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Status 400 error code error

The HyperText Transfer Protocol (HTTP) 400 Bad Request response status code indicates that the server cannot or will not process the request due to something that is perceived to be a client error (for example, malformed request syntax, invalid request message framing, or deceptive request routing).

How to Fix a 400 Bad Request Error

  1. Double Check the Domain Address. …
  2. Search the Keyword. …
  3. Clear Browser Cache or Cookies. …
  4. Turn Off Browser Extensions. …
  5. Check the File Size. …
  6. Flush DNS Cache. …
  7. Contact the Site Owner to Report the Error. …
  8. Restart Your PC and Other Hardware.

Background

The 400 (Bad Request) status code indicates that the server cannot or will not process the request due to something that is perceived to be a client error.[2]  In response to an invalid request, the server should issue the exact 4xx code in the case of an unsuccessful request.

Common Causes

A 400 Bad Request error is usually the result of entering the wrong URL in the browser address window, or by making mistakes in a link’s address when linking from page to page. 

How to fix 400 Errors

  • Check that the entered URL is correct: The URL and link syntax should be correct, and the target URL should exist. You can use Ryte’s Website Success to crawl a website and ensure all link targets are a 200 Success code. 
  • Clear your DNS Cache: The errors might be being displayed as your computer is storing outdated DNS records. Execute ipconfig/flushdns from a Command Prompt to do this. 
  • Clear your browser cache: Another reason could be that your cached version of the page is still suffering from the 400 status code error. In your browser’s History, you can clear your cache that would resolve this problem. 
  • Clear your browser’s cookies: While you’re there in your browser’s History, you could also clear your cookies. This is the best practice when you’re getting a Bad Request error on a Google site or service. 

Here are some variations of the 400 bad request error message you may encounter:

  • HTTP Error 400
  • HTTP Error 400 – Bad Request
  • HTTP Error 400. The request hostname is invalid
  • 400 Bad Request
  • 400 – Bad Request. The request could not be understood by the server due to malformed syntax. The client should not repeat the request without modifications.
  • 400 Bad Request – Request Header Or Cookie Too Large
  • Bad Request – Invalid URL
  • Bad Request – Error 400
  • Bad Request – Your browser sent a request that this server could not understand

How to Fix a 400 Bad Request Error

The first action we recommend is refreshing the page. If that doesn’t work, then you should try the following methods.

1. Double Check the Domain Address

One of the most common causes of HTTP status 400 bad request error is a wrong URL. This may include a mistyped URL, malformed syntax, and illegal characters in the URL.

2. Search the Keyword

There may be cases where you are sure that the URL is correct, yet the error persists. If you know the title of the article or page you’re looking for, search the keywords on the website or a search engine. Sometimes you can even see the title on the URL.

3. Clear Browser Cache or Cookies

Browser cookies and cache store site data and content on the client’s side to improve the browsing experience.

4. Turn Off Browser Extensions

Browser extensions can also cause a bad request error 400. That’s because these extensions interfere with the request sent to the web server, which may lead the web server to interpret the request as invalid.

5. Check the File Size

Trying to upload a file that exceeds the server file size limit might trigger an HTTP status 400 bad request error. Sites usually have a different file upload limit, so check if the file you want to upload fits the limit.

6. Flush DNS Cache

When you visit a site for the first time, the system goes through a DNS lookup, which searches for the nameservers and IP addresses that are associated with the domain name.

7. Contact the Site Owner to Report the Error

If all attempts to fix the 400 bad request error didn’t work, there’s a possibility that the problem isn’t a client error but rather is a misconfiguration that the web owner needs to fix.

8. Restart Your PC and Other Hardware

The last method is to restart your computer and network connection hardware, such as router and modems.

Conclusion

The HTTP status 400 – bad request indicates that the request sent to the server is invalid or corrupted. Just like other 4xx status codes, a 400 bad request is a client-side issue.

It can be caused by malformed request syntax, invalid request message framing, or deceptive request routing.

Since this is a client-side problem, users can easily resolve most of the 400 bad request errors. To recap, here are eight methods to resolve the error:

  1. Double-check the domain address.
  2. Search the keyword.
  3. Clear browser cache and cookies.
  4. Turn off browser extensions.
  5. Check and reduce the file size.
  6. Flush the operating system’s DNS cache.
  7. Report the error to the site owner.
  8. Restart the PC and networking equipment such as the router and modem.
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