url.parse is an expensive function, so making sure to use it once for multiple middleware

we will add this to other middleware too like the mod_statuspage etc.

@evantorrie  -  can you check it too.
You could also do this:

```js
req.fullpath = req.fullpath || url.parse(req.url).pathname;
if (req.fullpath === config.url) {
```

Then we don't have to drag the object around, only a string. (the name `fullpath` doesn't really matter as long as it doesn't stomp on other things.