Downloading a https file in play framework works in development but not in production

I'm trying to download a dropbox link to a file output.txt. Something like this:

URL link = new URL("https://dl.dropboxusercontent.com/1/view/XXX/file.txt");
ReadableByteChannel rbc = Channels.newChannel(link.openStream());
FileOutputStream fos = new FileOutputStream("output.txt");
fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);

When I'm running my app in development (i.e. activator run) this works fine. When the app is staged and deployed in production, I get a connection timeout at the link.openStream() step:

play.api.UnexpectedException: Unexpected exception[ConnectException: Connection timed out]

I'm able to save any http files or websites to file in production. It just seems to time out on any https file. Any thoughts on how I could begin to tackle this?

Does this have anything to do with play or is it a configuration issue with my apache server?

Thanks

Copyright Notice：Content Author:「Omar Wagih」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/40901337/downloading-a-https-file-in-play-framework-works-in-development-but-not-in-produ