Spring Cloud Gateway只有Pre和POST两种类型的Filter

package org.springframework.cloud.gateway.filter.factory;
import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.http.server.reactive.ServerHttpRequest;
/**
 * @author Spencer Gibb
 */
public class AddRequestHeaderGatewayFilterFactory extends AbstractNameValueGatewayFilterFactory {
	@Override
	public GatewayFilter apply(NameValueConfig config) {
		return (exchange, chain) -> {
			ServerHttpRequest request = exchange.getRequest().mutate()
					.header(config.getName(), config.getValue())
					.build();
			return chain.filter(exchange.mutate().request(request).build());
		};
    }
}

public class SetStatusGatewayFilterFactory extends AbstractGatewayFilterFactory<SetStatusGatewayFilterFactory.Config> {
    @Override
    public GatewayFilter apply(Config config) {
        final HttpStatus status = ServerWebExchangeUtils.parse(config.status);
        return (exchange, chain) -> {
            return chain.filter(exchange).then(Mono.fromRunnable(() -> {
                // check not really needed, since it is guarded in setStatusCode,
                // but it's a good example
                if (!exchange.getResponse().isCommitted()) {
                    setResponseStatus(exchange, status);
                }
            }));
        };
    }
}