@Override
    public Mono<Void> writeWith(final Publisher<? extends DataBuffer> body) {
        this.isCache = true;
        this.body = Flux.from(body);
        return Mono.empty();
    }
writeWith.

@param body writeWith body
@return Mono
shenyu-plugin/shenyu-plugin-base/src/main/java/org/apache/shenyu/plugin/base/support/CachedBodyOutputMessage.java