Understanding the 406 Not Acceptable Error: Causes and Solutions

Are your clients facing a 406 not acceptable error on their browsers? Is this affecting their experience and, consequently, your brand image? If your answer to these questions is yes, then this article is for you.

The 406 “Not Acceptable” HTTP status code means that the server is unable to give the requested content in the format that the client (browser) can accept. This occurs because of issues like mismatch in content types, incorrect Accept header, and server configuration issues.

Solving this error is crucial to ranking higher on search engines, giving a positive user experience, and preventing the overloading of server resources. In fact, 88% of online viewers are not going to return after a negative experience.

To help you with this, we will take you through the causes and solutions of the 406 not acceptable error.

What Causes the 406 Not Acceptable Error?

To be able to understand what causes the 406 not acceptable error, you will need to know about HTTP request-response cycles. This can be caused by:

Accept-Ranges

This refers to how some servers have security measures that allow only a specific file size range in the response. Thus, if the response is bigger than this range, then it will lead to this error.

Accept-Encoding

This is the area of the header meant for compressing the files so they move quickly from the server to the browser. However, because some compression formats and methods are not accepted, it results in 406 errors.

Accept-Charset and Accept-Language

This refers to the character set and how site file tables code like CSS and HTML to turn these into understandable characters. This is an important cause because of the multiple characters, languages, and symbols in the world.

While the standard table is called ISO-8859, there are other complementary tables and even new tables that are being added to keep up with the character and language additions. Accept-language is similar to accept-charset, except that it focuses on international languages.

MIME Type Violation

Sometimes, the browser requires a specific type of MIME from the server to be able to respond correctly. Thus, if the server is unable to give the specific MIME type required, you will see this error. Considering that MIME types are basically content elements, they include JPEG images, simple texts, or specific video formats.

Best Practices for Fixing the 406 Not Acceptable Error

The best ways to troubleshoot this problem and prevent it from happening again in the future are:

Check the URL

An invalid website URL that can cause this error might be mistyped, have an improper format or be outdated. Such URLs may result in requests for server resources that are either unavailable or wrongly interpreted.

Correcting the URL ensures that the request is sent to the correct resource location and format, allowing the server to comprehend and process it.

Restart Your Internet and Devices

This is a common troubleshooting fix as it helps in solving multiple types of network-related problems, including the 406 not acceptable error.

This solution will work only if the error is due to DNS issues, temporary network glitches, or stale configurations on your device.

Restarting works because it helps in clearing temporary configurations and cached data that might be causing the error. It will also help refresh your network connection.

Revert Recent Changes to Your CMS

Changes to your content management system (CMS), like WordPress, can lead to this error if the way the content is served or requests are handled is changed. This is especially applicable if the configurations or content types are in a format that is not accepted by the server.

By reverting to the older version, you undo any modifications that have conflicted with the server’s ability to respond to requests with acceptable content types.

Additionally, it will also help you identify the cause of the error and restore the functionality.

Delete and Reinstall Website Themes, Plugins, and Extensions

While these elements usually enhance the functionality of a website, they can lead to compatibility issues and conflicts, leading to the 406 not acceptable error.

This is likely if these elements are corrupted, outdated, or not completely compatible with the server’s configuration. By deleting and reinstalling them, you will ensure that they are updated and free of corruption, thus removing the error.

Go Through the Database and Server Logs

Critical information that helps your website function properly is stored in databases. If your database contains any illegal changes or errors, the server may be unable to retrieve or process data appropriately.

By reviewing the database and server logs, you can detect and resolve issues affecting your content delivery.

In fact, it will help you ensure the proper configuration of the database and servers. This allows the server to process requests accurately and deliver acceptable content types.

Conclusion

The 406 not acceptable error has a direct effect on your website’s functioning and SEO rankings. It is important to identify the causes of this error and then use the right solution to fix it. This guide will be able to guide you through the same.

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