Web Server Plug-in

The Web Server Plug-in uses a XML file called plugin-cfg.xml to determine whether a request is for the web server or the application server. When a request reaches Web server it will read the URI of the request and check if there is a <Uri> element for that URL if yes forward control to the corresponding server

Ex. Lets say Web server receives a request for http://localhost/cachemonitor (I am assuming that web server is listening on default HTTP port 80). It will take the request and check if there is a Uri element with value of Name attribute equal to /cachemonitor/*. If yes that means this request is for application server. Now it will find out the UriGroup parent element of Uri element and find value of its Name element which is default_host_WebSphere_Portal_sunpa_Cluster_URIs in my case. It will take this value and find out the corresponding Route element with value of UriGroup attribute equal to default_host_WebSphere_Portal_sunpa_Cluster_URIs. In this Route element it will read value of ServerCluster attribute and find the corresponding ServerCluster element. In my case ServerCluster has only one server element sunpa_WebSphere_Portal so it will read value of its Transport element and forward the request to http://sunpatil-wxp.cisco.com:10040/cachemonitor.
If you have more than one servers plugin can do the load balancing by forwarding requests to different servers in the cluster by using Round Robin load balancing algorithm.

The plug-in configuration file is generated using the WebSphere Application server administrative tools. Each time you make any changes in the WebSphere Application server configuration that would affect the plug-in configuration such as install web application or remove the web application (This will result in addition or removal of Uri element from plugin-cfg.xml), you need to regenerate and propagate the plug-in configuration file to the web server.

You can find that file in Plugins\config\<webservername>. This is sample plugin-cfg.xml file that i have on my local machine.


<?xml version="1.0" encoding="ISO-8859-1"?>
<!--HTTP server plugin config file for the webserver sunpa.sunpa.webserver1 generated on 2009.04.30 at 06:33:52 PM PDT-->
<Config ASDisableNagle="false" AcceptAllContent="false" AppServerPortPreference="HostHeader" ChunkedResponse="false" FIPSEnable="false" IISDisableNagle="false" IISPluginPriority="High" IgnoreDNSFailures="false" RefreshInterval="60" ResponseChunkSize="64" VHostMatchingCompat="false">
<Log LogLevel="Debug" Name="c:\IBM\HTTPServer\Plugins\logs\webserver1\http_plugin.log"/>
<Property Name="ESIEnable" Value="true"/>
<Property Name="ESIMaxCacheSize" Value="1024"/>
<Property Name="ESIInvalidationMonitor" Value="false"/>
<Property Name="ESIEnableToPassCookies" Value="false"/>
<VirtualHostGroup Name="default_host">
<VirtualHost Name="*:10000"/>
<VirtualHost Name="*:80"/>
<VirtualHost Name="*:10002"/>
<VirtualHost Name="*:10015"/>
<VirtualHost Name="*:10016"/>
<VirtualHost Name="*:443"/>
<VirtualHost Name="*:10023"/>
<VirtualHost Name="*:10026"/>
<VirtualHost Name="*:10025"/>
<VirtualHost Name="*:10040"/>
<VirtualHost Name="*:10035"/>
<VirtualHost Name="*:10041"/>
</VirtualHostGroup>
<ServerCluster CloneSeparatorChange="false" GetDWLMTable="false" IgnoreAffinityRequests="true" LoadBalance="Round Robin" Name="WebSphere_Portal_sunpa_Cluster" PostBufferSize="64" PostSizeLimit="-1" RemoveSpecialHeaders="true" RetryInterval="60">
<Server ConnectTimeout="0" ExtendedHandshake="false" MaxConnections="-1" Name="sunpa_WebSphere_Portal" ServerIOTimeout="0" WaitForContinue="false">
<Transport Hostname="sunpatil-wxp.cisco.com" Port="10040" Protocol="http"/>
<Transport Hostname="sunpatil-wxp.cisco.com" Port="10035" Protocol="https">
<Property Name="keyring" Value="c:\IBM\HTTPServer\Plugins\config\webserver1\plugin-key.kdb"/>
<Property Name="stashfile" Value="c:\IBM\HTTPServer\Plugins\config\webserver1\plugin-key.sth"/>
</Transport>
</Server>
</ServerCluster>
<ServerCluster CloneSeparatorChange="false" GetDWLMTable="false" IgnoreAffinityRequests="true" LoadBalance="Round Robin" Name="server1_sunpa_Cluster" PostBufferSize="64" PostSizeLimit="-1" RemoveSpecialHeaders="true" RetryInterval="60">
<Server ConnectTimeout="0" ExtendedHandshake="false" MaxConnections="-1" Name="sunpa_server1" ServerIOTimeout="0" WaitForContinue="false">
<Transport Hostname="sunpatil-wxp.cisco.com" Port="10000" Protocol="http"/>
<Transport Hostname="sunpatil-wxp.cisco.com" Port="10002" Protocol="https">
<Property Name="keyring" Value="c:\IBM\HTTPServer\Plugins\config\webserver1\plugin-key.kdb"/>
<Property Name="stashfile" Value="c:\IBM\HTTPServer\Plugins\config\webserver1\plugin-key.sth"/>
</Transport>
</Server>
</ServerCluster>
<UriGroup Name="default_host_server1_sunpa_Cluster_URIs">
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/snoop/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/hello"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/hitcount"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="*.jsp"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="*.jsv"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="*.jsw"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/j_security_check"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/ibm_security_logout"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/servlet/*"/>
</UriGroup>
<Route ServerCluster="server1_sunpa_Cluster" UriGroup="default_host_server1_sunpa_Cluster_URIs" VirtualHostGroup="default_host"/>
<UriGroup Name="default_host_WebSphere_Portal_sunpa_Cluster_URIs">
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/searchfeed/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/contentapi/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_WPS_Welcome/WelcomePortlet/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_WPS_Welcome/*.jsp"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_WPS_Welcome/*.jsv"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_WPS_Welcome/*.jsw"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_WPS_Welcome/j_security_check"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_WPS_Welcome/ibm_security_logout"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_Import_XML/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/richText/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_Blurb/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_Settings/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_Policy_Status/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_Login_Portlet_App/Login Portlet/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_Login_Portlet_App/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_FrequentUsers/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wsrp/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/config/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/config/*.jsp"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/config/*.jsv"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/config/*.jsw"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/config/j_security_check"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/config/ibm_security_logout"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wp_proxy/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_URL_mapping/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_appearance/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_PllelRenderingTest/ParallelRenderingTest/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_PllelRenderingTest/ParallelRenderingPortlet2/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_PllelRenderingTest/SeqRenderingPortlet1/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_PllelRenderingTest/SeqRenderingPortlet2/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_PllelRenderingTest/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_MageVirtualPortals/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_Search_Center/Search Center/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_Search_Center/Sponsored Links/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_Search_Center/External Search Engine/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_Search_Center/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_ThemesAndSkinsMgr/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_People_Finder/People Finder JSR168/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_People_Finder/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_Eecontentandlayout/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/WSPolicyManager/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_dynamicpersontag/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/cachemonitor/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/jcradmin/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_Manage_Webservices/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_Web/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps_semanticTag/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/web/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/um/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/um/*.jsp"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/um/*.jsv"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/um/*.jsw"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/um/j_security_check"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/um/ibm_security_logout"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/seedlist/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_UniqueNames/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_Properties/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_Set_Permissions/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_ResourceView/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_PolicyEditorCA/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_Community_Port_App/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/iehs/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/ProfileServiceTest/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/pznutilities/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_PTransformationApp/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_Tracing/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_SearchSitemapPort/Sitemap/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_SearchSitemapPort/*"/>
<Uri AffinityCookie="JSESSIONID" AffinityURLIdentifier="jsessionid" Name="/wps/PA_Principals_Manager/*"/>
</UriGroup>
<Route ServerCluster="WebSphere_Portal_sunpa_Cluster" UriGroup="default_host_WebSphere_Portal_sunpa_Cluster_URIs" VirtualHostGroup="default_host"/>
<RequestMetrics armEnabled="false" loggingEnabled="true" rmEnabled="false" traceLevel="HOPS">
<filters enable="false" type="URI">
<filterValues enable="false" value="/snoop"/>
<filterValues enable="false" value="/hitcount"/>
</filters>
<filters enable="false" type="SOURCE_IP">
<filterValues enable="false" value="255.255.255.255"/>
<filterValues enable="false" value="254.254.254.254"/>
</filters>
<filters enable="false" type="JMS">
<filterValues enable="false" value="destination=aaa"/>
</filters>
<filters enable="false" type="WEB_SERVICES">
<filterValues enable="false" value="wsdlPort=aaa:op=bbb:nameSpace=ccc"/>
</filters>
</RequestMetrics>
</Config>