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<div>Thanks Raymond.</div>
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<div>If we don't hear any views to the contrary from Varnish themselves, we'll go with the standard approach of using obj.hits</div>
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<div>Regards,</div>
<div>Umesh</div>
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<span style="font-weight:bold">From: </span>"<Jennings III>", Raymond <<a href="mailto:raymond.jennings@nytimes.com">raymond.jennings@nytimes.com</a>><br>
<span style="font-weight:bold">Date: </span>Thursday, 2 April 2015 13:38<br>
<span style="font-weight:bold">To: </span>Umesh Telang <<a href="mailto:Umesh.Telang@bbc.co.uk">Umesh.Telang@bbc.co.uk</a>><br>
<span style="font-weight:bold">Cc: </span>"<a href="mailto:varnish-misc@varnish-cache.org">varnish-misc@varnish-cache.org</a>" <<a href="mailto:varnish-misc@varnish-cache.org">varnish-misc@varnish-cache.org</a>><br>
<span style="font-weight:bold">Subject: </span>Re: Determining a HIT or a MISS in Varnish 4 VCL<br>
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<div dir="ltr">I think that's the way - exactly as you have in vcl_deliver. I've always used that in V3 and now in V4 as well.
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<div>I'm suspect of that page telling you to not use obj in vcl_deliver but use that header value instead.</div>
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<div style="color:rgb(0,0,0)"><font face="Helvetica"><span style="font-size:12px">Raymond Jennings III</span></font></div>
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<div>FaceTime:<span style="font-weight:normal"> <a href="mailto:Raymond.Jennings@nytimes.com" style="color:rgb(17,85,204)" target="_blank">Raymond.Jennings@nytimes.com</a></span></div>
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<div class="gmail_quote">On Thu, Apr 2, 2015 at 8:28 AM, Umesh Telang <span dir="ltr">
<<a href="mailto:Umesh.Telang@bbc.co.uk" target="_blank">Umesh.Telang@bbc.co.uk</a>></span> wrote:<br>
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<div style="font-size:14px;font-family:Calibri,sans-serif">Hello,</div>
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<div style="font-size:14px;font-family:Calibri,sans-serif">It's unclear if the way to detect whether a particular response was the result of a cache hit or miss in VCL, has changed from Varnish 3 to Varnish 4.</div>
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<div style="font-size:14px;font-family:Calibri,sans-serif">At this page (not an official Varnish page...), it suggests using the value of <span>resp</span><span>.</span><span>http</span><span>.</span><span>X</span><span>-</span><span>Varnish (whether it has
a single or multiple values) to determine this:</span></div>
<div style="font-size:14px;font-family:Calibri,sans-serif"><span><a href="http://foshttpcache.readthedocs.org/en/latest/varnish-configuration.html" target="_blank">http://foshttpcache.readthedocs.org/en/latest/varnish-configuration.html</a>#</span></div>
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<div style="font-size:14px;font-family:Calibri,sans-serif"><span>Alternatively I've also seen suggestions for continuing to use obj.hits in vcl_deliver. e.g. :</span></div>
<div><span style="font-size:10px"><font face="Consolas">sub vcl_deliver { </font></span></div>
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<td><span style="font-size:10px">if (obj.hits > 0) { # Add debug header to see if it's a HIT/MISS and the number of hits, disable when not needed</span></td>
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<td><span style="font-size:10px">set resp.http.X-Cache = "HIT";</span></td>
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<td><span style="font-size:10px">} else {</span></td>
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<td><span style="font-size:10px">set resp.http.X-Cache = "MISS";</span></td>
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<td><span style="font-size:10px">}</span></td>
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</font></span></div>
<div><span style="font-size:10px"><font face="Consolas">}</font></span></div>
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<div style="font-size:14px;font-family:Calibri,sans-serif"><span>We've observed that the value of %{</span>Varnish:handling}x in the varnish ncsa log has been accurate in reporting HITs vs MISSes. Could we use a VCL equivalent of this in vcl_deliver to determine
whether a particular response is the result of a HIT or a MISS?</div>
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<div style="font-size:14px;font-family:Calibri,sans-serif">Any advice on the recommended way in VCL to determine whether a response is the result of a HIT or MISS would be greatly appreciated!</div>
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<div style="font-size:14px;font-family:Calibri,sans-serif">Thanks,</div>
<div style="font-size:14px;font-family:Calibri,sans-serif">Umesh</div>
<pre style="font-size:14px;font-family:Calibri,sans-serif"><span></span><span></span></pre>
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