Percent encoding, URL encoding

Mechanism for encoding information in a Uniform Resource Identifier (URI). Every "unsafe" character is represented in the form %HH or with a longer escape sequence (where H is as hexadecimal digit '0' ... 'F').

Actually, every reserved or non-ASCII (including UCS-2 or UCS-4) character

• first, is transformed into a sequence of octets using the UTF-8 or another external format transformation;
• then, the resulting sequence of octets is transformed into a string with each octet represented by an escape sequence of the form %HH.

See also

• Percent encoding in Wikipedia