我想要发送一个完整的请求，就像这样：
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"
}
如何在Rails中使用Net::HTTP？