Hands-On Spring Security 5 for Reactive Applications

Using HandlerFilterFunction

We will implement a new HandlerFilterFunction, SampleHandlerFilterFunction, in which we will look at a path variable (pathVariable) and check for its value. If the value is equal to value2, we will mark the status as BAD_REQUEST. It's important to note that since HandlerFilterFunction applies only to functional-based, even though the path variable value is equal to value2, the status is not stamped as BAD_REQUEST, and the response received is OK:

public class SampleHandlerFilterFunction implements         HandlerFilterFunction<ServerResponse, ServerResponse> {    @Override    public Mono<ServerResponse> filter(ServerRequest serverRequest,         HandlerFunction<ServerResponse> handlerFunction) { if (serverRequest.pathVariable("pathVariable") ...