net.urllib: keep the query parameter order (#13405)

vlib/net/http/request.v

@@ -230,6 +230,11 @@ fn parse_request_line(s string) ?(Method, urllib.URL, Version) {
 }
 
 // Parse URL encoded key=value&key=value forms
+//
+// FIXME: Some servers can require the
+// parameter in a specific order.
+//
+// a possible solution is to use the a list of QueryValue
 pub fn parse_form(body string) map[string]string {
 	words := body.split('&')
 	mut form := map[string]string{}