content::NavigationURLLoader / NavigationURLLoaderImpl
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The source provides a highly technical explanation of the NavigationURLLoader system within the Chromium architecture, specifically focusing on its implementation, NavigationURLLoaderImpl. This component, which operates in the browser's UI thread, is central to managing the lifecycle of a main resource network request initiated during a page navigation. The text details how the loader is created by a NavigationRequest, uses a Mojo interface to communicate asynchronously with the separate Network Service, and employs systems like ThrottlingURLLoader and NavigationLoaderInterceptors to enforce security policies and handle specialized protocols (like Service Workers or downloads). Furthermore, the source examines critical stages, including building the network request, processing redirects, handling the final response (which involves checks for downloads, MIME sniffing, and policies like CSP and COOP), and passing the resulting data pipe off to the renderer process for page commitment.
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