获取SpringCloud gateway 响应的response的值，可以查看、修改

gateway获取、修改客户端请求Request的参数，我们在上一篇已经讲过了。那么网关发起请求后，微服务返回回来的response的值，还是要经过网关才发给客户端的。很多时候，我们希望能看到响应的值，或者修改它。那么怎么做呢？

    import org.reactivestreams.Publisher;     import org.springframework.cloud.gateway.filter.GatewayFilterChain;     import org.springframework.cloud.gateway.filter.GlobalFilter;     import org.springframework.core.Ordered;     import org.springframework.core.io.buffer.DataBuffer;     import org.springframework.core.io.buffer.DataBufferFactory;     import org.springframework.core.io.buffer.DataBufferUtils;     import org.springframework.http.server.reactive.ServerHttpResponse;     import org.springframework.http.server.reactive.ServerHttpResponseDecorator;     import org.springframework.stereotype.Component;     import org.springframework.web.server.ServerWebExchange;     import reactor.core.publisher.Flux;     import reactor.core.publisher.Mono;           import java.nio.charset.Charset;           /**      * @author wuweifeng wrote on 2018/10/31.      */     @Component     public class WrapperResponseGlobalFilter implements GlobalFilter, Ordered {         @Override         public int getOrder() {             // -1 is response write filter, must be called before that             return -2;         }               @Override         public Mono filter(ServerWebExchange exchange, GatewayFilterChain chain) {             ServerHttpResponse originalResponse = exchange.getResponse();             DataBufferFactory bufferFactory = originalResponse.bufferFactory();             ServerHttpResponseDecorator decoratedResponse = new ServerHttpResponseDecorator(originalResponse) {                 @Override                 public Mono writeWith(Publisher