HTTP ERROR 400 error reason

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An HTTP 400 Bad Request error means the server cannot process your request because the request is broken, corrupted, or has invalid syntax. Developers note on Stack Overflow that this is a client-side issue, meaning the problem originates from what your browser or app sent. [1, 2]

Common Reasons

Typoed URL: Wrong characters, spaces, or symbols inside the web address.
Bad Cookies: Old or broken cookies saved in your browser.
Full Cache: Saved website data that does not match the live site.
Large Files: Trying to upload a file that is too big for the server.
Header Issues: Browser headers that are too large or malformed. [1, 2, 3]

Quick Fixes

Check the address: Look for typos or weird symbols in the URL bar.
Clear data: Delete your browser cache and cookies.
Try incognito: Open a private window to see if it loads.
Refresh: Reload the page or restart your browser. [1, 2, 3]

If you are a developer seeing this in an API or app, or if you are trying to fix a specific website, please share more details so I can give you the exact solution.