Any way to invoke code from VCL after a request has been serviced?

Dridi Boukelmoune dridi at
Tue May 9 12:17:10 CEST 2017

> I'm looking into writing a module that enables Varnish for distributed
> tracing using the OpenTracing project []. This requires
> invoking code at the beginning of a request to start a span and insert
> tracing context into the request's headers and invoking code after a
> request's been processed to finish the span and measure how long it
> took to process.

You can see this kind of tracing in action in the Zipnish [1] project.
It's Varnish's equivalent to Zipkin and if I'm not wrong was or is
compatible with the latter.



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