Hello, I have a weird case of Varnish returning a hit with a Length of 0. It happens when I clear my browser cache and then hit refresh. Varnish returns a 304 status and my browser shows a blank white page. Here is a snippet of the varnishlog output:
10 RxHeader c If-Modified-Since: Mon, 08 Dec 2008 17:28:41 GMT 10 RxHeader c Cache-Control: max-age=0 10 VCL_call c recv 10 VCL_return c lookup 10 VCL_call c hash 10 VCL_return c hash 10 Hit c 1043648757 10 VCL_call c hit 10 VCL_return c deliver * 10 Length c 0* 10 VCL_call c deliver 10 VCL_return c deliver 10 TxProtocol c HTTP/1.1 10 TxStatus c 304 10 TxResponse c Not Modified 10 TxHeader c Date: Wed, 21 Jan 2009 15:16:20 GMT 10 TxHeader c Via: 1.1 varnish 10 TxHeader c X-Varnish: 1043648775 10 TxHeader c Last-Modified: Mon, 08 Dec 2008 17:28:41 GMT My default.vcl is pretty much the default, with a few minor changes that I copied from the wiki. (Normalizing Accept-Encoding and allowing purge on Shift-Refresh). I'm reading this as saying: 1. Browser asks varnish for a new copy, with a max age of 0 from Mon, 08 Dec 2008 17:28:41 GMT or newer. 2. vcl_recv decides to do a lookup. 3. It's found that the item exists in the cache (hit!) but that the file hasn't been modified since Mon, 08 Dec 2008 17:28:41 GMT. 4. vcl_deliver decides to send a 304 not modified instead of the actual response. I wonder why my browser is sending an If-Modified-Since header when it doesn't really have a copy? I've been running Varnish on a heavily used testing server for the past week and I get this from time to time in both Firefox and Safari but I can't reproduce it consistently. Anyone experience anything like this? -- Nathan <[email protected]>
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