What is the 400 Bad Request error? How to fix 400 Bad Request error

Similar to the 404 Not Found , 400 Bad Request error is also an HTTP status code indicating the request to send to the website server, usually requiring a web page to be downloaded, wrong or interrupted and the server does not understand this request.

Bad Request 400 error often has different messages on each website, below is a list of some common error message types:
400 Bad Request error

  • 400 Bad Request
  • Bad Request. Accessed by the browser of a request cannot authenticate this machine.
  • Bad Request - Invalid URL
  • HTTP Error 400 - Bad Request
  • Bad Request: Error 400
  • HTTP Error 400. The hostname request illegal.
  • 400 - Bad request. The server request cannot be authenticated due to the malformed command. Users should not be defining requirements without conditions.
  • Interface 400 Bad Request error message

400 Bad Request error appears inside the web browser window. This error can appear on any operating system and browser.

For example, Internet Explorer , the message message The webpage cannot be found is assigned to the 400 Bad Request error. The IE title bar indicates HTTP 400 Bad Request or similar notification.

Windows Updates also reports an HTTP 400 error but displays it as an error code 0x80244016 or with the message WU_E_PT_HTTP_STATUS_BAD_REQUEST.

Error 400 is reported with the path in the Microsoft Office application that often appears as a server return error: (400) Bad Request in a small pop-up window on the screen.

The cause of the 400 Bad Request error
Error 400 often occurs when entering or pasting the wrong URL in the address bar, sometimes a few common errors that many users encounter.

Note: web servers running Microsoft IIS often provide more specific information about the cause of the 400 Bad Request error by adding a digital suffix behind 400 error, such as HTTP Error 400.1 - Bad Request, ie Error Invalid Destination Header.

Error message 400

How to fix 400 Bad Request error
Check for errors in the URL
The main cause of error 400 is the wrong entry of the URL or clicking the wrong link from another source, such as articles, documents ... Usually this is a typing error.

You only need to check the directories following the main domain name (separated by /), unused characters in the URL, special characters ...

Delete browser cookies
When you encounter a 400 Bad Request error with Google services, many sites will report a 400 error when the cookie reads data that is corrupt or obsolete.

Delete DNS cookies
The DNS cookie deletion will fix the 400 Bad Request error if the DNS record stored on the computer is outdated. To do this, simply enter ipconfig / flushdns from the Command Prompt window. Note that this operation is not the same as deleting the browser cache.

Clear the browser cache
The cache containing the copy of the website's error that you are trying to access may cause 400 errors. Although clearing the cache is unlikely to completely fix the 400 error, it is also an option you should not ignore because of the fact. does quite fast and easy.

Diagnose errors
Users can choose to diagnose errors right on the notification, similar to the 504 Gateway Timeout error, although this error is usually reported as 400 Bad Request.

In other rare cases, 2 servers take too long to connect to each other (Gateway Timeout error) but cannot fix this 504 error, you can report the error as 400 Bad Request.

Check the file upload size
When uploading the file to the website and encountering this error, the possibility of error 400 is due to the file being too large and denied by the server.

Check computer or network connection
If you encounter 400 error in most wesbite access, the cause may be computer or Internet connection. Run network speed tests and check with your network service provider to make sure everything works well.

Contact the website administrator
If the problem is not on your side, contact your website administrator for assistance. This not only helps you get access to the webpage soon but is also useful information for the website management team.

There is a trick, if all websites are stuck with 400 Bad Request errors, look on Twitter for hashtag #websitedown, #facebookdown or #gmaildown . There will be other users reporting this error and you can refer to how to fix the error in the comment section.

If the above methods are not really effective, do not waste time downloading and reloading the website. Please come back at another time, maybe the 400 error will disappear?
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