Create creates a new http request with the given host.

CreateRaw is same as 'Create' but will return raw bytes of the request (wire format) returned by 'Create'.

Extract verifies If the given request has the header 'X-APORETO-PING'.

ExtractRaw is same as 'Extract' but will parse the raw bytes of the request passed and calls 'Validate'.

PingHeaderKey holds the value for aporeto ping.