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Reverse proxy cache ESI support

Reverse proxy cache ESI support

Sept 24, 2009

 

Varnish

Squid

 

Varnish

Squid

Compiled in by default

Supports variables

Passes cookies to ESI includes

ESI enabling

In vcl file

In HTTP response headers

Relative URLs for includes

Varnish

  • Output using ESI seems mangled when rendered with Gecko-based browsers.

Squid

  • ESI includes may crash Squid (tested 3.0STABLE15) if they have non-absolute URLs:

    starting new ESI subrequest failed

    • Canceling a request with a failed ESI include results in:

      FATAL: Received Segment Violation...dying.

    • A segment violation error on relative URL include can be avoided with onerror="continue" in the ESI include tag.

    • ESI with relative URLs should work according to the spec:

  • ESI logs appear in /var/log/squid/cache.log