What does Error 400 means and how to fix it

What does Error 400 means and how to fix it
Satyam Chaudhary
HTTP Status Codes Sep 05, 2023

In this blog article, we will discuss an error that commonly occurs while browsing the internet - Error 400. We will delve into the possible causes of this error and provide you step by step instructions on how to fix it

So, let's get started and learn what does error 400 mean and how to fix it

What is HTTP error 400 ?

HTTP error 400 is a "Bad Request" error. It indicates that the request sent to the server by the user's browser was incorrect or corrupted add could not be understood by the server.

Now let’s take a look at some of the error 400 variants.

Multiple Variations of the Error 400

The error 400, also known as the bad request error, can have multiple variations depending on the specific circumstances.

  • On common variation is the "400 Bad Request - Invalid URL" error, which occurs when the URL entered in the browser is not properly formed or contains invalid characters.

  • Another variations is the "400 Bad Request - Invalid Syntax" error, which is triggered when the server cannot understand the request due to incorrect syntax.

  • The"400 Bad Request - Unauthorized" error can occur when the user is not authorized to access the requested resource

Why Are You Getting an Error 400?

Here’re a few reasons why you might be getting an Error 400:

  1. Incorrect URL:

    One of the common reasons for encountering an Error 400 is by entering an incorrect URL in the browser's address bar.

  2. Invalid Input:

    Another reason for Error 400 is providing invalid input or data in a form or API request. Make sure to fill in the required fields correctly and follow the specified input format

  3. Bad Request:

    Error 400 is often referred as "Bad request" error. This means that the server could not understand the request sent by the client

  4. Expired or Missed Cookies:

    Cookies are small pieces of data stored by websites on a user's browser. If the required cookies are expired or missing it can result in an Error 400.

5 Methods to Fix the Error 400

There are several methods you can use to fix and Error 400. Here are five methods to help guide you through the process.

  1. Check the URL:

    Start by double-checking the URL in the address bar to ensure it is correct. Sometimes a simple typing mistake can lead to an Error 400

  2. Clear your browser cache

    Clearing the cache can help resolve any conflicts or corrupted files that may be causing the error.

    • Click the three dots on the top right then go to Settings

    • Tap on Privacy and security then on Clear browsing data .

    • You will find an option “Time range,” select All time

    • Then go to advanced and only select the top three options as shown in the below figure

    • There you will also find the option of “Time range,” select All time

    • Now simply Tap on Clear data.

  3. Disable browser extensions:

    Certain browser extensions or plugins can interfere with website functionality and trigger an Error 400. Disable any recently added extensions and see if the error persists

  4. Contact the website's administrator:

    If all else fails, contact the website's administrator and let them know you're getting a 404 error when trying to access the page.


In conclusion, resolving an Error 400 can be relatively straightforward process if you follow the appropriate steps. If you keep experiencing the issue, try talking to an experienced professional. It’s a client-side issue most of the time, and that’s why it’s easy to solve.

Remember to stay patient and methodical when troubleshooting an Error 400, as it is a common issue that can usually be resolved with some simple troubleshooting steps.

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Bad Request Error 400
HTTP Status Codes

Satyam Chaudhary

Satyam is a brilliant Engineering Undergraduate and proud Indian. He is passoinate towards web development and acquiring new skills.

He help students in understanding the concepts with a correct approach and solve their academic problems.

We are here to clear your doubts with an easy step by step approach.