Download an Android apk file from your site

This will probably never happen to you but, if you're in a similar situation as me, which is:

• you've got a website
• the website uses HTTPS and a self-signed certificate
• you try to download an APK file from that website directly onto your phone
  

Then you'll notice that the download starts but never completes, you'll get a perpetual "Waiting for data connection..." message. Took me a while to find out, but this is a known issue.