encode_www_form_component(str)
Class Public methods
Encode given str to URL-encoded form data.
This method doesn't convert *, -, ., 0-9, A-Z, _, a-z, but does convert
SP (ASCII space) to + and converts others to %XX.
This is an implementation of www.w3.org/TR/html5/association-of-controls-and-forms.html#url-encoded-form-data
See ::decode_www_form_component,
::encode_www_form