Such an error can occur in a few scenarios: Diagnosing a 404 Not Found ErrorĪs mentioned, a 404 Not Found Error indicates that the client (web browser) is receiving a message from the server (remote computer) that the specific resource (web page/URL) is unavailable. This will give you a clean testing ground with which to test all potential fixes to resolve the issue, without threatening the security or sanctity of your live application. Even better, if you have the capability, create a complete copy of the application onto a secondary staging server that isn’t “live,” or isn’t otherwise active and available to the public. As such, it is critical that you perform a full backup of your application, database, and so forth, before attempting any fixes or changes to the system. Start With a Thorough Application BackupĪs with anything, it’s better to have played it safe at the start than to screw something up and come to regret it later on down the road. In these scenarios, the server is still the network object that is producing the 404 Not Found Error, and returning it as the HTTP response code to the client, but it could be that the client is causing the issue in some way. We’ll explore some of these scenarios (and potential solutions) down below, but be aware that, even though the 404 Not Found Error is considered a client error response, it doesn’t inherently mean we can rule out either the client nor the server as the root of the problem. You may be trying to access an invalid URL, the browser could be sending invalid credentials to the application, and so on. That said, since a 404 Not Found Error indicates that the resource that’s trying to be accessed is unavailable, it’s entirely possible the issue steps from the client. Many smart phone apps that have a modern looking user interface are actually powered by a normal web application behind the scenes one that is simply hidden from the user. This doesn’t apply solely to web sites, either. Oftentimes, if you’re trying to diagnose an issue with your own application, you can immediately ignore most client-side code and components, such as HTML, cascading style sheets (CSS), client-side JavaScript, and so forth. That said, the appearance of a 4xx error doesn’t necessarily mean the issue is something to do with the client, where the client is the web browser or device being used to access the application. These types of messages contrast with errors in the 5xx category, such as the 502 Bad Gateway Error we looked at last week, which are considered server error responses. We’ll also look at a handful of the most common content management systems ( CMSs) that are in use today, giving you some insight into potential problem areas within these systems that might cause an unexpected 404 Not Found Error, so let’s get started! Server- or Client-Side?Īll HTTP response status codes that are in the 4xx category are considered client error responses. In this article we’ll explore the 404 Not Found Error by examining what might cause this error, while providing a few tips and tricks to help you diagnose and debug your own application that is experiencing such issues. There are well over 50 potential status codes that represent the complex relationship between the client, a web application, a web server, and often multiple third-party web services, so determining the cause of a particular status code can be a challenge under the best of circumstances. Like most HTTP response codes, and particularly for those codes that indicate an error, the cause of a 404 Not Found Error can be difficult to track down and resolve. The 404 Not Found Error is an HTTP response status code, which indicates that the requested resource could not be found.
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