[YouTube-API] Uploading from browser

Hello,

I'm trying to upload the metadata for the video, but I don't quite get
how to make the jquery ajax call.
Is this part of the code correct?

$.ajax({
url: "http://gdata.youtube.com/action/GetUploadToken",
type: "POST",
data: {
Authorization: AuthSub token="<authentication_token>",
X-GData-Key: key=<developer_key>,
Content-Length: <content_length>
},
dataType: "xml"
});

How do I know what the content_length is? And how do I sent the atom
xml entry with the actual video information I'm about to upload?

Thanks

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