Hi, 1. I want a state-while-revalidate feature(available in some reverse proxies like squid) for my varnish server. In a normal setting with the grace time, the varnish
makes the first client to wait while the other clients are served stale content. But I want all clients to be served stale content, while the refereshing of the cache is done at the background asychronously (that way no one is kept at waiting) by varnish. Varnish doesnt support this as of now.. Is there any tweak to achieve it ? 2. I am planning a tweak for the above functionality which is as follows, for the first request, the varnish normally sends the request it to backend where its reported as a cache miss and then the request is validated (i used varnishlog to see that it reports vcl_miss for the first request) .. whereas for the other queued requests, they are just treated as a normal cache hit and delivered immediately.. now, I want to stop the first request to wait for the validation, so I am planning to somehow find if the current request is a stale request and within the grace time, if so, I will serve the stale response for it quickly, and since I want to validate the cache at the backend asynchronously, I willl send this url to an asynchronous queue which will cache this request whenever free.. now my question is, how can I find if the request is the first object and is stale but within the grace time ? If I am able to find this, I can probably create a Stale-while-Validate for varnish.. Thanks Arun
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