CodeIgniter Always tip 404

My system is ubuntu-14.04 + nginx-1.4.6 + PHP-5.5.9
The default controller for the Default_controller settings set in application/config/routes.php can be opened normally. But when you enter your own defined controller in the browser, Tip 404, Why?

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My system is ubuntu-14.04 + nginx-1.4.6 + PHP-5.5.9
The default controller for the Default_controller settings set in application/config/routes.php can be opened normally. But when you enter your own defined controller in the browser, Tip 404, Why?

Maybe the rewrite was wrong.
It's probably the wrong route configuration.
Maybe the URL was wrong.
In general, the index.php is not short of

It's best to affix the Nginx rewrite rules, route rules, and URLs, or even the code in the controller

This is usually because you do not find the reason for your custom controller, check the controller name and file name, and the corresponding class name is consistent.

You can post the URL. Look at the ...

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