// Watch attempts to begin watching the requested location.
// Returns a watch.Interface, or an error.
func (r *Request) Watch() (watch.Interface, error) {
	if r.err != nil {
		return nil, r.err
	}
	req, err := http.NewRequest(r.verb, r.finalURL(), r.body)
	if err != nil {
		return nil, err
	}
	client := r.client
	if client == nil {
		client = http.DefaultClient
	}
	resp, err := client.Do(req)
	if err != nil {
		if isProbableEOF(err) {
			return watch.NewEmptyWatch(), nil
		}
		return nil, err
	}
	if resp.StatusCode != http.StatusOK {
		var body []byte
		if resp.Body != nil {
			body, _ = ioutil.ReadAll(resp.Body)
		}
		return nil, fmt.Errorf("for request '%+v', got status: %v\nbody: %v", req.URL, resp.StatusCode, string(body))
	}
	return watch.NewStreamWatcher(watchjson.NewDecoder(resp.Body, r.codec)), nil
}
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// Watch attempts to begin watching the requested location.
// Returns a watch.Interface, or an error.
func (r *Request) Watch() (watch.Interface, error) {
	if r.err != nil {
		return nil, r.err
	}
	url := r.URL().String()
	req, err := http.NewRequest(r.verb, url, r.body)
	if err != nil {
		return nil, err
	}
	client := r.client
	if client == nil {
		client = http.DefaultClient
	}
	resp, err := client.Do(req)
	if err != nil {
		// The watch stream mechanism handles many common partial data errors, so closed
		// connections can be retried in many cases.
		if util.IsProbableEOF(err) {
			return watch.NewEmptyWatch(), nil
		}
		return nil, err
	}
	if resp.StatusCode != http.StatusOK {
		if result := r.transformResponse(resp, req); result.err != nil {
			return nil, result.err
		}
		return nil, fmt.Errorf("for request '%+v', got status: %v", url, resp.StatusCode)
	}
	return watch.NewStreamWatcher(watchjson.NewDecoder(resp.Body, r.codec)), nil
}