[horde] Performance problems reloading the sidebar with HTTPS and IE

[Jan Schneider]

http://cvs.horde.org/diff.php/horde/docs/PERFORMANCE?r1=1.18&r2=1.19&ty=u

Zitat von Robin Rainton <robin at rainton.com>:

> I use this in the <VirtualHost> section of my Apache config to try and make
> browsers cache SSL images, scripts, etc:
>
>    ExpiresActive On
>    ExpiresByType image/png "now plus 1 month"
>    ExpiresByType image/gif "now plus 1 month"
>    ExpiresByType text/javascript "now plus 1 month"
>    ExpiresByType text/css "now plus 1 month"
>
> Am not convinced this works, but you might like to play with something
> similar.
>
> FWIW, I had to turn keepalives off because there are some buggy proxies
> around.
> Basically, the proxy would drop connection to the server, but inside the LAN
> being served by the proxy, the client wouldn't know this had happened. This
> manifiests itself as composing a mail (with IMP) on popup window would only
> send if you typed it really fast (before keepalive timeout). Otherwise some
> dodgy error from the proxy was returned when trying to send. Rather
> annoying as
> you can imagine.
>
> That problem wasn't limited to Horde, BTW, other SSL sites we're serving also
> failed.
>
> Robin
>
> Quoting Han Spruyt <han.spruyt at ijsselgroep.nl>:
>
>>>> I'm wondering what Apache HTTP server version you are using?
>>>>
>>>> In this case 1.3.34.
>>>
>>> Ghm. I don't know how about your version, but on my machines (apache
>>> 2.0.46 on redhat enterprise linux 3.0) I had similar problem. I
>>> solved it by commenting out:
>>>
>>> #SetEnvIf User-Agent ".*MSIE.*" \
>>> #         nokeepalive ssl-unclean-shutdown \
>>> #         downgrade-1.0 force-response-1.0
>>>
>>> in ssl.conf. As far as I know all new redhat versions comes with this
>>> old apache ssl configuration file.
>>>
>> This solves something in the latest IE 6 versions, but breaks
>> compatibility with IE 5.
>>
>> It makes IE about as fast as Firefox in SSL connections because of the
>> keepalive.
>>
>> There is good information about this stuff here:
>> http://www.gossamer-threads.com/lists/apache/dev/299145
>>
>> It is not a solution though for the problems with the 304's in the
>> access log.
>>
>> The problem was, the cache content expired immediately, so browsers
>> asked for new versions of every element on every page load.
>>
>> With setExpires on in the apache config the browser only askes for new
>> versions of dynamic content. On a not so small site that saves a lot of
>> SSL traffic. It really speeds up things for the user. We suffered page
>> load times of up to 2 minutes, which is now reduced do a few seconds at
>> most.
>>
>> Han.
>>
>>
>>
>> Han Spruyt.
>>
>>
>>
>>
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>
>
>
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>



Jan.

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