mh-url-hexify-string

mh-url-hexify-string is an alias for `url-hexify-string' in `mh-compat.el'.

(mh-url-hexify-string STRING &optional ALLOWED-CHARS)

URI-encode STRING and return the result.
If STRING is multibyte, it is first converted to a utf-8 byte
string. Each byte corresponding to an allowed character is left
as-is, while all other bytes are converted to a three-character
string: "%" followed by two upper-case hex digits.

The allowed characters are specified by ALLOWED-CHARS. If this
argument is nil, the list `url-unreserved-chars' determines the
allowed characters. Otherwise, ALLOWED-CHARS should be a vector
whose Nth element is non-nil if character N is allowed.