you need to enable a probe in the backend for this to work i believe.
On Mon, Mar 7, 2011 at 3:58 PM, Drew Smathers <[email protected]>wrote: > Hi all, > > I'm trying to grace as a means of ensuring that cached content is > delivered from varnish past it's TTL if backends can't generate a > response. With some experiments this does not seem to happen with our > setup. After an object is cached, varnish still returns a 503 within > the grace period if a backend goes down. Below are details. > > version: varnish-2.1.4 SVN 5447M > > I stripped down my VCL to the following to demonstrate: > > backend webapp { > .host = "127.0.0.1"; > .port = "8000"; > } > > sub vcl_recv { > set req.backend = webapp; > set req.grace = 1h; > } > > > sub vcl_fetch { > set beresp.grace = 24h; > } > > Running varnish: > > varnishd -f simple.vcl -s malloc,1G -T 127.0.0.1:2000 -a 0.0.0.0:8080 > > > First request: > > GET /some/path/ HTTP/1.1 > Accept-Language: en > > HTTP/1.1 200 OK > Server: WSGIServer/0.1 Python/2.6.6 > Vary: Authorization, Accept-Language, X-Gttv-Apikey > Etag: "e9c12380818a05ed40ae7df4dad67751" > Content-Type: application/json; charset=utf-8 > Content-Language: en > Cache-Control: max-age=30 > Content-Length: 425 > Date: Mon, 07 Mar 2011 16:12:56 GMT > X-Varnish: 377135316 377135314 > Age: 6 > Via: 1.1 varnish > Connection: close > > > Wait 30 seconds, kill backend app, then make another request through > varnish: > > GET /some/path/ HTTP/1.1 > Accept-Language: en > > HTTP/1.1 503 Service Unavailable > Server: Varnish > Retry-After: 0 > Content-Type: text/html; charset=utf-8 > Content-Length: 418 > Date: Mon, 07 Mar 2011 16:14:02 GMT > X-Varnish: 377135317 > Age: 0 > Via: 1.1 varnish > Connection: close > > Any help or clarification on request grace would be appreciated. > > Thanks, > -Drew > > _______________________________________________ > varnish-misc mailing list > [email protected] > http://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc >
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