javascript - How to load only the content area, skip header and footer loading again in new pages over clicking links -

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im using basecamp, , when click on menu links, loads inner body content alone, still url changes, wonder, ive examined in network tab, , see there each link click triggers request , gets body part, no headers/footer loading, amazed flow.

where in other sites(even in stackoverflow) loads page beginning, cache or other stuff loads there lil flicker if examine clearly.

do guys have idea how works, there frameworks helps way? because works extremely fast , no flicker @ in header menus, , specially while browsing in mobile gives feel using application(mobile app loads content)

please let me if have idea how flow works.

thanks in advance

here's full explanation of why fast:

  1. stacker: turbolinks/pjax technique instant page loads
  2. russian-doll caching: low-hassle, automated way aggressive caching

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