Coming across an error code while working upon a project is usually expected. But things take a turn when these error codes won’t go away or keep recurring. Something similar may happen while building a website with the help of the Codeigniter PHP framework. Yes, we’re talking about the CodeIgniter 404 error. Since you’ve landed here, I am sure this error is troubling you and this is the reason I have come up with this article to address this issue.
Here, we shall talk about the “404 Page Not Found” error at length, so that you can bid it goodbye whenever it shows up on your screen. Whether you are a beginner or an experienced developer, the occurrence of this error is quite frustrating. Isn’t it??? But, fret no more because this article has got you covered. However, before anything else, you must note that this error code doesn’t always mean that the file is missing. There could be other reasons as well. But, it is more than important to understand what this code actually is.
What is a CodeIgniter 404 error?
In layman’s terms, it refers to the “Lost Page” problem. To understand this better, you can take the example of a huge telephone switchboard, which we shall consider here as CodeIgniter. Whenever a user or visitor types a URL of a website, the main aim of the framework is to redirect you to the requested website or e.g. connect you to the correct department.
However, when this error occurs, it means that the URL is there, but the person you are trying to connect to is not listed in the switchboard’s directory. Therefore, one should not mistake it and consider the whole website to be down. It simply means that the CodeIgniter was not able to find the specific route you have requested. In short, CodeIgniter 404 error is something related to file-location or routing. Hence, do not consider it to be something related to server outage.
Why does CodeIgniter show a 404 error?
If you wish to find the main culprits behind the said error, you need to go through this article very carefully. Even small or common mistakes can lead to this error. Here are the common factors that might be responsible for it:
Missing Controller or Method
Sometimes a simple typo in the file names or class names can lead to CodeIgniter 404. Besides that, if your controller file is situated in an incorrect folder, then also the appearance of error can be expected. Besides that, you must ensure that if your file name is ‘Products.php”, then the name of the class must also be ‘Products’. The same is the case with ‘viewProduct’.
Routing Misconfigurations
If you see that there is nothing wrong with the file name or location, then the next reason behind the error could be the “map”. Since CodeIgniter uses a special file to help URLs locate the map, therefore any misconfiguration in the route could lead to this error. For example, if you haven’t specifically defined which URL will load which page, the CodeIgniter won’t know what to load and may show CodeIgniter 404.
Issues during URL rewriting
To make the URL look clean and pretty, developers use CodeIgniter to pass all the requests from a local server to an online server. The part from where your file passes during this phase is known as the ‘index.php’ file. Hence, if this file is misconfigured or goes missing or if it is not supported by your web host, the 404 error is sure to occur.
Trusted ways to fix the CodeIgniter 404 error
I hope you have finally diagnosed what might be happening with your page, URL or the CodeIgniter. After diagnosis, it is time now to fix the issue by following a step-by-step resolving technique:
Method 1- Check the Controller as well as the URL
Before any complex procedures, I would highly recommend you to cross-check the URL structure. Besides that, you must also check if the controller named “controller-name” is present in the “Controllers” folder. Moreover, you should also check whether there is a method named “method-name”. Even the mistakes related to uppercase and lowercase letters can give way to CodeIgniter. So, check it very carefully.
Method 2- Review your routes file
After checking the Controller and URL, you must check the routes file to fix CodeIgniter 404. If you are using the CI4 version which uses the “Auto Routing” feature, open the `app/Config/Routes.php` and make sure that this feature is enabled. Moreover, in case you are using “Defined Routes,” you must ensure that the left side of the URL as well as the right side of the (Controller::method) are accurate. If not, take necessary action to correct it.
Method 3- use Logs and Tools to debug
After rechecking the page, if you see that it is still not working, you need to check what CodeIgniter is actually up to and what it is thinking. In your `/app/Config/Logger.php` CI4, you must enable logging threshold to view the info level and to debug. At this stage, you must reproduce the error and then carefully review the “Logs” folder. If you see an entry for CodeIgniter 404- Page Not Found, then this means that it is trying to look for the right thing but there is an internal factor that is stopping or failing.
Besides that, you may also press F12 in your web browser and access the Developer Tools. Following this, you must navigate to the “Network” tab and refresh the page. This will help you find more information about the requested URL and response generated by the server.
Conclusion:
When there is a communication breakdown between the URL and the website, the CodeIgniter 404 may show up. However, instead of getting worried about this, you should take necessary practical measures and try to find out about the culprit to get back to working on your website again. I hope this guide has given you deep insights on the same.
FAQs – Frequently Asked Questions
What does 404 mean in coding?
Well this error usually occurs when the webpage you are trying to access is not available on the server.
Why am I getting a 404 error even though my controller exists?
This could happen when the name of the Controller does not match with the URL. Besides that, if the Method name is incorrect or the route has not been defined properly, then you’ll certainly get this error.
How do I manually show a 404 error in CodeIgniter?
To do so in CodeIgniter 4, you can throw this code \CodeIgniter\Exceptions\PageNotFoundException::forPageNotFound();
Why does CodeIgniter show 404 after removing index.php from the URL?
This usually happens in CodeIgniter when .htaccess rewrite rules are not configured in the correct manner.
