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Low level method for sending HEAD requests to the S3 REST API.
- 'path' - the S3 Path.
- 'callback' - the callback that is executed when the processing finishes. It has a couple of arguments: error and result.
- If there's an error, the callback receives the error argument as Error instance.
- If the error argument is null, then the response argument contains the response.headers object as returned by the node.js core HTTPS client.