title: How to post a Json object in a VS WebTest?
body: <p>I'm writing some webtests in Visual Studio 2015 Enterprise to do a load test on my API.</p>
  
  <p>Several of my API calls expect a Json object as the body of the request.  But the webtest interface doesn't appear to have any way to set the body of the Post request directly; you can add keys and values, but you can't set the request, either to an object that would implicitly be serialized, or even just a plain string.</p>
  
  <p>So how do you post Json in a web test?</p>