An example file that contains extra settings for Wordpress wp-config.php (this file has moved to https://github.com/Frojd/Manual)

wp-config-custom-settings.php

<?php

// Recognize protocol from load balancer/varnish
if (isset($_SERVER["HTTP_X_FORWARDED_PROTO"]) &&  $_SERVER["HTTP_X_FORWARDED_PROTO"] == "https") {
    $_SERVER["HTTPS"] = "on";
}

// Forward ip from load balancer/varnish
if (isset($_SERVER["HTTP_X_FORWARDED_FOR"])) {
    $_SERVER["REMOTE_ADDR"] = $_SERVER["HTTP_X_FORWARDED_FOR"];
}

// Use custom theme as default
define("WP_DEFAULT_THEME", "yourtheme");

// Disable the Plugin and Theme Editor 
// Set to false on dev environment
define("DISALLOW_FILE_EDIT", true);

// Disable Plugin and Theme Update and Installation 
// Set to false on dev environment
define("DISALLOW_FILE_MODS", true);