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401

“Unauthorized” HTTP status code.

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WebGlossary.info is based on The Web Development Glossary 3K, version 1.1.217 from February 2025 (current book version: 1.2.9; upcoming: 1.2.13). Site last updated on May 8, 2026. All explanations licensed under CC BY–SA 4.0. (Report an issue or make a suggestion?)

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