5 Easy Ways To Overcome The 400 Bad Request Error On Your Website

Have you ever encountered a 400 Bad Request error while browsing the Internet? Or when you edit a website, a 400 Bad Request error suddenly appears? Do not worry, because you have come to the right place!

In this article, we will discuss 400 bad requests in detail. Start from what 400 Bad Request is, its causes, and of course how to solve it.

What are 400 bad requests?

The 400 Bad Request error is an error that occurs when the server does not understand the request of a website visitor. This misunderstanding is caused because the request is incorrect or corrupt in the middle of the data transfer process.

This 400 bad request will display a different error on each site. Here we provide a list of 400 common request errors that are common:

  • 400 Bad Requests
  • Bad requests. Your browser has 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 requests. The request could not be understood by the server due to malformed syntax. The client should not repeat the request without modifications.

The list of errors above occurs for a number of reasons – which we will only cover below. But overall, the problem is with the client side (site visitors), not the server side.

Also read: 10+ ways to check website or not easily [Terlengkap]

Cause 400 Bad Request

There are several things that cause 400 bad requests, namely:

Invalid URL

A 404 Bad Request error might occur because you entered an incorrect URL, the syntax was problematic, or the URL contained characters that were not allowed. Below is an example of a URL with inadmissible characters that the server could not process:

You can see in the URL above there are characters % which should not be there. When you open the above URL with Google Chrome, you will get an error like this:

Also Read: Causes Of The 502 Bad Gateway Error And How To Fix It

Corrupt cupboard and cookies

Although the URL you entered is 100% correct, the 400 Bad Request error may still occur, you know. This is usually because of the expiration or corruption of files in the browser box and cookies (corrupt).

You may have experienced this when you tried to sign in to WordPress after not logging in for a long time. This happens because your login cookie is corrupt, so it may not provide admin support as usual. Eventually your connection will be rejected and a 400 Bad Request error will appear.

3. DNS Cache Problems

As we explained in the article → What is DNA? With understanding, features, how it works and how to set it up, DNS is in charge of changing domain names into IP addresses that computers can understand.

Data of the conversion process by DNA is stored locally on your computer in the form of a DNA box. Well, the 400 Bad Request error can also occur when the DNS cache data stored locally does not match the DNS on the current Web site. Maybe the DNA of the site has been updated or changed.

4. File size too large

Another cause of 400 Bad Requests occurs when you upload a file that is too large for the server to process. Each server has its own limitations, so this 404 Bad Request error is different on each site.

5 Ways to Overcome 400 Bad Requests

Below we will explain how to resolve 400 bad requests. Oh yes, methods number one to four below can be done by visitors or website owners. While method number five is only a special solution for website owners. Strength!

1. Double-check the URL type

The first way you can try is to double-check the URL you just typed in the browser. Although it sounds trivial, this typo is the most common error associated with 400 Bad Requests, you know.

So make sure the domain name and the page you want to access is correct. Check again that the URL is separated by a hyphen (). If the 400 Bad Request error still appears, it’s time to try the second method.

2. Wipe your browser box

The 400 Bad Request error can occur if the web file stored locally in your browser is corrupted. The files are:

  • HTML
  • JavaScript
  • Text / configuration file
  • CSS
  • Media (image, video, audio)
  • Data files (XML, JSON)

The files above are automatically saved by the browser when you first visit the website. Because this box helps the browser to work efficiently without the need to download the same file every time you visit the website. Therefore, you need to clean the browser box so that the old corrupt data is deleted.

How to? If you use Google Chrome or Mozilla Firefox, you can follow the guide in → How to Clean Cabinet in Chrome effortlessly !.

However, if you are using Microsoft Edge, Opera or Safari, you can find a guide to clearing your locker in → How to clean your browser locker

3. Delete cookies in your browser

If browser cabinet cleaning still does not work, you can also try deleting browser cookies. One website may use dozens of different cookies. If even one of these cookies expires or is damaged, a 404 Bad Request error will appear.

For example, if you use Google Chrome, you can delete cookies by right-clicking on the three-dot icon and then selecting More tools> Delete browsing data from the popup menu that appears.

After that, make sure that Cookies and other site data have you noticed and Time series is at of all times. If so, just click on the blue button Clear data.

After deleting the cookies, you can reopen the site that previously had 400 bad requests.


4. Delete DNA box

A corrupt DNA box could also be the cause of the 400 Bad Request error. Therefore, you must delete all DNA records (DNS Coil) stored on the computer.

Clearing this DNA box is for everyone else operating system. But do not worry, we have explained all the ways in one article. You can find a guide to cleaning DNS cabinet in → How to flush DNS cabinet quickly and easily

5. Compress files before uploading to website (Special for website owners)

As we mentioned above, one of the causes of the 400 Bad Request error is that the file size uploaded to your site is too large.

Some hosting do limit the file upload size of each website and sometimes they are not transparent about it.

The solution to this 400 Bad Request is to try uploading a smaller file first. If it works, it means that the previous file was too large and you need to compress it.

To compress images and PDFs, we have provided a guide in the article → 3 + How to compress files to make websites fast.

As for video files, you should first upload them to YouTube instead of uploading them directly to the site. Because in general, even when compressed, the video size is still larger than the host limit.

Now that the video has been uploaded to YouTube, you can embed the video on the site. How to embed YouTube videos? You can follow the guide at → 3 Ways to Embed YouTube Videos on WordPress Website


After reading this article, you do not have to worry if you get a 400 Bad Request error, as there are several ways to handle this 400 Bad Request. The 400 Bad Request error is generally a problem caused on the client (visitor) side, not the server side. So, if you are a website owner, you do not need to panic about this error.

However, there are times when the 400 Bad Request error occurs on the server side. Having it is the only way that can be done to contact your hosting company. So make sure your host customer service is always available 24 hours.

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