HTTP Servers
In almost all cases HTTP servers of one sort or another (Apache, IIS, Netscape) are used as a front end to the cluster. A client process is not required to know what server it is requesting a resource from—it sends all requests to the DNS name or IP on the front end. If the request is for a static Web page or perhaps a non-Java CGI script, it is handled by the HTTP server. All other requests are passed on to the WebLogic Server members of the cluster.
The HTTP servers pass requests on to the WebLogic servers in round-robin order—weighted algorithms are not supported.
HTTP Session State Replication
The other important feature of clustered HTTP servers is that they all support session state replication. This is a high-availability ...
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