title: Http handler in asp.net core
body: <p>Now i have asp mvc 5 .net framework  project and handlers (ashx files with custom logic) to process customer needs (i.e. pricelists in custom format). </p>
  
  <p>I intend to move to asp core, and the question : <strong>is there an equivalent to handler?</strong>
  Articles on internet suggest to put logic to middleware, but this is inconvenient way in my case.</p>