Function formEncode
Returns the form encoded version of a given string.
T[] formEncode(T)
(
T[] str,
const(char)[] allowed_chars = null
)
if (is(T[] : const(char)[]));
Form encoding is the same as normal URL encoding, except that spaces are replaced by plus characters.
Note that newlines should always be represented as \r\n sequences according to the HTTP standard.