Example doesn't seem to work.

Running node 6.7

Running tls or raw server aren't working when testing localhost:8080 in chrome.

raw triggers a download that just hangs.

tls returns an empty response 

```
localhost didn’t send any data.
ERR_EMPTY_RESPONSE
```

In both cases nothing is logged and the onRequest handler is not called.

Any tips?

```
node example/server
```

```
HTTP2_PLAIN=true node example/server.js
```
