Here are some common installation problems, and suggested workarounds.

How do I know if my install is working?

From the command line, at your project root:

php spark serve

http://localhost:8080 in your browser should then show the default welcome page:

CodeIgniter4 Welcome

I have to include index.php in my URL

If a URL like /mypage/find/apple doesn’t work, but the similar URL /index.php/mypage/find/apple does, that sounds like your .htaccess rules (for Apache) are not setup properly, or the mod_rewrite extension in Apache’s httpd.conf is commented out.

Only the default page loads

If you find that no matter what you put in your URL only your default page is loading, it might be that your server does not support the REQUEST_URI variable needed to serve search-engine friendly URLs. As a first step, open your app/Config/App.php file and look for the URI Protocol information. It will recommend that you try a couple of alternate settings. If it still doesn’t work after you’ve tried this you’ll need to force CodeIgniter to add a question mark to your URLs. To do this open your app/Config/App.php file and change this:

public $indexPage = 'index.php';

To this:

public $indexPage = 'index.php?';

The tutorial gives 404 errors everywhere :(

You can’t follow the tutorial using PHP’s built-in web server. It doesn’t process the .htaccess file needed to route requests properly.

The solution: use Apache to serve your site, or else the built-in CodeIgniter equivalent, php spark serve from your project root.