See:

• https://documentation.magnolia-cms.com/display/DOCS/Managing+pages
• https://www.ietf.org/rfc/rfc3986.txt

  Section 2, on characters, has been rewritten to explain what
  characters are reserved, when they are reserved, and why they are
  reserved, even when they are not used as delimiters by the generic
  syntax. The mark characters that are typically unsafe to decode,
  including the exclamation mark ("!"), asterisk ("*"), single-quote
  ("'"), and open and close parentheses ("(" and ")"), have been moved
  to the reserved set in order to clarify the distinction between
  reserved and unreserved and, hopefully, to answer the most common
  question of scheme designers. Likewise, the section on
  percent-encoded characters has been rewritten, and URI normalizers
  are now given license to decode any percent-encoded octets