text: // Copyright 2019 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #ifndef CONTENT_BROWSER_LOADER_CACHED_NAVIGATION_URL_LOADER_H_
  #define CONTENT_BROWSER_LOADER_CACHED_NAVIGATION_URL_LOADER_H_
  
  #include "content/browser/loader/navigation_url_loader.h"
  
  namespace content {
  
  // NavigationURLLoader for navigations that activate a back-forward cached or
  // prerendered page. Unlike a normal navigation, no actual URL loading occurs.
  // This is because loading already happened the first time this URL was
  // navigated to (before it was added to the back-forward cache or when it was
  // prerendered).
  class CachedNavigationURLLoader : public NavigationURLLoader {
   public:
    CachedNavigationURLLoader(
        LoaderType loader_type,
        std::unique_ptr<NavigationRequestInfo> request_info,
        NavigationURLLoaderDelegate* delegate,
        network::mojom::URLResponseHeadPtr cached_response_head);
    ~CachedNavigationURLLoader() override;
  
    static std::unique_ptr<NavigationURLLoader> Create(
        LoaderType loader_type,
        std::unique_ptr<NavigationRequestInfo> request_info,
        NavigationURLLoaderDelegate* delegate,
        network::mojom::URLResponseHeadPtr cached_response_head);
  
    // NavigationURLLoader implementation.
    void Start() override;
    void FollowRedirect(
        const std::vector<std::string>& removed_headers,
        const net::HttpRequestHeaders& modified_headers,
        const net::HttpRequestHeaders& modified_cors_exempt_headers,
        blink::PreviewsState new_previews_state) override;
    bool SetNavigationTimeout(base::TimeDelta timeout) override;
  
   private:
    void OnResponseStarted();
  
    const LoaderType loader_type_;
    std::unique_ptr<NavigationRequestInfo> request_info_;
    NavigationURLLoaderDelegate* delegate_;
    network::mojom::URLResponseHeadPtr cached_response_head_;
    base::WeakPtrFactory<CachedNavigationURLLoader> weak_factory_{this};
  };
  
  }  // namespace content
  
  #endif  // CONTENT_BROWSER_LOADER_CACHED_NAVIGATION_URL_LOADER_H_
  