The 400 bad request error is a type of Hypertext Transfer Protocol(HTTP) response status code. The 400 error is an apparent client error. As the name suggests, the error occurs when your request that you sent to the website server often something simple like a request to load a web page, was somehow wrong or consists of some faults and the server couldn’t understand it. The error message generally pops up when you enter the wrong URL in the address bar.

How To Identify a 400 Bad Request Error?

400 Bad Request errors, like all errors of this type, is displayed inside the internet web browser window. It can be seen in any operating system and any browser. You may think identifying is very easy as you will recognize it right after you see the error number but you could see something apart from the number “400”. Here is a list of some examples of the 400 Bad Request Error messages.

  1. 400 Bad Request.
  2. Bad Request: Error 400.
  3. Bad Request- Invalid URL.
  4. HTTP Error 400 – Bad Request.
  5. HTTP Error 400. The request hostname is invalid.
  6. 400 – Bad request. The request could not be understood by the server because of the malformed syntax. The client should not repeat the request without making changes.
  7. Bad Request. Your browser sent a request that this server could not comprehend. 

These are just some examples. You should be able to identify the 400 error based on the examples mentioned above but there are only rare cases of 400 error messages except the ones listed above.

How To Fix the 400 Bad Request Error?

1)Check the URL:

Since this error is mostly caused by some mistakes in the URL, you should check for errors in it. Check for extra, typically non-allowed, characters in the URL like a percentage character. While there can be perfectly valid uses for something like a % character, you won’t often find one in any standard URL. This process will probably fix your problems and you will not have to go below. 

2)Clear your browser’s cache:

 Clearing your cache is unlikely the correction for the majority of 400 bad request issues, but it’s quick and easy and worth trying. You should try this as caches and the 400 errors are somewhat related. A cached copy of the web page that you are trying to access could be corrupt and so can be the root of the problem that’s displaying the 400 error.

3)Clear your browser’s cookies:

If you are getting a Bad Request error, with a Google service then this might be the case and this could solve your problems. To solve this problem you just need to clear your browser’s cookies.

4)Clear your DNS cache:

Firstly, this is not the same as clearing your browser’s cache. Outdated DNS records that your device is storing could be the reason behind this glitch. You can clear your DNS cache by executing ipconfig /flushdns from a Command Prompt window.

5)Troubleshoot as 504 Gateway Timeout:

Sometimes, two servers may take too long to communicate (a gateway timeout issue) so it will incorrectly, or at least unhelpfully, report the problem to you as a 400 Bad Request. Even though the chances of this happening are rare, troubleshooting the problem as a 504 Gateway Timeout issue instead doesn’t hurt.

6)Check your Internet connection:

Sometimes your device can display this error message even if the problem is with your Internet and not your URL. You can check if this is the case by visiting other websites, if the same message is being displayed on every other website then you might have an issue with your internet.  Therefore it is advisable to run an internet speed test or contact your ISP to make sure everything is configured correctly.

7)Decrease the file size:

This solution is only in the case you are trying to upload a file to a website and you see the error message. If the URL is perfectly fine, then it means that the file is too large to be uploaded and the server is rejecting it. There is no other option other than decreasing the file size.

8)Contact the website:

If nothing above has worked, and you’re sure the problem isn’t with your computer, you can do nothing but contact the host of the website. Even if it is a client-side issue, there could be some problems with the host. Contact them and let them know about your problem, this will help you as well as them.

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