Note you'll probably need to add something like below or NPN won't work.

You can test this by running your curl against https://twitter.com and viewing the `OkHttp-Selected-Protocol`.  If it is working, then you will see `HTTP-draft-09/2.0` or `spdy/3.1` instead of `http/1.1`.

```
<configuration>
    <flags>--Xbootclasspath/p:${reference to the current file}</flags>
``

@brianm ^^ likely to work?