What is a 400 – Bad Request? (Proxies Explained)

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A 400 – Bad Request error is an HTTP status code that pops up when the server can't process a request due to something being off with the request itself. It’s a client-side issue, meaning the problem comes from the browser, tool, or proxy sending the request.

Common Causes of a 400 Error:

• Invalid URL: Typos, special characters, or formatting issues in the URL.
• Corrupt Cookies: Expired or broken cookies can cause problems.
• Oversized Headers: Request headers that exceed the server’s size limit.
• DNS Issues: Problems resolving the website’s address.

How It Impacts You

A 400 error stops you from accessing a webpage or resource, which can be frustrating and disrupt your workflow. For businesses, repeated errors can harm user experience and site performance.

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