title: Can postman call some c# dll or custom routine before send request out?
body: <p>I am trying to create some postman test cases for an old web api.</p>
  <p>What I realized is that the web api expects binary content in the HttpRequest body other than a Json message. We have a c# client, which does this before sending request:</p>
  <pre><code>var body = new ByteArrayContent( SerializeToByteArray(info));
      
  using ( var result = await Client.Post&lt;HttpResponseMessage&gt;( options , body , Configuration , ct ).ConfigureAwait( false ) )
            
  </code></pre>
  <p>In postman, can I call a routine(either existing function or some custom dll) to convert body to byte array before sending the request out?</p>