title: How to get request headers using Owin Self Host Web API
body: <p>I have ported an existing web api project - which has been run using IIS - to OWIN (selfhosted). I´m using dependency injection (unity) and have implemented a service which needs some information from the current request´s header (i.e. <code>var x = HttpContext.Current.Request.Headers["xxx"]</code>).</p>
  
  <p>Since <code>HttpContext</code> is not available in OWIN (which makes sense) - how can I get the current request? Please keep in mind that I do need this information inside an injected service (not inside a controller and an OWIN middleware module - owincontext).</p>