title: Mule: sending an input stream payload (from file) along with file metadata to http outbound endpoint
body: <p>I have an input stream payload with data from a file. The file can be very big. I'm sending the input stream to an http/https outbound endpoint. However, I'd like to also send metadata with the contents of the file, such as the file name and possibly other key/pair values in the post request.</p>
  
  <p>If I have an input stream, and also a few strings which I want to send as a single post data, what would I need to do with Mule on the payload in order to have them all sent properly?</p>