Fix charset validation for urlencoded

Author: Phillip9587

lib/types/urlencoded.js

@@ -35,13 +35,15 @@ function urlencoded (options) {
 
   var extended = Boolean(opts.extended)
   var type = opts.type || 'application/x-www-form-urlencoded'
-  var charset = opts.charset || 'utf-8'
 
   var queryparse = opts.parser || createQueryParser(opts, extended)
 
   return genericParser(opts, {
     type: type,
-    charset: charset,
+
+    charset: function validateCharset (charset) {
+      return charset === 'utf-8' || charset === 'iso-8859-1'
+    },
 
     parse: function parse (body, encoding) {
       return body.length