title: .NET Core 2.0 Web API - How to add a custom header parameter in Swagger
body: <p>As per the title - I've found examples of how to do this using regular .NET</p>
  
  <p>E.g:
  <a href="https://stackoverflow.com/questions/41493130/web-api-how-to-add-a-header-parameter-for-all-api-in-swagger">Web Api How to add a Header parameter for all API in Swagger</a></p>
  
  <p>However, I can't find any examples, or documentation, showing how to accomplish the same thing when using .NET Core 2.0.</p>