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Varnish configuration to ensure routing works

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Original file line number	Diff line number	Diff line change
`@@ -176,5 +176,23 @@ that will invalidate the cache for a given resource:`
`176`	`176`	`}`
`177`	`177`	`}`
`178`	`178`
	`179`	`+Routing`
	`180`	`+------------------`
	`181`	+To ensure Symfony Router generates urls correctly with Varnish, proper ```X-Forwarded``` headers must be added. Headers depend on how you have configured hosts and ports for the web server and Varnish but this example should work if the web server is using the same IP as Varnish but different port (e.g. 8080).
	`182`	`+`
	`183`	`+..code-block::text`
	`184`	`+`
	`185`	`+sub vcl_recv {`
	`186`	`+ if (req.http.X-Forwarded-Proto == "https" ) {`
	`187`	`+ set req.http.X-Forwarded-Port = "443";`
	`188`	`+ } else {`
	`189`	`+ set req.http.X-Forwarded-Port = "80";`
	`190`	`+ }`
	`191`	`+ }`
	`192`	`+`
	`193`	`+..note::`
	`194`	`+`
	`195`	`+Remember to set framework.trust_proxy_headers: true for this to work.`
	`196`	`+`
`179`	`197`	.. _`Edge Architecture`:http://www.w3.org/TR/edge-arch
`180`	`198`	.. _`GZIP and Varnish`:https://www.varnish-cache.org/docs/3.0/phk/gzip.html

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