If you can't access a website due to a 400 error, follow these steps.

Clear your DNS cache, which should fix the 400 Bad Request error if it's being caused by outdated DNS records that your computer is storing.

Fix 400, That’s an error, Your client has issued a malformed or illegal request on Chrome which is encountered while watching YouTube videos.

Error 400 in Roblox, Explained In a nutshell, Error 400 crops up due to a number of system-wide reasons, but they largely pertain to issues with the Roblox online servers.

How do I fix error 400 on my smart TV? If you see error 400 while watching online videos on your smart TV, first try reloading the video, then clear the app cache in your TV's settings.