title: Optional Parameters into a POST request in .NET?
body: <p>say that I have a WebApi working over POST and that Api can have 3 parameters</p>
  
  <p>api/login</p>
  
  <p>parameters
  -user
  -password
  -logo(optional)</p>
  
  <p>when I call this api , can I just skip the logo param ?</p>
  
  <p>what is the real meaning to have a optional parameter into a POST type ?
  there are mandatory ?</p>