Flowdock: Administration - White-list Flowdock related url on external network

Document ID : KB000094241
Last Modified Date : 03/05/2018
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What is the list of backend URLs that are to be allowed for Flowdock to work?
If the customer is whitelisting by domain name then *.cloudfront.net, *.flowdock.com, and *.amazonaws.com are probably enough, but that may still mean broken image links inside of flows, if people post links in flows.