What does 400 mean in HTTP Error Codes?

This page is about the meanings of the acronym/abbreviation/shorthand 400 in the Internet field in general and in the HTTP Error Codes terminology in particular.

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What does 400 mean?

four hundred, 400, cd(adj)
being one hundred more than three hundred

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"400." Abbreviations.com. STANDS4 LLC, 2016. Web. 28 Aug. 2016. <http://www.abbreviations.com/term/47395>.