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WebSphere Web service caching support
WebSphere Application Server caches Web service requests. Instead of processing the request it returns the cached response if there is one. The same fundamental caching principle, which we described in chapter 2, is employed again. A cache key is computed from a hash of the SOAP envelope. When a Web service request is made, the SOAP envelope is hashed and the key used to retrieve a previously cached response (or to store the response to the new request as a cache entry).
Details of Web service caching support can be found from the WebSphere information center at:
http://publib.boulder.ibm.com/infocenter/wasinfo/v6r0/topic/com.ibm.websphere.express.doc/info/exp/ae/rdyn_webservicescaching.html