95752ef1c9
1. Update the HandlerMapping contract to state that CORS checks are expected to be applied before returning a handler. 2. DispatcherHandler checks explicitly for pre-flight requests or CORS failed requests and skips handling for both. Technically no change since AbstractHandlerMapping already returns a NO_OP_HANDLER for those cases. The purpose however is for the DispatcherHandler to also guarantee more explicitly that no such handling can take place for such cases. As one consequence, this makes it possible to invoke the DispatcherHandler from anywhere in the WebFilter chain in order to "handle" a pre-flight request, and then skip the rest of the WebFilter chain. See gh-26257
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