[Tip] ISO-8859-1 and unicode

ISO-8859-1은 HTML 4.01의 기본 인코딩 문자이다. 이는 ASCII 문자열을 포함하고 있다. 마지막 숫자의 의미는 커버할 수 있는 문자열을 의미한다. 자세한 사항은 아래와 같다.

ISO-8859-1 is the default character in HTML 4.0.1. It contains numbers, upper and lowercase English letters, and some special characters like ASCII printable characters. The last number means languages. Details are like this : 

Character set	Description	Covers
ISO-8859-1	Latin alphabet part 1	North America, Western Europe, Latin America, the Caribbean, Canada, Africa
ISO-8859-2	Latin alphabet part 2	Eastern Europe
ISO-8859-3	Latin alphabet part 3	SE Europe, Esperanto, miscellaneous others
ISO-8859-4	Latin alphabet part 4	Scandinavia/Baltics (and others not in ISO-8859-1)
ISO-8859-5	Latin/Cyrillic part 5	The languages that are using a Cyrillic alphabet such as Bulgarian, Belarusian, Russian and Macedonian
ISO-8859-6	Latin/Arabic part 6	The languages that are using the Arabic alphabet
ISO-8859-7	Latin/Greek part 7	The modern Greek language as well as mathematical symbols derived from the Greek
ISO-8859-8	Latin/Hebrew part 8	The languages that are using the Hebrew alphabet
ISO-8859-9	Latin 5 part 9	The Turkish language. Same as ISO-8859-1 except Turkish characters replace Icelandic ones
ISO-8859-10	Latin 6 Lappish, Nordic, Eskimo	The Nordic languages
ISO-8859-15	Latin 9 (aka Latin 0)	Similar to ISO-8859-1 but replaces some less common symbols with the euro sign and some other missing characters
ISO-2022-JP	Latin/Japanese part 1	The Japanese language
ISO-2022-JP-2	Latin/Japanese part 2	The Japanese language
ISO-2022-KR	Latin/Korean part 1	The Korean language

서유럽 문자인 ISO-8859-1이 HTML 표준 인코딩셋이기 때문에, http 통신을 할 때 request에 들어있는 한글 파라미터는 당연히 깨진다. 따라서 UTF-8 유니코드 인코딩셋으로 변환해줘야 한다.  이때 유니코드는 위의 ASCII의 문제점이 있기 때문에 나온 방식이다. 전 세계의 모든 문자열을 인코딩하기 위해 만들어졌다.

So, a korean parameter cannot be transfer well from request object while interchaging HTTP. For this reason, you have to transfer it to unicode encoding. Unicode is a computing industry standard for the consistent encoding, representation, and handling of text expressed in most of the world's writing systems.