Login does not work on HTTPS

[RibeyeOnTheBone]

We have had Pentaho running nicely from this image.

Recently installed nginx and https.

Now there is an issue with the login process. The user gets the failed login message. But if they then go directly to Pentaho it has them logged in. Also fails to return to the login screen if incorrect credentials are used.

My experts tell me the setup of nginx looks good. But function bounceToReturnLocation() is using http when it should be https?

nginx configuration
location /pentaho {
proxy_pass http://localhost:8181;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
}

login page
https://domain.com/pentaho/Login

function bounceToReturnLocation() {
    // pass
    var locale = document.login.locale.value;

    var returnLocation = 'http\x3A\x2F\x2Fdomain.com\x2Fpentaho\x2Findex.jsp';

    if (returnLocation != '' && returnLocation != null) {
      window.location.href = returnLocation;
    } else {
      window.location.href = window.location.href.replace("Login", "Home") + "?locale=" + locale;
    }

}

error
https://monosnap.com/file/ASomSwBmdC61GAVrsGhZAUTGEM4BEB