authority http header - in chrome dev tools : <p>chrome dev tools - displays some http header with a leading <code>:</code> (not sure why it does with some and not others).  </p>

<p>One of these is the http header <code>authority</code> which is displays as:</p>

<p><code>authority:api.somedomain.com</code></p>

<p>However this is listed in the list of http headers on Wikipedia. Is this a new HTTP2 header or is possible to define any new request field in the headers -or are these fixed?</p>
