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

Similar to the 404 Not Found error , the 400 Bad Request is also an HTTP status code that indicates that the request you sent to the web server, usually a request to load a website, is wrong or interrupted and the server does not understand this request.

Error 400 Bad Request usually has different messages on each website, here is a list of some common types of error messages:

• 400 Bad Request
• Bad Request. Your browser sent a request that this server could not understand.
• Bad Request - Invalid URL
• HTTP Error 400 - Bad Request
• Bad Request: Error 400
• HTTP Error 400. The request hostname is invalid.
• 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.

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

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

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

The 400 error reported along the path in the Microsoft Office application often appears as a server error: (400) Bad Request in a small on-screen pop-up.

The cause of the 400 Bad Request error

Error 400 usually occurs when typing or pasting the wrong URL in the address bar, sometimes some 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 after the 400 error, such as HTTP Error 400.1 - Bad Request, i.e. error Invalid Destination Header.

How to fix the 400 Bad Request error

Check for errors in the URL

The main cause of the error 400 is due to entering the wrong URL or clicking on the wrong link from another source, such as articles, documents ... Usually this is a typo.

You only need to check the list followed by the main domain name (separated by /), characters not allowed in the URL, special characters ...

Clear browser cookies

When encountering a 400 Bad Request error with Google services, many pages will report a 400 error when the cookie reading data is corrupt or too old.

Delete the DNS cookie

Removing the DNS cookie 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 is not the same as clearing the browser cache.

Clear the browser cache

A cache containing a faulty copy of the website you are trying to access can cause a 400 error. Although clearing the cache may not completely fix the 400 error, it is also an option you should not ignore because It is pretty fast and easy.

Error diagnosis

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

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

Check upload file size

When uploading a file to the website and encountering this error, the possibility of error 400 is because the file is too big and the server rejected it.

Check your computer or network connection

If you get the error 400 in most accessed websites, the cause may be the computer or the Internet connection. Run network speed tests and check with your network service provider to make sure everything is working properly.

Contact the webmaster

If the problem is not on your side, contact the website administrator for assistance. This will not only help you get to the webpage soon, but also be helpful information to the website management team.

The trick is, if the whole website is getting 400 Bad Request errors, look for Twitter for hashtags #websitedown, #facebookdown or #gmaildown . There will be other users who report this error, and you can refer to how to fix the error in the comments.

If the above methods do not really work, do not waste time downloading the website again and again. Come back another time, maybe the 400 error will go away?