Encodes form_data_set into a value of type "application/x-www-form-urlencoded", as defined in the HTML 4.01 spec.
Note that the HTML spec states that "The control names/values are listed in the order they appear in the document." Since this method takes a hash table, it cannot enforce that; if you care about the ordering of the form fields, use encode_datalist.
| form_data_set |
a hash table containing name/value pairs (as strings) |
|
the encoded form |