// Timeout specifies a time limit for requests made by this
        // Client. The timeout includes connection time, any
        // redirects, and reading the response body. The timer remains
        // running after Get, Head, Post, or Do return and will
        // interrupt reading of the Response.Body.
        //
        // A Timeout of zero means no timeout.
        //
        // The Client cancels requests to the underlying Transport
        // using the Request.Cancel mechanism. Requests passed
        // to Client.Do may still set Request.Cancel; both will
        // cancel the request.
        //
        // For compatibility, the Client will also use the deprecated
        // CancelRequest method on Transport if found. New
        // RoundTripper implementations should use Request.Cancel
        // instead of implementing CancelRequest.
        Timeout time.Duration