 
     /// Loads an image for the given request.
     ///
-    /// See [Nuke Docs](https://kean.blog/nuke/guides/image-pipeline-guide) to learn more.
+    /// See [Nuke Docs](https://kean.blog/nuke/guides/image-pipeline) to learn more.
     ///
+    /// - parameter request: An image request.
     /// - parameter queue: A queue on which to execute `progress` and `completion`
     /// callbacks. By default, the pipeline uses `.main` queue.
     /// - parameter progress: A closure to be called periodically on the main thread

        (self as SendEventProtocol)._send(event, task)
    }

    @available(*, deprecated, message: "Please use ImagePipelineDelegate")
    func _send(_ event: ImageTaskEvent, _ task: ImageTask) {
        observer?.pipeline(self, imageTask: task, didReceiveEvent: event)

        self.init(configuration: configuration, delegate: delegate)
    }

    /// Invalidates the pipeline and cancels all outstanding tasks. No new
    /// requests can be started.
    func invalidate() {
        queue.async {
            guard !self.isInvalidated else { return }
