title: How to send complete POST request using Net::HTTP (Rails)
body: <p>I want to send a complete request like this:</p>
  
  <pre><code>POST /2012-09-25/jobs HTTP/1.1
  Content-Type: application/json; charset=UTF-8
  Accept: */*
  Host: elastictranscoder.amazonaws.com:443
  x-amz-date: Mon, 14 Jan 2013 17:49:52 GMT
  Authorization: AWS4-HMAC-SHA256 
             Credential=AccessKeyID/request-date/Elastic Transcoder endpoint/ets/aws4_request,
             SignedHeaders=host;x-amz-date;x-amz-target,
             Signature=calculated-signature
  Content-Length: number of characters in the JSON string
  {
  "Input":{
    "Key":"AAAA",
    "FrameRate":"auto",
    "Resolution":"auto",
    "AspectRatio":"auto",
    "Interlaced":"auto",
    "Container":"auto"
  },
  "Output":{
    "Key":"BBBB",
    "ThumbnailPattern":"pattern",
    "Rotate":"auto",
    "PresetId":"12345"
  },
  "PipelineId":"987654"
  }
  </code></pre>
  
  <p>How to make it with <code>Net::HTTP</code> in Rails?</p>