header      http.Header
	nodeName    types.NodeName
	updates     chan<- interface{}
	data        []byte
	failureLogs int
	client      *http.Client
}

// NewSourceURL specifies the URL where to read the Pod configuration from, then watches it for changes.
func NewSourceURL(url string, header http.Header, nodeName types.NodeName, period time.Duration, updates chan<- interface{}) {
	config := &sourceURL{
		url:      url,
		header:   header,