UTF8 hexadecimal string
URIComponent string such like "%67%68"
Note that these "0-9A-Za-z!'()*-._~
" characters will not
converted to "%xx" format by builtin 'encodeURIComponent()' function.
However this 'encodeURIComponentAll()' function will convert
all of characters into "%xx" format.
convert UTF8 hexadecimal string to a URLComponent string such like "%67%68".