Fixing HTTP Error 400 Bad Request

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The response status code is an error with HTTP (HyperText Transfer Protocol) 400 request indicates that the server cannot or will not process the request due to a client error (e. g. incorrect request syntax, incorrect framing of request messages or misleading routing of requests).

A 400 Bad Request error occurs when a server cannot understand a request it has made. This is an error 400 because it is the HTTP status code that the web server uses to describe this type of error.

When you report an error, you must also return a response form containing more information about the error. If your client is a browser, it can be a user-friendly HTML page. A 400 means that the request was incorrect. In other words, the data flow sent by the client to the server did not comply with the rules.

In the case of a REST API with a JSON payload, the 400s are typically, and I would say correctly, used to indicate that the JSON is somehow invalid according to the API specifications of the service.

Any website, depending on your web browser, the problem and the software used to host this website, may return some variants of the 400 Bad Request error, including :

  • 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.

Refresh the page

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Updating the page is always worth a try. Often, error 400 is temporary, and a simple update can do the trick. Most browsers use the F5 key to refresh and also offer a refresh button somewhere in the address bar. It doesn’t solve the problem very often, but it only takes a second to try it.

Correct the DNS record


Another solution you can try is to clear your DNS cache. When you surf the Internet, the domain names you enter are translated into IP addresses, which connects them to the World Wide Web. To do this, you must first perform name resolution with a name server. To shorten this process, your PC temporarily stores the collected data in the DNS cache. However, the next time the domain is entered in the browser and the entry has not yet been automatically deleted from the cache, the name resolution takes place directly from the cache. If this entry is corrupted or no longer up to date, the message ‘HTTP Bad Request’ appears.

To delete the wrong entry, you must delete the entire DNS cache. This can be done by running the command prompt in Windows and typing this command to clear the cache:

ipconfig /flushdns

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