资 源 简 介
URI Normalization function:
* Take care of IDN domains.
* Always provide the URI scheme in lowercase characters.
* Always provide the host, if any, in lowercase characters.
* Only perform percent-encoding where it is essential.
* Always use uppercase A-through-F characters when percent-encoding.
* Prevent dot-segments appearing in non-relative URI paths.
* For schemes that define a default authority, use an empty authority if the default is desired.
* For schemes that define an empty path to be equivalent to a path of "/", use "/".
* For schemes that define a port, use an empty port if the default is desired
* All portions of the URI must be utf-8 encoded NFC from Unicode strings
Inspired by Sam Ruby"s urlnorm.py: http://intertwingly.net/blog/2004/08/04/Urlnorm
History:
* 10 Feb 2010: support for shebang (#!) urls
* 28 Feb 2010: using "http" schema by default when appropriate
* 28 Feb 2010: added handling of IDN domains
* 28 Feb 2010: code pep8-za
