Cookies are small pieces of data from websites that are stored on a user’s web browser. They help a website function according to your usage and personalize your activity.
Cache is a quick storage that your web browser refers to when revisiting a website. Instead of downloading the same information every visit, the browser reuses the previous information which reduces traffic and load time.
A 400 Bad Request occurs when a web server doesn’t like your request. Maybe your request doesn’t make sense or you’re asking for too much. The simplest way to fix your request is by resetting your cache and cookies.