The most current version of the help states under 5.6:
Notes:
1.The ! is the escape character to generate special
characters in the URL. The ! must be followed by
the hex code of corresponding ASCII code of the
special character (exactly two digits). E.g. if
your password contains a @ you have to insert !40
at that place instead.
2.The % can be used alternatively for the !.
3.The + character represents a blank in the URL
specification. If you have to insert a literal +,
you have to use the escape sequence %2b.
The above is true at least for the current 'beta'.
Hardy
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