varnish.vcl
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varnish.vcl
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	/*
	* Sample Varnish configuration for EventLogging
	* ---------------------------------------------
	* This configuration specifies that requests for /event.gif?... be
	* handled by returning an empty response specifying HTTP 204 status
	* code ("No Content"). Varnish will still log the request in its shm
	* log, so it will be possible to consume the incoming event stream
	* using varnishncsa.
	*
	* This setup is currently deployed at the Wikimedia Foundation and
	* has been found to work well.
	*
	* Sample varnishncsa invocation:
	* varnishncsa -m RxURL:^/event\.gif\?. -F "%q %l %t %h"
	*
	* See the varnishncsa(1) man page for details.
	*
	*/
	sub vcl_recv {
	if (req.url ~ "^/event\.gif") {
	error 204;
	}
	}

	sub vcl_error {
	/* 204 responses shouldn't contain a body */
	if (obj.status == 204) {
	return(deliver);
	}
	}