问题
Is a UUID URL safe? I want to use it as an alternate ID yet perhaps allowing access to the record as the ID in the URL. While I can use Ruby’s SecureRandom.urlsafe_base64(27) to obtain a random base64-encoded string of the same length, a UUID looks cleaner.
回答1:
Yes.
A UUID consists of only hexadecimal characters (a–f, 0–9) plus a hyphen (-).
As per RFC 3986 (URI Syntax) §2.3, hyphen and hexadecimal characters are included in those explicitly unreserved:
Characters that are allowed in a URI but do not have a reserved purpose are called unreserved. These include uppercase and lowercase letters, decimal digits, hyphen, period, underscore, and tilde.
来源：https://stackoverflow.com/questions/23146193/is-a-uuid-url-safe