（四）启用HTTPS

　　安全规范中有一条是要求尽量使用https而弃用http（新Chrome将标记非HTTPS网站为不安全），其实启用https和之前的ipv6改造一样，并不是什么高难度或者工作流繁多的的改造，只需将中间件启用https支持即可。在spring boot项目中，基本上都是使用内置的中间件（tomcat、netty等），下面记录下改造的思路：

方案1： 服务均启用https，步骤有：

1. 所有的micro service均启用https
2. 把eureka的注册地址改为https方式
3. 把config service的注册地址改为https方式
4. 把feign的调用方式改为支持https方式
5. 每个micro service均需导入证书，并且访问的时候需要导入证书（不然会报unable to find valid certification path to requested target错误）
6. 证书里需要把micro service的serviceId注册进去（不然会报Certificate doesn't match any of the subject alternative names错误）

方案比较稳妥，所有服务中均走了ssl，满足安全条件，就是乍一看改造量有点多啊......

方案2：micro service只会暴露gateway，其余服务均是不暴露的，因此我们可以只改造gateway服务，步骤有：

1. gateway service启用https
2. gateway service改造lb://micro_service_id的地址替换方式

该方案改造量最小，且由于spring cloud的服务隔离的关系，并无需担心其余服务的安全问题。

---

实现方案：

　　1. 生成证书

　　可以用JDK自带的keytool工具，来生成证书，具体语法为：

C:\Users\Administrator>keytool
密钥和证书管理工具

命令:

 -certreq            生成证书请求
 -changealias        更改条目的别名
 -delete             删除条目
 -exportcert         导出证书
 -genkeypair         生成密钥对
 -genseckey          生成密钥
 -gencert            根据证书请求生成证书
 -importcert         导入证书或证书链
 -importpass         导入口令
 -importkeystore     从其他密钥库导入一个或所有条目
 -keypasswd          更改条目的密钥口令
 -list               列出密钥库中的条目
 -printcert          打印证书内容
 -printcertreq       打印证书请求的内容
 -printcrl           打印 CRL 文件的内容
 -storepasswd        更改密钥库的存储口令

使用 "keytool -command_name -help" 获取 command_name 的用法

　　生成证书的语句为：

keytool -genkeypair -alias "ncdt" -keyalg "RSA" -keystore "C:\ncdt.keystore"

　　执行后，根据提示完成即可（测试用的话，直接一直按回车，最后确认y即可），如下图：

　　2. spring cloud gateway项目启用https（其实也就是spring boot项目启用https），只需要在application.yml里增加ssl配置即可。

server:
  port: 443
  ssl:
    key-alias: ncdt
    enabled: true
    key-store-password: password
    key-store-type: JKS
    key-store: ncdt.keystore

　　3.spring cloud gateway项目增加HttpsReconstructFilter

　　如何来重写这个filter呢，首先先不要写这个filter，直接启动gateway并访问地址：https://localhost/，就会报如下错误（里面的*****是我自己的服务名，故隐藏了）：

2018-09-19 11:19:26.420  INFO 10808 --- [ctor-http-nio-1] c.netflix.loadbalancer.BaseLoadBalancer  : Client: ***** instantiated a LoadBalancer: DynamicServerListLoadBalancer:{NFLoadBalancer:name=*****,current list of Servers=[],Load balancer stats=Zone stats: {},Server stats: []}ServerList:null
2018-09-19 11:19:26.424  INFO 10808 --- [ctor-http-nio-1] c.n.l.DynamicServerListLoadBalancer      : Using serverListUpdater PollingServerListUpdater
2018-09-19 11:19:26.427  INFO 10808 --- [ctor-http-nio-1] c.n.l.DynamicServerListLoadBalancer      : DynamicServerListLoadBalancer for client ***** initialized: DynamicServerListLoadBalancer:{NFLoadBalancer:name=*****,current list of Servers=[],Load balancer stats=Zone stats: {},Server stats: []}ServerList:org.springframework.cloud.netflix.ribbon.eureka.DomainExtractingServerList@7b98208b
2018-09-19 11:19:26.490 ERROR 10808 --- [ctor-http-nio-1] .a.w.r.e.DefaultErrorWebExceptionHandler : Failed to handle request [GET https://localhost/******]

org.springframework.cloud.gateway.support.NotFoundException: Unable to find instance for *****
    at org.springframework.cloud.gateway.filter.LoadBalancerClientFilter.filter(LoadBalancerClientFilter.java:72) ~[spring-cloud-gateway-core-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at org.springframework.cloud.gateway.handler.FilteringWebHandler$GatewayFilterAdapter.filter(FilteringWebHandler.java:133) ~[spring-cloud-gateway-core-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at org.springframework.cloud.gateway.filter.OrderedGatewayFilter.filter(OrderedGatewayFilter.java:44) ~[spring-cloud-gateway-core-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at org.springframework.cloud.gateway.handler.FilteringWebHandler$DefaultGatewayFilterChain.lambda$filter$0(FilteringWebHandler.java:115) ~[spring-cloud-gateway-core-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:45) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoPeekTerminal.subscribe(MonoPeekTerminal.java:61) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.Mono.subscribe(Mono.java:3080) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:172) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.Mono.subscribe(Mono.java:3080) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:172) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:150) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:67) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:76) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.innerNext(FluxConcatMap.java:271) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapInner.onNext(FluxConcatMap.java:803) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:108) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:67) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1083) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:144) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:108) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:76) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.innerNext(FluxConcatMap.java:271) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapInner.onNext(FluxConcatMap.java:803) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:73) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxPeek$PeekSubscriber.onNext(FluxPeek.java:185) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1083) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoFilterWhen$MonoFilterWhenMain.onNext(MonoFilterWhen.java:138) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:1640) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoFilterWhen$MonoFilterWhenMain.onSubscribe(MonoFilterWhen.java:103) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:54) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoFilterWhen.subscribe(MonoFilterWhen.java:56) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoPeek.subscribe(MonoPeek.java:71) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.Mono.subscribe(Mono.java:3080) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.drain(FluxConcatMap.java:418) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onNext(FluxConcatMap.java:241) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.onNext(FluxDematerialize.java:114) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.onNext(FluxDematerialize.java:42) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxIterable$IterableSubscription.slowPath(FluxIterable.java:244) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxIterable$IterableSubscription.request(FluxIterable.java:202) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.request(FluxDematerialize.java:157) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onSubscribe(FluxConcatMap.java:227) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.onSubscribe(FluxDematerialize.java:88) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:140) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:64) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxDematerialize.subscribe(FluxDematerialize.java:39) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxDefer.subscribe(FluxDefer.java:55) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxConcatMap.subscribe(FluxConcatMap.java:121) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoNext.subscribe(MonoNext.java:40) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoMap.subscribe(MonoMap.java:55) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoSwitchIfEmpty.subscribe(MonoSwitchIfEmpty.java:44) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoMap.subscribe(MonoMap.java:55) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.Mono.subscribe(Mono.java:3080) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.drain(FluxConcatMap.java:418) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onSubscribe(FluxConcatMap.java:210) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:140) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:64) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.FluxConcatMap.subscribe(FluxConcatMap.java:121) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoNext.subscribe(MonoNext.java:40) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoSwitchIfEmpty.subscribe(MonoSwitchIfEmpty.java:44) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoPeekTerminal.subscribe(MonoPeekTerminal.java:61) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:150) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1083) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoZip$ZipCoordinator.signal(MonoZip.java:247) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoZip$ZipInner.onNext(MonoZip.java:329) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:1640) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoZip$ZipInner.onSubscribe(MonoZip.java:318) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:54) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.Mono.subscribe(Mono.java:3080) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoZip.subscribe(MonoZip.java:128) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoPeekTerminal.subscribe(MonoPeekTerminal.java:61) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:74) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.Mono.subscribe(Mono.java:3080) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:172) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:70) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.core.publisher.MonoPeekTerminal.subscribe(MonoPeekTerminal.java:61) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]
    at reactor.ipc.netty.channel.ChannelOperations.applyHandler(ChannelOperations.java:380) ~[reactor-netty-0.7.8.RELEASE.jar:0.7.8.RELEASE]
    at reactor.ipc.netty.http.server.HttpServerOperations.onHandlerStart(HttpServerOperations.java:398) ~[reactor-netty-0.7.8.RELEASE.jar:0.7.8.RELEASE]
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute$$$capture(AbstractEventExecutor.java:163) ~[netty-common-4.1.27.Final.jar:4.1.27.Final]
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java) ~[netty-common-4.1.27.Final.jar:4.1.27.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404) ~[netty-common-4.1.27.Final.jar:4.1.27.Final]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:464) ~[netty-transport-4.1.27.Final.jar:4.1.27.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884) ~[netty-common-4.1.27.Final.jar:4.1.27.Final]
    at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_77]

　　可以看到里面调用的是ribbon的loadbalancer，因此我们可以直接看gateway里的全局过滤器接口GlobalFilter，找这个接口的所有实现类：

　　找到LoadBalancerClientFilter，可以看到这个filter调用了loadBalancer.reconstructURI(new DelegatingServiceInstance(instance, overrideScheme), uri)，并重新写入到GATEWAY_REQUEST_URL_ATTR中。

　　在继续往下找（代码不难），最终会看到这个filter是执行了RibbonUtils的一个私有方法upgradeConnection，功能是：如果调用的服务要求安全的，就判断原始uri的scheme是否是http，是则转化为https，否则就按照原始请求的。

　　那么我们的要求是gateway为https，转发后的uri依然保持http不变，与上功能相反，因此我们可以仿造LoadBalancerClientFilter，并重写RibbonUtils的upgradeConnection方法，调整filter的执行顺序，由于不是升级连接，因此重命名了一下，代码如下：

/**
 * @author zhangqiuyang
 * Created on 2018/6/9.
 */

@Configuration
public class HttpsReconstructFilter implements GlobalFilter, Ordered {

private static final int HTTPS_RECONSTRUCT_FILTER_ORDER = 10101;

    /**
     * Process the Web request and (optionally) delegate to the next
     * {@code WebFilter} through the given {@link GatewayFilterChain}.
     *
     * @param exchange the current server exchange
     * @param chain    provides a way to delegate to the next filter
     * @return {@code Mono<Void>} to indicate when request processing is complete
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        URI url = exchange.getAttribute(GATEWAY_REQUEST_URL_ATTR);
        if (url != null && "https".equals(url.getScheme())) {
            exchange.getAttributes().put(GATEWAY_REQUEST_URL_ATTR, reconstructURIConnection(url));
        }
        return chain.filter(exchange);
    }

    /**
     * 重构url，把https修改为http
     *
     * @param uri
     * @return
     */
    private static URI reconstructURIConnection(URI uri) {
        UriComponentsBuilder uriComponentsBuilder = UriComponentsBuilder.fromUri(uri).scheme("http");
        if (uri.getRawQuery() != null) {
            // When building the URI, UriComponentsBuilder verify the allowed characters and does not
            // support the '+' so we replace it for its equivalent '%20'.
            // See issue https://jira.spring.io/browse/SPR-10172
            uriComponentsBuilder.replaceQuery(uri.getRawQuery().replace("+", "%20"));
        }
        return uriComponentsBuilder.build(true).toUri();
    }

    /**
     * Get the order value of this object.
     * <p>Higher values are interpreted as lower priority. As a consequence,
     * the object with the lowest value has the highest priority (somewhat
     * analogous to Servlet {@code load-on-startup} values).
     * <p>Same order values will result in arbitrary sort positions for the
     * affected objects.
     *
     * @return the order value
     * @see #HIGHEST_PRECEDENCE
     * @see #LOWEST_PRECEDENCE
     */
    @Override
    public int getOrder() {
        return HTTPS_RECONSTRUCT_FILTER_ORDER;
    }
}

改造就完成了，重启服务后访问，就可以看到效果。

生产环境证书：

　　许多生产环境的证书都是从godaddy（参考官方帮助）或者其他网站上申请的，得到的是一个gd_bundle开头的.crt证书和一个随机名称.crt证书，那这时如果要在spring boot上用这个证书，则需要进行一下转换，把证书转换成jks证书。

openssl pkcs12 -export -in 随机名称证书.crt -inkey 私钥.key -out ncdt.p12 -name tomcat -CAfile gd_bundle开头证书.crt -caname root -chain

　　执行完会要求输入密码，自己指定即可。

keytool -importkeystore -destkeystore ncdt.jks -srckeystore ncdt.p12 -srcstoretype PKCS12

　　执行完再次输入密码，生成.jks文件。

同时，spring boot的ssl配置应该为：

server:
  port: 443
  ssl:
    enabled: true
    key-store-password: 密码
    key-store: ncdt.jks

重启完成配置。