@NonNull
    private Mono<ServerResponse> postHandler(final ServerRequest req) {
        final Mono<String> string = req.bodyToMono(String.class);
        return ok().body(string, String.class);
    }
Routes router function.

@return the router function
shenyu-examples/shenyu-examples-http/src/main/java/org/apache/shenyu/examples/http/router/ShenyuTestHttpRouter.java