How to Fix HTTP Error 431 in 5 Steps

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The “HTTP Error 431” is a technical error that users may encounter when accessing certain websites.

This error arises due to issues related to the request headers being too large for the server to process. While it may sound complex, resolving this error can be straightforward with the right approach.

In this guide, we will dive into the underlying causes of this error and provide systematic solutions to address it effectively

What is HTTP Error 431?

HTTP error code 431, titled “Request Header Fields Too Large,” indicates that the server refuses to process the request because its header fields are too large.

This error arises when the size of request headers exceeds server’s limits, potentially due to excessive amounts of cookies or oversized header values.

When encountered, it signifies the need to reduce the size of the request headers or optimize server configurations. Addressing this error ensures smooth communication between web clients and servers, maintaining web application functionality.

HTTP Error 431

What Causes HTTP Error 431?

HTTP 431 error can occur due to various reasons. Let’s look at some common reasons why this happens:

  1. Too Many Cookies: Computers gather small pieces of information known as “cookies” when you visit websites. Having an excessive number of these cookies can lead to this error.
  2. Long Web Address: If a website’s address (called URL) is very long, it can cause the computer to have trouble understanding it, leading to an error.
  3. Big Files in the Browser: When substantial files or extensions are integrated into a browser, they can transmit an excessive amount of information to the website, potentially triggering the error.
  4. Header Size: There’s a part called the “header” when computers talk to websites. If it’s too big, the website might say, “that’s too much!”
  5. Server Settings: The place where a website lives (called a server) might have rules about how much info it can take. If it’s relaxed, this error can pop up.

How to Fix HTTP 431 Error?

There can be many ways to fix the HTTP response error code. Clearing the cookies to disabling extensions are some of them. We have shared step by step instructions to fix the error code easily down below.

1. Clear Browser Cookies and Cache

Clearing browser data can help solve many web-related issues. Here’s how you can do it:

  • Open your browser’s settings or options.
  • Find the section related to “History” or “Privacy”.
Click History to
  • Choose to clear “Cookies” and “Cached data” (the exact terms might vary depending on the browser).
Click Browsing Data to avoid HTTP Error 431
  • Confirm and wait for the process to finish.
  • Restart your browser.

2. Check URL Length

A lengthy website address can sometimes cause issues. To avoid such problems:

  • Ensure the website address you’re trying to access is sufficiently long.
  • If using a bookmark, try accessing the website directly to avoid lengthy URL parameters.

3. Disable Large Extensions or Files

Extensions or large files can sometimes interfere with how a browser operates. To ensure smooth functioning:

  • Go to your browser’s extension or add-on settings.
Click Extensions under the Option More Tools
  • Review the list and temporarily turn off any recent or large extensions.
Disable Large Extension to avoid HTTP Error 431
  • Restart your browser and check if the error persists.

4. Adjust Request Header Limits

Adjusting the request header limits can help in accommodating more data without errors.

  • For website owners or administrators: Check your server’s configuration.
Check Server Settings
  • Increase the limit for the request header size if it’s set too low.
  • Save changes and restart the server.

5. Contact Website Administrator

In cases where the problem might not be on your end, it’s best to contact the website directly for assistance.

  • If the error continues and you believe it’s on the website’s end, reach out to the site’s support or administrator.
  • Please provide them with details like the error message and when it occurred to help them diagnose the problem.

How to Prevent HTTP 431 Error in Future?

For smooth web experience, we should avoid the error in future. Here are some essential steps to help avoid it.

  1. Regularly Clear Cookies: Periodically remove accumulated cookies from your browser to maintain its efficiency.
  2. Use Concise Web Addresses: Opt for shorter, direct URLs when accessing websites to minimize potential issues.
  3. Limit Browser Add-ons: Install only necessary extensions and add-ons to reduce the risk of complications.
  4. Update Browsers Consistently: Regular browser updates ensure you have the latest safeguards against errors.
  5. Access Reputable Websites: Prioritize visiting established and trusted websites to decrease the likelihood of encountering errors.


In conclusion, it’s important to know and fix the HTTP 431 error for smooth web browsing. As we mentioned, taking early steps can help you solve this problem.

If you face any issues or need more help. Don’t hesitate to contact us.

Fixing HTTP Error 431 in Windows FAQs

1. What is the HTTP Error 431 in Windows?

It’s an error that happens when the info sent to a website is too much for it to handle.

2. Why does this error occur on my Windows computer?

The error mainly pops up due to too many cookies, a very long website address, or when your browser has too many extensions.

3. How can I clear cookies in my Windows browser to fix it?

Open your browser’s settings, find “History” or “Privacy,” and choose to clear “Cookies.”

4. Can updating my browser help?

Yes, keeping your browser updated ensures it runs well and can help avoid errors like this one.

5. What if I still face the error after trying these steps?

If the error persists, consider reaching out to the website’s support or checking if your internet connection has issues.