2012/2/12 Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp>:
Valdis.Kletnieks@vt.edu wrote: [snip] So, I can understand your attempt to insist on lowercase, but it does not work because DNS does not allow it. [snip]
Not exactly... DNS is case-insensitive when you are talking about 7-bit ASCII; the set of alphabetic characters that can appear in a DNS label; with no punycode. IDN means that non-ASCII characters are represented using punycode. As soon as you have a browser parsing punycode stuff, any string containing unicode characters has a unique punycode encoding / RFC 3491 / RFC 3492. The symbols represented in the punycode encodings are not case sensitive. Uppercase A-Z vs Lowercase a-z in the generalized variable-length integers are not distinct, the punycode representation itself cannot really be case sensitive, but the codepoint represented by the encoding, the result of decoding the punycode is case-preserving. -- -JH