gateway通过过滤器修改uri

背景：

有时要根据不同的请求头或者请求参数动态修改路由的uri

实现方案：

使用全局过滤器（很关键）

https://blog.csdn.net/netyeaxi/article/details/115287385
package com.tl.gateway.filter;

import java.net.URI;
import java.net.URISyntaxException;

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.cloud.gateway.filter.RouteToRequestUrlFilter;
import org.springframework.cloud.gateway.support.ServerWebExchangeUtils;
import org.springframework.core.Ordered;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;

import reactor.core.publisher.Mono;

@Component
public class Myf implements GlobalFilter, Ordered {

    @Override
    public int getOrder() {
        return RouteToRequestUrlFilter.ROUTE_TO_URL_FILTER_ORDER + 1;
        // return 0;
    }

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        try {
            exchange.getAttributes().put(ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR, new URI("https://www.baidu.com"));
        } catch (URISyntaxException e) {
            e.printStackTrace();
        }

        Mono<Void> ret = chain.filter(exchange);
        exchange.getResponse().getHeaders();
        return ret;
    }
}