In case $_SERVER[‘REMOTE_ADDR’] returns 127.0.0.1

drop-in.php

<?php
/**
 * Example 2: Usage of 'ip-geo-block-ip-addr'
 * Use case: Retrieve ip address behind the proxy
 *
 * @param  string $ip original ip address
 * @return string $ip replaced ip address
 */
function my_retrieve_ip( $ip ) {
	if ( ! empty( $_SERVER['HTTP_X_FORWARDED_FOR'] ) ) {
		$tmp = explode( ',', $_SERVER['HTTP_X_FORWARDED_FOR'] );
		$tmp = trim( $tmp[0] );
		if ( filter_var( $tmp, FILTER_VALIDATE_IP ) ) {
			$ip = $tmp;
		}
	}

	return $ip;
}

add_filter( 'ip-geo-block-ip-addr', 'my_retrieve_ip' );

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