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Failed to load resource: the server responded with a status of 400 (Bad Request (Request Header too long))

During development, my web debugging sessios suddenly started to fail with a 400 Bad Request error. I started looking around what I could have done wrong but I couldn’t find any mistake in my code(at least not one that could explain this error).

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A search on the Internet brought some insights, the error is probably related to a corrupt website cookie. So I deleted all my cookies and indeed the problem disappeared.

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