Codeigniter echoing [::1] instead of localhost - php

Question

I am using CodeIgniter 3 as a web platform and trying to import semantic-UI CSS into my page. I'm doing so by using CodeIgniter's base_url() method in the href property for the CSS import.
However, semantic.css itself imports some other fonts on my server, which cannot load because of Cross-Origin resource sharing policy. This is the error message chrome gives me:
Font from origin 'http://[::1]' has been blocked from loading by Cross-Origin Resource Sharing policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost' is therefore not allowed access.
This is because base_url() echoes the domain has been [::1] and not localhost as I've typed into the browser.
For some reason, it appears to me that chrome (and also Edge) does not consider [::1] and localhost as the same host, or maybe I'm just being dumb. What I know though is that if I change the path of the main semantic.css file and complex code localhost into it, it works, and it also works if, instead of requesting my page using localhost, I use [::1]
I've done other projects very similar to this and never had this "[::1]" appear. What exactly is causing PHP to echo such a path?

Answer 1

It's because of your base_url is empty.
In config/config.php
$config['base_url'] = 'http://localhost/project_name';
Something more interesting about http://\[::1\]/

Answer 2

You need to edit your $config['base_url'] as follows,
$config['base_url'] = '';
$config['base_url'] = ((isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == "on") ? "https" : "http");
$config['base_url'] .= "://" . $_SERVER['HTTP_HOST'];
$config['base_url'] .= str_replace(basename($_SERVER['SCRIPT_NAME']), "", $_SERVER['SCRIPT_NAME']);
File location: codeigniter/application/config/config.php
Use above code to get dynamic url.

Answer 3

More accurate and dynamic way
$root = "http://".$_SERVER['HTTP_HOST'];
$root .= dirname($_SERVER['SCRIPT_NAME']);
$config['base_url'] = $root;
Though you can still use port.

Answer 4

In order to use base_url(); you must first have the URL Helper loaded. This can be done either in application/config/autoload.php (on or around line 67): or you can manually using
$this->load->helper('url');
than set the
$config['base_url'] = 'http://localhost/your_site_url';
i think it will help you

Answer 5

This is what you need to alter in config/config.php, it works properly in "localhost" as well as in your "server":
$config['base_url'] = "http://".$_SERVER['SERVER_NAME'];
$config['base_url'] .= str_replace(basename($_SERVER['SCRIPT_NAME']),"",$_SERVER['SCRIPT_NAME']);
if(!defined('DOCUMENT_ROOT')) define('DOCUMENT_ROOT',str_replace('application/config','',substr(__FILE__, 0, strrpos(__FILE__, '/'))));
$config['base_path'] = constant("DOCUMENT_ROOT");
$config['js_url'] = $config['base_url'].'js/';
$config['css_url'] = $config['base_url'].'css/';
$config['image_url'] = $config['base_url'].'img/';
// Host resolution for cross origin requests
if(ENVIRONMENT == 'production') {
$config['host'] = 'www.<domain_name>.com';
} else {
$config['host'] = 'localhost';
}