title: HTTPClient post from string
body: <p>I'm trying to integrate Zoho viewer:</p>
  
  <pre><code>clnt = HTTPClient.new
  @zoho_link = clnt.post('http://viewer.zoho.com/api/view.do', {:apikey =&gt; 'd4a361ce621000000000000', :file =&gt; File.new('/home/jon/Desktop/data.csv')})
  </code></pre>
  
  <p>I already have data in a variable and I want to pass it as a multipart post parameter. How can I make this work without creating a data.csv file?</p>
  
  <p>Thanks!</p>