-central-1-converted/5b023374-e0bc-40bb-ae19-f5505d295caa/c9547e8001823fceb9e7db56e6070a5a.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAJQZL7HDIX4EJHSCA%2f20180322%2fca-central-1%2fs3%2faws4_request&X-Amz-Date=20180322T212228Z&X-Amz-Expires=900&X-Amz-Signature=f45d13728cd405e65a49318e8a9493b9fdfe2fd0626cb7c13f1ec609764a75af&X-Amz-SignedHeaders=host".

Does it occur on multiple sites: N/A

Is it a problem with a plugin? No 

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 64.0.3282.186  Channel: n/a
OS Version: 10.0
Flash Version: