fix

index.js

@@ -367,14 +367,7 @@ RedirectableRequest.prototype._processResponse = function (response) {
 
     // If the redirect is relative, carry over the host of the last request from host header
     var previousHostUrl = !url.parse(location).host ?
-      url.format({
-        protocol: currentUrlParts.protocol,
-        auth: currentUrlParts.auth,
-        host: previousHost,
-        pathname: currentUrlParts.pathname,
-        search: currentUrlParts.search,
-        hash: currentUrlParts.hash,
-      }) :
+      url.format(Object.assign({}, currentUrlParts, { host: previousHost })) :
       this._currentUrl;
 
     // Create the redirected request