IBM 6.1.X manual Internet Explorer Support of Vary Header, Caching Proxy Tuning

Internet Explorer Support of Vary Header

When Internet Explorer 7 is sent a ‘vary’ http header, it is unable to cache that reply effectively. To configure WebSphere portal to not send the vary header to IE 7, log in as portal administrator and navigate to Administration -> Portal Settings -> Supported Clients. Then select IE 7 as the browser and remove support for the ‘vary’ header.

Caching Proxy Tuning

The following are the settings and tunings specified in the reverse proxy’s ibmproxy.conf file for the Web 2.0 performance test.

Table 17: Reverse Proxy Settings

Parameter	Setting Used	Additional Information
Proxy /wps/* http://{server-name}/wps/*		Proxy for /wps
Proxy /wps_semanticTag* http://{server-		Proxy for /wps_semanticTag
name}/wps_semanticTag* :80
Proxy /searchfeed* http://{server-name}/searchfeed* :80		Proxy for /searchfeed
ConnThreads	15
ServerConnPool	on
MaxSocketPerServer	20
CacheTimeMargin	5 seconds
CacheFileSizeLimit	2 M
flexibleSocks	off
LimitRequestFieldSize	16384
CompressionFilterEnable	C:\PROGRA~1\IBM\edge\
	cp\Bin\mod_z.dll
CompressionFilter	Image/bitmap,text/css,text/	Compresses everything except text/html,
AddContentType	xml,application/xml	application/atom+xml, text/plain,
		application/x-javascript. Portal
		compresses those types. Experiments
		were done where reverse proxy gzipped
		those files as well which caused the
		reverse proxy CPU to become a
		bottleneck. If a more powerful reverse
		proxy server was available, it might make
		sense to do all gzipping on the reverse
		proxy. Note that fixes for PMR 43866,499
		were applied to Edge Server v6.02 to get
		proper gzipping behavior.

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W E BS P HE R E P O R T AL V 6 . 1 T U N I N G G U I D E