Hi Rainer,
On 06/09/2015 02:53 PM, Rainer Canavan wrote:
Remove etags (Header unset Etag/FileETag None)
Won't this disable conditional requests, ex. If-None-Match and friends? Is
your recomendation because of the header overhead or am I missing something?
Just if-None-Match. If-Modified-Since would still work. I believe
people recommend disabling ETags because they may cause problems with
clusters (i.e. different inode numbers or modification times for
otherwise identical files), or gzip content encoding
(https://bz.apache.org/bugzilla/show_bug.cgi?id=45023).
Well, if it's a static file i think the etag calculation should be quite
fast, after all in the default apache setting it's computed using thre
values:
FileETag INode MTime Size
which at least on linux should be cached in the dentry / filesystem cache.
So intuitively should be less work then reading this values, the file
content and sending it.
It's not that i've done measurements on this though, just speculation.
As for the cluster case (and for security reasons), i've been using:
FileETag MTime Size
Out of curiosity, does somebody have real misurements?
rainer
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