What Causes Error404 and How to Prevent It

Error 404 is a common issue that can be frustrating to deal with. It's caused by a website or webpage being inaccessible, resulting in a "page not found" message.

This error occurs when a user tries to access a webpage or website that no longer exists or has been moved to a different location. This can happen due to various reasons, such as website redesign, server issues, or incorrect URL entry.

One of the main reasons for Error 404 is a mismatch between the URL entered by the user and the actual URL of the webpage. This can be caused by typos, incorrect links, or outdated bookmarks.

To prevent Error 404, it's essential to ensure that all URLs are accurate and up-to-date.

A 404 error occurs when your browser can't find the content you're looking for, usually because of a broken link or a typo in the URL.

This error can happen when you click on a link that doesn't exist or type a URL incorrectly. It's like trying to find a specific book in a library, but the book is nowhere to be found.

If a website is undergoing updates or restructuring, pages may be removed without proper redirects, leading to a 404 error. This can be frustrating for visitors who are trying to access specific content.

Here are some examples of how a 404 error can look:

Error 404 can be frustrating, but understanding what it means can help you troubleshoot the issue. A client-side error with the code 404 indicates that the browser can't locate the requested content.

This error typically appears when a visitor clicks on a broken link or types a URL improperly. This can happen if you've accidentally mistyped the URL, or if the link is outdated.

Pages can also become inaccessible during website updates, platform changes, or when the site structure is altered without proper redirects. This can cause confusion for users who are trying to access the content.

Soft errors are a sneaky thing. They can occur when a website returns a standard web page with a "200 OK" response code, making it seem like the page loaded properly, but actually, it's a "not found" error - this is known as a soft 404.

Soft 404s can be tricky to spot, especially for automated methods of discovering broken links. Some search engines, like Yahoo and Google, use automated processes to detect soft 404s.

Soft 404s can happen due to configuration errors with certain HTTP server software, like Apache. For example, if an Error Document 404 is specified as an absolute path, rather than a relative path.

This can also be done on purpose to force some browsers to display a customized 404 error message. In Internet Explorer, this behavior is triggered when a 404 is served and the received HTML is shorter than a certain length.

Soft errors aren't limited to 404s, though. There are also "soft 3XX" errors where content is returned with a status 200 but comes from a redirected page, like when missing pages are redirected to the domain root/home page.

HTTP 404 errors are often caused by broken links, which can happen when a link points to a page that's been moved or doesn't exist anymore. This is like being given directions to a party only to find out the party has moved to a different spot.

Typo mistakes in the URL can also lead to 404 errors, and this can happen to anyone, even experienced web users. An incorrect request might result from someone mistyping or forgetting the URL of a specific website.

Server issues can also cause 404 errors, often due to misconfiguration or maintenance. A quick chat with your web host or a review of your server settings can usually fix the problem.

Here are some common causes of 404 errors:

Frequent occurrences of 404 errors can lead to pages being deindexed by Google crawlers, reducing visibility and organic traffic.

Broken links are a common cause of 404 errors. They can occur when a link points to a page that's been moved or doesn't exist anymore.

Typo mistakes are another factor that can result in Error 404 Not Found messages. An incorrect request might result from someone mistyping or forgetting the URL of a specific website.

Outdated bookmarks can also cause 404 errors. Users sometimes bookmark webpages for future reference, but they might forget to update those bookmarks after moving or renaming the page.

Incorrect redirects can send users to the wrong location, causing a 404 error. Webmasters frequently use server-side redirects to manage changes in the website architecture, including moving or renaming pages.

Here are some common causes of 404 errors:

It's surprising how often a simple typo can lead to a 404 error. For example, if someone types a URL with a missing slash, their browser will end up at a 404 error page instead of the page they wanted.

Server issues can be a sneaky cause behind those 404 errors you might encounter on a website.

It's like having a glitch in the heart of your website's operations, making it difficult for users to access the webpage they're trying to reach. This can happen due to a server being down for maintenance or a misconfiguration in the server settings.

In some cases, server issues can occur if you've recently moved your website to a new hosting provider or made changes to the DNS settings, which is like updating the address book for the internet, but sometimes the information doesn’t get updated correctly.

Server issues can lead to 404 errors, but the good news is that these are usually fixable. A quick chat with your web host or a review of your server settings can often set things straight.

Here are some common server-related issues that can cause 404 errors:

These issues can be easily resolved with some technical assistance, ensuring that your website's engine runs smoothly and users can access the content they're looking for.

Customizing error pages is a great way to improve the user experience on your website. You can configure your web server to display a custom 404 error page, including a more natural description, the parent site's branding, and sometimes a site map or search form.

Internet Explorer, however, has a quirk where it won't display custom pages unless they are larger than 512 bytes, opting instead to display a "friendly" error page. Google Chrome also has a similar functionality where the 404 is replaced with alternative suggestions generated by Google algorithms if the page is under 512 bytes in size.

Many organizations use 404 error pages to inject humor into what may otherwise be a serious website. For example, Metro UK shows a polar bear on a skateboard, and the web development agency Left Logic has a simple drawing program.

To create a custom 404 error page, you can use special CMS extensions. If your CMS doesn't give you the option of creating or changing your 404 page, or if your website is solely based on HTML, PHP, etc., it will prove a bit more complicated. You can create an error page as follows:

Having a standard 404 error page is better than having none at all, although a customized page is more preferred for several reasons. You can provide a specially-designed error page containing related links, a search function, or a witty joke on the situation.

Some organizations customize their 404 pages with site maps or search boxes that are designed to help the user navigate to a helpful page. For example, the Amazon 404 page has a photo of a dog, or dogs, with the added text "Sorry we couldn't find that page. Try searching or go to Amazon's home page."

You can create a custom page that explains the issue by leaving useful information or a joke instead of leaving users empty-handed. Consider creating a custom landing page for this scenario that includes useful resources, relevant products/services, or a witty joke on the situation so that users continue interacting with the business.

Here are some effective ways to resolve the 404 error code:

You can fix 404 errors on your own site using a website analysis tool such as Google Search Console or Screaming Frog SEO Spider to identify links that result in 404 errors.

If the URL for a page has changed, the old URL should be retained as a redirect file. This is the easiest way to fix a 404 error.

To identify and fix 404 errors, you can also restore deleted webpages as long as there is no business reason to keep it deleted. If there is a reason to keep it deleted, then the link should be redirected.

A custom error response can be created and substituted for the 404 page that a browser usually provides. This can contain a message and encourage the user to send a note to the webmaster so that the situation can be fixed.

Double-check the URL for typos, as only one mistyped character can result in a 404 error. For example, check whether .htm should be .html or vice versa.

Refresh the webpage, as 404 errors might be a momentary glitch.

If the page still doesn't work, try searching the web to see if the page has moved to a different URL.

Use another device to see if the issue is with the user's browser. If the page works on another device, clear the first device's cache and cookies.

If all else fails, go to the Internet Archive's Wayback Machine to see what the specific URL looked like in the past.

Contact the website and send a note to the webmaster so that the link can be fixed.

Here are three free tools to help you find broken links more easily:

Monitoring 404 errors is crucial to maintaining a healthy website. You can use website analytics tools like Hotjar, Mixpanel, or Google Analytics to get real-time notifications when users encounter 404 errors.

These tools provide valuable information on the number of users affected, their source, and the impacted pages, helping you identify patterns and areas for improvement. Google Analytics, for instance, offers detailed reports on 404 errors, including suggestions on how to rectify them.

To take it a step further, consider installing plugins or extensions designed for monitoring 404 errors, such as the Broken Link Checker plugin for WordPress or the Googlebot Crawl Errors Chrome extension.

Regular audits and user feedback are also essential in staying on top of 404 errors. Performing manual audits can help you discover hidden issues, while listening to user feedback can uncover previously unknown broken links.

Here are some tools you can use to monitor 404 errors:

By combining automated solutions with manual reviews and user input, you can get a comprehensive view of your site's 404 status and address emerging issues promptly.

Server logs can be a treasure trove of information when it comes to identifying the root cause of 404 errors.

Analyzing server logs requires technical skills, as you'll be dealing with raw data containing detailed information about requests made by web clients, server responses, network traffic volumes, and other parameters.

By examining server logs, you can pinpoint exactly what happened, who initiated the error, and when it occurred.

This process is particularly effective in spotting 404 errors, as it reveals the precise sequence of events leading up to the error.

Server logs can be a valuable tool in monitoring and preventing 404 errors, especially if you're experiencing issues after making changes to your DNS settings or hosting provider.

To effectively monitor 404 errors going forward, it's essential to use website analytics tools like Hotjar, Mixpanel, or Google Analytics to get real-time notifications when users encounter these issues.

These programs provide valuable insights into the number of users who experience 404 errors, their source, the impacted pages, and the frequency of occurrence.

You can also leverage webmaster tools like Google Search Console to get detailed reports on 404 errors, along with suggestions on how to fix them.

Regularly checking these reports will help you identify and address 404 errors proactively.

Installing plugins or extensions designed for monitoring 404 errors, such as the Broken Link Checker plugin for WordPress or the Googlebot Crawl Errors Chrome extension, can also be beneficial.

Performing regular audits on your website, either manually or with the help of automated tools, will help you stay on top of 404 errors and prevent them from becoming a persistent issue.

Here are some ways to perform regular audits:

Error 404 is a standard HTTP status code that indicates a web page or resource cannot be found. It's a common issue that can occur due to a variety of reasons.

The HTTP protocol defines error 404 as a client-side error, meaning it's the user's browser that's unable to locate the requested resource.

A 404 error can be caused by a typo in the URL, a deleted or moved webpage, or even a misconfigured server.

Most web servers are configured to display a custom 404 error page, which can be a simple text message or a more elaborate page with links to other relevant content.

This custom error page can be used to provide a better user experience by suggesting alternative pages or search options.

In many cases, a 404 error can be fixed by simply correcting the URL or checking if the webpage has been moved to a different location.

You can use tools like Google Search Console, Google Analytics, or crawling software to find 404 errors on your website. These tools can help you discover 404 errors by analyzing external links, which is one way to find the 83% of 404s that are missed by tools that only crawl within one website.

Google Search Console and Google Analytics can also help you track traffic to 404 pages, which can be useful in understanding what 404s users reached on your site. This is especially helpful in identifying patterns and potential issues.

Analyzing user behavior across your website using web analytics services like Google Analytics, Adobe Analytics, or Piwik PRO can help you identify possible 404 errors that require attention. This can indicate high bounce rates, low session durations, and fewer conversions from certain pages or areas of your website.

Some common methods of tracking traffic to 404 pages include log file analysis and JavaScript-based traffic tracking tools. By using these methods, you can gain a better understanding of the 404 errors on your website and take steps to fix them.

Here are some tools you can use to track 404 errors:

Microsoft Server Substatus Codes are a set of decimal numbers appended to the 404 status code, providing a more specific cause of the error. These codes are not officially recognized by IANA and are not returned by non-Microsoft servers.

The substatus codes are used by Microsoft's IIS 7.0, IIS 7.5, and IIS 8.0 servers to indicate a more specific cause of a 404 error. IIS 7.0 and later versions define a total of 20 substatus codes.

Here is a list of some of the most common Microsoft Server Substatus Codes:

These substatus codes can be useful in diagnosing and troubleshooting 404 errors on Microsoft servers.