Swap out for deprecated hostname

Author: connor4312

lib/parsers.js

@@ -78,10 +78,10 @@ module.exports.parseRequest = function parseRequest(req, kwargs) {
     // host:
     //
     //   node: req.headers.host
-    //   express: req.host
+    //   express: req.hostname
     //   koa: req.host
     //
-    var host = req.host || headers.host || '<no host>';
+    var host = req.hostname || headers.host || '<no host>';
 
     // protocol:
     //