Ubuntu下XAMPP运行CodeIgniter出现404错误求助

Hey JuanF, let's figure out why your existing CodeIgniter app is throwing 404 errors on Ubuntu + XAMPP while new projects work fine. Since fresh setups run without issues, the problem is tied to your app's specific configuration or file setup. Here are step-by-step checks and fixes:

1. Verify CodeIgniter Core Configuration #

First, check your app's core config file at application/config/config.php:

• Ensure $config['base_url'] is set correctly to your project's root URL, e.g.:

  $config['base_url'] = 'http://localhost/your-project-folder/';
  

  Leaving this empty or using an incorrect path can break routing entirely.
• Set $config['index_page'] to an empty string to let .htaccess handle removing index.php:

  $config['index_page'] = '';
  

• Adjust $config['uri_protocol'] if needed—Ubuntu's XAMPP sometimes requires REQUEST_URI instead of the default:

  $config['uri_protocol'] = 'REQUEST_URI';
  

2. Check .htaccess Placement, Permissions, and mod_rewrite #

• Location: Make sure your .htaccess file is in your project's root directory (same folder as index.php), not inside the application folder.
• Permissions: On Ubuntu, file permissions might block Apache from reading the .htaccess. Run this command (replace with your actual project path):

  sudo chmod 644 /opt/lampp/htdocs/your-project/.htaccess
  

• Enable mod_rewrite: Even if new projects work, double-check that mod_rewrite is enabled in XAMPP's Apache config. Open /opt/lampp/etc/httpd.conf, find and uncomment this line:

  #LoadModule rewrite_module modules/mod_rewrite.so
  

  Remove the # at the start, then restart Apache via the XAMPP control panel.

3. Update Apache's AllowOverride Setting #

Apache might be ignoring your .htaccess rules if AllowOverride is set to None. Open /opt/lampp/etc/httpd.conf, locate the directory block for your web root (e.g., <Directory "/opt/lampp/htdocs">), and change:

AllowOverride None

to:

AllowOverride All

Restart Apache after making this change to apply the setting.

4. Check Routing and File Case Sensitivity #

Ubuntu is case-sensitive, which is a common pitfall for CodeIgniter apps developed on Windows (which is case-insensitive):

• Open application/config/routes.php and confirm the default controller is set correctly, with matching case to the controller file. For example, if your controller is Home.php, the route should be:

  $route['default_controller'] = 'Home';
  

• Verify that all controller and method names match their file names exactly (e.g., UserController.php can't be referenced as usercontroller in URLs or routes).
• Check for custom routes that might be conflicting with your intended URLs.

5. Test Direct Index.php Access #

To isolate whether the issue is with .htaccess or CodeIgniter routing, try accessing your app directly with index.php in the URL:

http://localhost/your-project/index.php/your-controller/your-method

• If this works, the problem is with .htaccess not being applied—go back to checking Apache's AllowOverride and mod_rewrite settings.
• If this still throws a 404, the issue is with your controller/method existence, naming, or routing rules.

内容的提问来源于stack exchange，提问作者JuanF