caching - How banning in Varnish works? -


I do not understand how it works in varnish. Period of difference between purity and restriction and thinking seems to be that

  • purifies the cache invalid and the next request goes back to the backend and is cached again
  • Ban, banned a URL such that it invalidates the cache and not just the next, but all incoming requests go back to the backend.

    Please clarify.

    Additionally, each object in the cache always prohibits the algo

    indicates an entry on the restriction list, this is the entry that they last checked against it. Had done it. Whenever the varnish receives something from the cache, it checks that the object pointer in the ban list indicates at the top of the list. If it does not point to the top of the list, then it will check the object against all the new entries on the ban list, and if the object does not match them, then update the indicator of the restriction list.

    If anyone gets this ... it will be very helpful.

    Restrictions and purifying are both ways to make the content invalid.

    Requires proofing that you can identify a URL that you want to invalidate, and send an HTTP PURGE request for this URL.

    The restriction is more configurable, and you are allowed to set several AND-ed expressions (any stored headers) do not need to match for the cash object. The next client is requested on the request, or the cash which periodically scans through an internal job (restriction) can be added through the restriction HTTP or VRD console.

    This is always a stop invalid if a HTTP object has been invalidated by the restriction, then it will not be matched with that restriction, when it will later return to the cache.

    Some misleading uses of the word "ban" are prohibited because candidates are not eligible for matching item delivery when viewed in any cache. In varnish there can be multiple versions of a hash key in the cache (== Hostname + URI), and it is necessary to decide who will serve on each request.

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