问题
Is it possible for a valid URL to contain non-escaped Unicode characters?
回答1:
Yes, the subset of ASCII (and therefore Unicode) that is allowed unescaped in URIs, such as letters and numbers. But the majority of the Unicode character set has to be percent-encoded.
回答2:
URI and URL do not natively support unescaped non-ASCII Unicode characters, however many servers do allow percent-encoded UTF-8 or localized Ansi octets to be used (but no way of specifying which is actually used). For standardized native Unicode handling, use IRI instead, which is the new protocol that replaces URI/URL. It requires UTF-8 encoding for everything, and provides rules for how to convert between IRI and URI.
来源：https://stackoverflow.com/questions/6871404/can-a-path-in-a-uri-contain-unicode