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Url Encoding, Escape encoding or percent encoding, why is it?

Despite the great popularity of the Internet, historically, that the address line format (Url format) supports only a limited set of ANSI characters, originally defined in RFC 1738 specification, and today it is a very serious lack of standard Url.
Url Encoding consists of two steps: first, the character that is not in a valid set, it takes the hexadecimal (HEX) code. If the length exceeds 2 bytes, then the resulting value is divided by 2 (1 byte), and finally, each sign of the resulting value is attributed to % percent.

For sample: Ü → C3 и 9C(C39C) → %C3%9C

A set of characters allowed in a URL format and does not require a percentage (Url) coding:

  • all uppercase and lowercase English letters: A-Z a-z
  • arabic numerals: 0-9
  • an additional limited set of symbols and punctuation marks: - _ . ~
  • ? and & are allowed in the parameters

The basic principle of the Url encoder

It's pretty simple: approved standard symbols remain unchanged, while the characters are not included in the specification are subjected to coding. Decoding Url reproduces encoding mechanism, only in reverse: Escape conversion replaces the address bar, and leads to sight-read.

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