Hi...

I have an issue to get the parameters are coming from Google OAuth request.

This is my code:

<apex:page controller="GoogleDriveController" showQuickActionVfHeader="true" action="{!init}" >

...
</apex:page>

public void init(){

        System.debug('GoogleDriveController CONSTRUCTOR');
        System.debug('THECODE '+ApexPages.currentPage().getParameters().get('code'));

        for(String val : ApexPage.currentPage().getHeaders().keySet()){

            System.debug('head '+val+' -- '+ApexPages.currentPage().getParameters().get(val));
        }

        for(String val : ApexPages.currentPage().getParameters().keySet() ){

            System.debug('val '+val+' -- '+ApexPages.currentPage().getParameters().get(val));
        }

        code = ApexPages.currentPage().getParameters().get('code') ;
        //Get the access token once we have code
        if(code != '' && code != null){

            AccessToken();
        }
    }

I can see in the browser inspect network the request with all parameters
 

https://myinstance.lightning.force.com/lightning/n/MyGoogleDrive?state=security_token%3D138r....

but the page is redirected and the parameters are removed.

The Debug Logs only shows the parameters ​​​​​​​from the servelet

my.salesforce.com/servlet/servlet.Integration?lid=01r63000000NUnV&ic=1&tour=&isdtp=p1&sfdcIFrameOrigin=https://speed-dream-189-dev-ed.lightning.force.com&sfdcIFrameHost=web&nonce=a9592094acf18f348a08b1e994e9addec1051e483efa3184630d1f17ebd71d89&ltn_app_id=06m63000000CUlNAAW&clc=0

The google sites: https://accounts.google.com, 
https://www.googleapis.com are included in the Remote Site setting.

Thanks