fix error

lib/roda/proxy.rb

@@ -86,24 +86,18 @@ class Roda
                .join('-')
             end
             .merge({ 
-                     'Host' => "localhost",
-                     'Via' => _via_header_string
+                     'Host' => "127.0.0.1"
                    })
         end
         
         def _respond(proxied_response)
-          response.status = proxied_response.status
+          response.status = proxied_response.code.to_i
           proxied_response
-            .headers
+            .each_header.to_h
             .reject { |k, v| k.downcase == 'transfer-encoding' } 
             .each { |k, v| response[k] = v }
-          response['Via'] = _via_header_string
           response.write(proxied_response.body)
         end
-        
-        def _via_header_string
-          "#{env['SERVER_PROTOCOL']} #{env['SERVER_NAME']}:#{env['SERVER_PORT']}"
-        end
       end
     end