mjhjmtu

I was developing a PWA(Progressive Web Application) on my Ubuntu 16.4 Offline and one requirement of the framework is an HTTPS connection to be able to run.

I configured my Apache server and enabled the HTTPS VirtualHost configuration. But the problem with the configuration is that I can't access it via HTTPS, only HTTP can access the local site. Apparently, the site works well on the development machine on both protocols.

I have actually had the same problem. I'll be interested to see a solution. I used a workaround and sacrificed encryption when accessed locally. Everything works fine from outside the network though. I edited /etc/hosts to map directly to local ip rather than having the DNS request happen remotely to send me back to my network.
Example

127.0.1.1 hostname
127.0.0.1 localhost
Local.app.ip www.example.com

This doesn't fix anything it's just convenient since otherwise it defaults to https and then won't load.

One of the machines I had this problem on was a laptop which posed a problem if I changed the hosts file and then was outside my local network. It would still try to connect to a local ip. I solved this with a bash script I found online that changes the file based on if a certain wifi network is available. Just for fun here is the script.

 
wifi=`iwlist wlp3s0 scan | grep SSID`
if [[ $wifi == *Home-Network* ]]
then
 #Use special host file
 cp -f /home/Documents/hosts.home /etc/hosts
else
 #Use normal host file
 cp -f /home/Documents/hosts.away /etc/hosts
fi

EDIT#200
It's stored in /etc/NetworkManager/dispatcher.d so it runs at startup.