How to Fix WordPress Admin Ajax 400 (Bad Request) Error

[Habib01]

Share Tweet Share
Running into errors while managing your WordPress site can be frustrating, especially when you’re not sure what’s causing it.

WordPress Admin Ajax Error 400 (Bad Request) is one of these common and confusing errors. In our experience, it mostly occurs when a code snippet triggers a browser request that the server cannot understand, resulting in the “400 Bad Request” message.

The good news is that this error is usually easy to fix. In this guide, we'll explain what causes the 400 (Bad Request) error and show you how to fix it quickly.

Fixing the admin-ajax bad request error in WordPress
What causes error 400 (Bad Request)?
The 400 (Bad Request) error is usually caused by code that triggers a browser south africa telemarketing data request that the server cannot understand.

This is a common WordPress error . However, the error message does not provide any further clues, making it difficult for beginners to resolve.

You may see a “400 Bad Request” error message in your browser. The error page may look a little different depending on your WordPress hosting provider.

400 bad request generic error
It can also be seen when using the Inspector tool and switching to the “Console” tab.

If the request was made to the file admin-ajax.php, it will look like this:

Admin ajax 400 bad request error in browser console
The most common causes of this error that we have encountered include:

1. Invalid or malformed URL

One of the main reasons for this error is a typo or unnecessary characters in the URL .