GZIP Compression Issues - IE Developer Toolbar showing wrong Compression/Encoding Headers – IHS

As part of the portal performance tuning, have enabled the GZIP compression on IBM HTTP server by adding following lines httpd.conf and restarted the IHS.

LoadModule deflate_module modules/mod_deflate.so

#Enable GZIP Compression

DeflateFilterNote Input instream

DeflateFilterNote Output outstream

# Insert filter

SetOutputFilter DEFLATE

# Netscape 4.x has some problems...

BrowserMatch ^Mozilla/4 gzip-only-text/html

# Netscape 4.06-4.08 have some more problems

BrowserMatch ^Mozilla/4\.0[678] no-gzip

# MSIE masquerades as Netscape, but it is fine

BrowserMatch \bMSIE !no-gzip !gzip-only-text/html

# Don't compress images

SetEnvIfNoCase Request_URI \

\.(?:gif|jpe?g|png|exe)$ no-gzip dont-vary

Mozilla is showing proper Content-Encoding response headers   but Internet explorer always returns response without compression headers when we monitor through IE Developer tool bar. 

After proper analysis realized that IE Developer toolbar is not showing the proper response header for the compression.To find out actual compression details , Add the following to httpd.conf  and restart the server

DeflateFilterNote Input instream

DeflateFilterNote Output outstream

DeflateFilterNote Ratio ratio

LogFormat '"%r" %{outstream}n/%{instream}n (%{ratio}n%%)' deflate

CustomLog /tmp/logs/siva_test_compression_log deflate

Following was logged to “siva_test_compression_log when we access from IE7

GET /wps/portal/ welcome/!ut/p/b1/04_Sj9CPykssy0xPLMnMz0vMAfGjzOINjA1cLZ0MHQ0MXP0cDTwDLEN9PNxCDAxcjIAKIpEV- 4/d5/L2dBISEvZ0FBIS9nQSEh/ HTTP/1.1" 16010/71089 (22%)

"GET /mccbuilder/css/portal_editmode_widgets.css HTTP/1.1" -/- (-%)

"GET /portal_dojo/v1.4.3/dijit/themes/tundra/tundra.css HTTP/1.1" -/- (-%)

"GET /wps/contenthandler/!ut/p/digest!T/dav/fs-type1/common-resources/ibm/css/common.css HTTP/1.1" -/- (-%)

"GET /portal_dojo/v1.4.3/com/ibm/widgets/css/widgets_combined.css HTTP/1.1" -/- (-%)

"GET /wps/contenthandler/!ut/p/digest! /res/SivaTheme/themes/html/SivaTheme/css/master.css HTTP/1.1" -/- (-%)

"GET /SivaTestTheme/styles/layout.css HTTP/1.1" 1188/3524 (33%)

"GET /SivaTestTheme/styles/wcm/wcm.css HTTP/1.1" 1129/3836 (29%)

"GET /SivaTestTheme/styles/ie.css HTTP/1.1" 160/190 (84%)

"GET /SivaTestTheme/scripts/html5shiv.js HTTP/1.1" 1083/2050 (52%)

"GET /portal_dojo/v1.4.3/dojo/dojo.js HTTP/1.1" -/- (-%)

"GET /portal_dojo/v1.4.3/dojo/nls/dojo_en.js HTTP/1.1" -/- (-%)

"GET /SivaTestTheme/themes/html/SivaTestTheme/js/asa_cmAggr.js HTTP/1.1" 2665/7534 (35%)

"GET /SivaTestTheme/themes/html/SivaTestTheme/js/custom.js HTTP/1.1" 1596/4931 (32%)

"GET /SivaTestTheme/images/theme/page-bkg.jpg HTTP/1.1" -/- (-%)

"GET /SivaTestTheme/scripts/displayDate.js HTTP/1.1" 233/381 (61%)

"GET /SivaTestTheme/images/theme/bannerLeftLogo.png HTTP/1.1" -/- (-%)

"GET /portal_dojo/v1.4.3/dojo/resources/blank.gif HTTP/1.1" -/- (-%)

"GET /SivaTestTheme/images/alert.png HTTP/1.1" -/- (-%)

"GET /SivaTestTheme/styles/wcm/alert.css HTTP/1.1" 518/1527 (33%)

"GET /SivaTestTheme/images/theme/top-menu-seperator.jpg HTTP/1.1" -/- (-%)

"GET /SivaTestTheme/images/theme/bannerRight.png HTTP/1.1" -/- (-%)

"GET /SivaTestTheme/images/theme/tab-menu-bkg.jpg HTTP/1.1" -/- (-%)

"GET /SivaTestTheme/images/theme/tab-menu-bkg-highlight.jpg HTTP/1.1" -/- (-%)

"GET /portal_dojo/v1.4.3/com/ibm/widgets/css/images/bwArrows.png HTTP/1.1" -/- (-%)

"GET /SivaTestTheme/images/theme/tab-menu-bottom-bar.jpg HTTP/1.1" -/- (-%)

"GET /SivaTestTheme/images/theme/content-bkg.jpg HTTP/1.1" -/- (-%)

"GET /wps/contenthandler/!ut/p/digest!TXuRWzXY7QQZLuFyFmUoKQ/dav/fs-type1/common-resources/ibm/css/portal/images/ButtonBackground.gif HTTP/1.1" -/- (-%)

"GET /wps/wcm/connect/e76fe831-d81b-4d3d-b383-cb028bc7ad03/CustomGlobe.png?MOD=AJPERES&CACHEID=e76fe831-d81b-4d3d-b383-cb028bc7ad03 HTTP/1.1" -/- (-%)

"GET /wps/wcm/connect/7384f79b-798b-4007-97ad-85c84ff82438/images+%289%29.jpg?MOD=AJPERES&CACHEID=7384f79b-798b-4007-97ad-85c84ff82438 HTTP/1.1" -/- (-%)

"GET /SivaTestTheme/images/leftArrow.png HTTP/1.1" -/- (-%)

"GET /SivaTestTheme/images/theme/footerLogoTrans.png HTTP/1.1" -/- (-%)

"GET /SivaTestTheme/images/skin/sprite32.png HTTP/1.1" -/- (-%)

"GET /SivaTestTheme/images/theme/footerGrad.jpg HTTP/1.1" -/- (-%)

"GET /wps/menu/menu_service.js HTTP/1.1" 3507/10925 (32%)

"GET /wps_semanticTag/javascript/semanticTagService.js HTTP/1.1" 45670/186100 (24%)

"GET /SivaTestTheme/themes/html/SivaTestTheme/js/nls/theme_en.js HTTP/1.1" 22490/81943 (27%)

"GET /SivaTestTheme/themes/html/SivaTestTheme/js/theme.js HTTP/1.1" 515299/2498285 (20%)

"GET /wps/contenthandler/%21ut/p/digest%21FWMinu5Of_321wJCNoFzLA/model/service-document HTTP/1.1" -/- (-%)

"GET /portal_dojo/v1.4.3/dojo/resources/iframe_history.html HTTP/1.1" 718/1299 (55%)

"GET /mccenabler/js/com/ibm/mm/iwidget/image/progress-anim.gif HTTP/1.1" -/- (-%)

"GET /wps/contenthandler/!ut/p/digest!FWMinu5Of_321wJCNoFzLA/res/SivaTestTheme/themes/html/SivaTestTheme/js/init.js HTTP/1.1" -/- (-%)

"GET /wps/contenthandler/!ut/p/digest!FWMinu5Of_321wJCNoFzLA/res/SivaTestTheme/themes/html/SivaTestTheme/images/favicon.ico HTTP/1.1" -/- (-%)

"GET /SivaTestTheme/skins/html/SivaTestSkin/js/skin.js HTTP/1.1" 1449/3880 (37%)

"GET /wps/contenthandler/!ut/p/digest!FWMinu5Of_321wJCNoFzLA/mashup/mashup:huffman/n0wypzQB/Z2F scopeZ3DpublicZ26ampZ3BvaryZ3DnoneZ22/aw7OKMEINga6xr-u8adr_OoaP9o3 HTTP/1.1" -/- (-%)

"GET /wps_semanticTag/ui/styles.css HTTP/1.1" 1295/5334 (24%)

"GET /portal_dojo/v1.4.3/dijit/themes/tundra/images/spriteArrows.png HTTP/1.1" -/- (-%)