What is Error Code 494 in Chrome?
Fast answer first. Then use the tabs or video for more detail.
- Watch the video explanation below for a faster overview.
- Game mechanics may change with updates or patches.
- Use this block to get the short answer without scrolling the whole page.
- Read the FAQ section if the article has one.
- Use the table of contents to jump straight to the detailed section you need.
- Watch the video first, then skim the article for specifics.
The 494 Request Header Too Large error is an HTTP status code that indicates a client-side problem. Specifically, it signifies that the HTTP request header sent by your browser, in this case Chrome, is too large for the server to process. This error prevents the server from understanding the request and ultimately displaying the webpage you were trying to access. It’s a client error, meaning the issue lies within the request coming from your browser rather than the server itself. Think of it like trying to send a huge package through a small mailbox – the mailbox (server) simply can’t handle the oversized item (your request).
Understanding the Root Cause
The 494 error is triggered when the HTTP request sent by your Chrome browser exceeds the size limit configured on the server. This limit is put in place to protect servers from malicious attacks and inefficient resource usage. The most common culprits behind an oversized request header include:
- Excessive Cookies: Cookies are small text files websites store on your browser to remember preferences and login information. When a website sets a large number of cookies, or if these cookies become excessively large, they bloat the header of every request made to that website. This is a frequent cause of the 494 error.
- Lengthy User-Agent Strings: The user-agent string identifies your browser and operating system to the server. In some cases, these strings can grow excessively long, especially if you have many extensions installed. This can contribute to the excessive size of the request header.
- Other Metadata: Beyond cookies and user-agent strings, other types of metadata sent within the header such as custom headers added by extensions or specific website elements, can also contribute to an oversized request.
- Browser Extensions: Some browser extensions can inject data into the request header, sometimes adding unnecessary information. This can lead to an oversized header and trigger the 494 error.
- Temporary Glitches: Occasionally, temporary issues or glitches in your browser, or even the server, might incorrectly cause a 494 error.
How to Fix Error Code 494 in Chrome
Resolving the 494 error requires you to address the underlying issue of the oversized header. Here are several troubleshooting steps you can take to fix this problem:
- Refresh or Reload the Page: The simplest solution to start with. Sometimes, the error may have been temporary. Refreshing the page (Ctrl + R or Cmd + R) might clear any transient issues and allow the page to load successfully.
- Clear Browser Cookies: The accumulation of too many or too large cookies is often the primary reason behind a 494 error. Clearing cookies for the specific website causing the issue or clearing all cookies in your browser might help. In Chrome, you can do this by going to
chrome://settings/privacy, clicking on “Clear browsing data,” choosing “Cookies and other site data,” and then clicking “Clear data.” Be aware that clearing all cookies may log you out of websites. - Clear Browser Cache: Accumulated cached files can also cause conflicts. Clear the browser’s cache alongside cookies. Again, you can find this in the “Clear browsing data” section in Chrome’s settings, choosing “Cached images and files” before clicking “Clear data.”
- Disable Browser Extensions: Temporarily disable all browser extensions to see if one of them is adding extra data to the header and causing the issue. If disabling all extensions solves the problem, you can re-enable them one by one to isolate the culprit.
- Use Incognito/Private Mode: Open the affected website in an incognito/private window (Ctrl+Shift+N or Cmd+Shift+N). If it loads successfully in private mode, it indicates an issue with your normal browsing session, like an extension conflict.
- Update Chrome: Make sure you are using the latest version of Google Chrome. Outdated browsers can sometimes have bugs or issues related to data handling that could lead to the 494 error.
- Try a Different Browser: If the problem persists, try opening the website in a different browser such as Firefox or Safari. If the site works in another browser, the issue is likely related to Chrome, and further troubleshooting might be needed within Chrome specifically.
- Check the User-Agent String: Although less likely to be the primary issue, a very long or improperly formatted user-agent string could contribute to the problem. There is usually no user adjustable way to directly fix this, but if you suspect your user-agent may be altered, try resetting Chrome to default settings. This can be found under Advanced section of settings.
- Restart Your Computer and Router: Sometimes a simple restart of your computer and internet router can resolve issues that may be causing the error.
Frequently Asked Questions (FAQs)
1. What exactly does “Request Header Too Large” mean in the context of HTTP errors?
It means that the HTTP request header sent by the browser to the server is bigger than what the server is configured to accept. This oversized header prevents the server from processing the request.
2. Is a 494 error a client-side or server-side problem?
A 494 error is a client-side error. This means the problem originates from the browser’s request, not from a fault in the server.
3. How do cookies cause a 494 error?
Excessive or very large cookies add to the size of the HTTP request header with every request to a given domain. If a website sets many cookies, or large cookies, the header size may exceed the allowed limit.
4. Can browser extensions cause the 494 error?
Yes, some browser extensions might add extra, unnecessary data to your HTTP headers. This can increase the header size and lead to the 494 error.
5. Why does refreshing sometimes resolve a 494 error?
Refreshing clears any transient issues or temporary glitches that might have caused the error, and ensures that the data is re-submitted to the server which can sometimes resolve a temporary oversized header.
6. Does using incognito mode help with 494 errors?
Yes, incognito mode disables browser extensions and uses a fresh profile, which bypasses many common causes of oversized headers, such as faulty or overloaded cookies and extensions.
7. Can the 494 error impact other browsers, besides Chrome?
Yes, although the error is related to the request, it is not isolated to Chrome. Any browser can experience a 494 error if the request header sent to the server is too large. The troubleshooting steps will be similar in all browsers, though may vary slightly in specific location within browser options.
8. Is a 494 error the same as a 404 error?
No. A 404 error means “Page Not Found,” indicating that the server can’t locate the requested resource. A 494 error means “Request Header Too Large” and indicates an issue with the request header itself.
9. What is the link between 494 errors and CloudFront?
CloudFront, a CDN by Amazon Web Services, can also return a 494 error when the origin server is not able to handle oversized header requests. Troubleshooting may need to focus on both the client side (browser) and server-side, particularly if using a CDN.
10. Can a weak internet connection cause a 494 error?
A weak internet connection will typically result in a more general error or timeout rather than a 494 error. However, very poor connections can sometimes lead to incomplete or corrupted request headers, but it is not a direct cause for the specific error.
11. How often do websites set cookies, and why are they so numerous?
Websites set cookies to track user preferences, maintain login sessions, and personalize content, which is required by many web applications. Over time, these cookies can accumulate, resulting in an oversized header.
12. If clearing cache and cookies doesn’t help, what should I do next?
If clearing cache and cookies doesn’t help, try disabling browser extensions one by one to identify if one is injecting unnecessary information in the header. Also, consider trying a different browser or restarting your computer and router.
13. Is the user-agent string size common cause of 494 errors?
The user-agent string is less likely to cause the error compared to cookies or extensions. However, if you have a lot of extensions, or if your user-agent string has been changed for some reason, it could contribute to a larger header.
14. Do I need to contact the website admin if I see a 494 error?
Typically, this is a problem you can fix on your end. However, if the error persists after all troubleshooting steps, the issue might be on the website server-side, and it wouldn’t hurt to reach out and notify the site administrator.
15. Is there a way to check my HTTP request header size directly?
While Chrome developer tools can show the HTTP request header, there’s no straightforward way to directly view the overall size. However, examining the request headers in dev tools can give clues to what might be contributing to a large header if you are a more technical user. You can do this by right clicking anywhere on a webpage, selecting “Inspect” or “Inspect Element”, clicking on the “Network” tab and reloading the page. The request header for each resource will then be available for review.
By understanding the causes and applying the solutions outlined above, you can effectively troubleshoot and resolve the 494 Request Header Too Large error in Chrome, ensuring a smoother browsing experience.