HeyJaredSeth Michael Larson
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- Aug 26, 2026
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- Aug 26, 2026
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When str.lower() is a security vulnerability in Python (opens the original)
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Some internet standards only support ASCII characters, but the world uses much more than the Latin alphabet. Thus, a mapping from Unicode to ASCII for use in domain names is required. NamePrep was part of that solution, defined in RFC 3491 as a profile of StringPrep, and is crucially a component of Internationalizing Domain Names in Applications (IDNA), also known as “IDNA 2003”. The StringPrep algorithm is defined in RFC 3454. IDNA 2003 has been obsoleted by IDNA 2008 defined in RFC 5890, 5891,
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