What currently works:
http://api.xxxxxx.com - switches to https and returns "Welcome to nginx!" page.
https://api.xxxxxx.com - returns "Welcome to nginx!" page
http://api.xxxxxx.com:3000/xxx/xxxxxxxxx/xx/xxx/xxx.xxx - returns the file byte array.

What doesn't:
https://api.xxxxxx.com:3000/xxx/xxxxxxxxx/xx/xxx/xxx.xxx - Error. "This site can’t provide a secure connection"

What I want to work:
https://api.xxxxxx.com/xxx/xxxxxxxxx/xx/xxx/xxx.xxx

var https = require('https');
httpServer.listen(443);
httpServer.on('error', onError);
httpServer.on('listening', onListening);