title: Web Api How to add a Header parameter for all API in Swagger
body: <p>I searched for possible ways to add a request header parameter that would be added automatically to every method in my <code>web-api</code> but i couldn't find a clear one. </p>
  
  <p>While searching i found that the method <code>OperationFilter()</code> has to do something about it. </p>