I've install Odoo 10 behind the apache proxy with this configuration

<VirtualHost *:81>
 ServerName localhost
    ServerAlias localhost
 ServerAdmin localhost
 
    LogLevel debug
    ErrorLog "logs/geodatamanagement.error.log"
    CustomLog "logs/geodatamanagement.access.log" combined
    
 Redirect / https://localhost
</VirtualHost>
<VirtualHost *:443>
    ServerName localhost
    ServerAlias localhost
 ServerAdmin localhost
    LogLevel warn
    ErrorLog "logs/geodatamanagement.https.error.log"
    CustomLog "logs/geodatamanagement.https.access.log" combined
    SSLEngine on
    SSLProxyEngine on
    SSLCertificateFile "conf/ssl.crt/server.crt"
    SSLCertificateKeyFile "conf/ssl.key/server.key"
     ProxyPreserveHost on
     ProxyPass / http://localhost:8069/ retry=0
     ProxyPassReverse / http://localhost:8069/
</VirtualHost>

My public ip is 189.XXX.XX.XXX

I have access from https://189.XXX.XX.XXX but the code autogenerated to integrate the livechat using the javascript 

<link rel="stylesheet" href="http://189.XXX.XX.XXX:81/im_livechat/external_lib.css"/>
<script type="text/javascript" src="http://189.XXX.XX.XXX:81/im_livechat/external_lib.js"></script>
<script type="text/javascript" src="http://189.XXX.XX.XXX:81/im_livechat/loader/8"></script>

Also if change on https://189.XXX.XX.XXX/im_livechat/loader/8 the code remains

document.addEventListener("DOMContentLoaded", function(event) {

 odoo.define('web.session', function (require) {

  var Session = require('web.Session');

  var modules = odoo._modules;

  return new Session(undefined, "http://188.xxx.xxx.xxx:81", {modules:modules, use_cors: false});

 });

 odoo.define('im_livechat.livesupport', function (require) {

 });

});

Any suggest ?