Error Code: What It Means and How to Fix It


The HTTP 400 Bad Request error code signals a problem with the client’s request to the server. It’s a generic client-side error indicating that the server couldn’t understand the request due to malformed syntax or invalid request message framing.

Common Causes of HTTP 400 Errors

  1. Malformed URL: A common cause of the HTTP 400 error is a malformed URL. This can include invalid characters, incorrect syntax, or excessive query parameters.
  2. Invalid Cookies: Sometimes, corrupted cookies can lead to a 400 error. The server might fail to read the session data due to invalid cookies, making it necessary to clear them.
  3. Incorrect Request Body: Sending an invalid or improperly formatted request body, such as JSON data with missing fields or wrong types, can result in a 400 error.
  4. Missing Host Header: The HTTP 1.1 protocol requires the Host header in requests. If this header is BTC Users Number missing or incorrectly formatted, the server may respond with a 400 error.

How to Diagnose and Fix HTTP 400 Errors

  1. Check the URL: Verify the URL for any typos or incorrect parameters. Make sure it’s correctly new zealand phone number encoded and doesn’t contain disallowed characters.
  2. Clear Cookies: Clearing your browser’s cookies can resolve issues related to invalid or corrupted cookies. This is particularly effective if the error persists across different URLs of the same site.
  3. Validate Request Body: If you’re sending a request with a body (e.g., POST or PUT), ensure the data is correctly formatted and matches what the server expects. Using tools like Postman can help test and format your request body properly.
  4. Review Request Headers: Ensure all required headers, especially the Host header, are correctly included in your request. Properly configured headers can prevent misunderstandings between the client and server.


The HTTP 400 error code is a catch-all for a variety of client-side issues. By methodically checking the URL, cookies, request body, and headers, you can often quickly resolve these errors. Regular validation of your requests and adherence to API documentation can also help minimize occurrences of the HTTP 400 error.

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