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From James Smith <...@sanger.ac.uk>
Subject Re: [users@httpd] Apache24 - how to optimize httpd.conf
Date Tue, 09 Jun 2015 13:59:21 GMT
In many cases it will only be a few packets anyway so won't actually 
make that much difference!

The point is that it is better to stop the request in the first place by 
setting the appropriate expires/cache control header... than use the 
etag mechanism...

James

On 09/06/2015 14:56, Frederik Nosi wrote:
> Hi James,
>
> On 06/09/2015 02:36 PM, James Smith wrote:
>> Yes - it is the request over head - the client will still make the 
>> request at which point the server has got to decide has it changed 
>> before even -   which for most static requests is the heaviest 
>> (slowest) part before returning the not-changed response - and then 
>> serving the content!
>
> But at this point the server in case of a positive match will send 
> just a 304 reply with no content, thus saving bandwith and time (due 
> to eventual roundtrips) no?
>
>>
>> You are better to:
>>
>> (a) set near future or mid future headers [ expires in a month or in 
>> a year]
>
> Sure, the best request is the one that does not even come :-)
>
>> (b) alter filenames if you significantly change the file contents [ 
>> we use MD5 of content for js/css ]
>>
>
> This only if you're in the posisition to decide the site layout though.
>
>> Note this is "hyper-tuning" of Apache... some people may want to 
>> enable it - it was originally set up when most users were on 
>> 28K/33.6K modems (or slower) and the transfer of data was the slow 
>> part of the equation!
>>
>> James
>>
> [...]
>
>
> Thanks,
> Frederik




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