3.2.3 URI Comparison

When comparing two URIs to decide if they match or not, a client SHOULD use a case-sensitive octet-by-octet comparison of the entire URIs, with these exceptions:

- A port that is empty or not given is equivalent to the default port for that URI-reference; - Comparisons of host names MUST be case-insensitive;

- Comparisons of scheme names MUST be case-insensitive.

- An empty abs_path is equivalent to an abs_path of "/".

Characters other than those in the "reserved" and "unsafe" sets (seeRFC 2396 [42]) are equivalent to their ""%" HEX HEX" encoding.

For example, the following three URIs are equivalent: