##序 ribbon的超时设置，只能按转发的serviceId来分的，无法像nginx那样直接在每个转发的链接里头设置超时时间。这里hack一下，实现url基本的ribbon超时时间设置。具体的思路就是重写RibbonApacheHttpRequest的toRequest方法，然后进行设置。

##CustomRibbonApacheHttpRequest

public class CustomRibbonApacheHttpRequest extends RibbonApacheHttpRequest {public CustomRibbonApacheHttpRequest(RibbonCommandContext context) {super(context);}@Overridepublic HttpUriRequest toRequest(RequestConfig requestConfig) {final RequestBuilder builder = RequestBuilder.create(this.context.getMethod());builder.setUri(this.uri);for (final String name : this.context.getHeaders().keySet()) {final List<String> values = this.context.getHeaders().get(name);for (final String value : values) {builder.addHeader(name, value);}}for (final String name : this.context.getParams().keySet()) {final List<String> values = this.context.getParams().get(name);for (final String value : values) {builder.addParameter(name, value);}}if (this.context.getRequestEntity() != null) {final BasicHttpEntity entity;entity = new BasicHttpEntity();entity.setContent(this.context.getRequestEntity());// if the entity contentLength isn't set, transfer-encoding will be set// to chunked in org.apache.http.protocol.RequestContent. See gh-1042if (this.context.getContentLength() != null) {entity.setContentLength(this.context.getContentLength());} else if ("GET".equals(this.context.getMethod())) {entity.setContentLength(0);}builder.setEntity(entity);}customize(this.context.getRequestCustomizers(), builder);//todo 这里处理个性的timeout信息if(uri.getPath().equals("/review/timeout")){RequestConfig.Builder configBuilder = RequestConfig.copy(builder.getConfig());configBuilder.setConnectionRequestTimeout(30*1000);configBuilder.setConnectTimeout(30*1000);configBuilder.setSocketTimeout(30*1000);builder.setConfig(configBuilder.build());}else{builder.setConfig(requestConfig);}return builder.build();}
}

##CustomHttpClientRibbonCommand

public class CustomHttpClientRibbonCommand extends HttpClientRibbonCommand {public CustomHttpClientRibbonCommand(String commandKey, RibbonLoadBalancingHttpClient client, RibbonCommandContext context, ZuulProperties zuulProperties) {super(commandKey, client, context, zuulProperties);}public CustomHttpClientRibbonCommand(String commandKey, RibbonLoadBalancingHttpClient client, RibbonCommandContext context, ZuulProperties zuulProperties, ZuulFallbackProvider zuulFallbackProvider) {super(commandKey, client, context, zuulProperties, zuulFallbackProvider);}@Overrideprotected RibbonApacheHttpRequest createRequest() throws Exception {RibbonApacheHttpRequest ribbonApacheHttpRequest = new CustomRibbonApacheHttpRequest(this.context);return ribbonApacheHttpRequest;}
}

##CustomHttpClientRibbonCommandFactory

public class CustomHttpClientRibbonCommandFactory extends HttpClientRibbonCommandFactory{private final SpringClientFactory clientFactory;private final ZuulProperties zuulProperties;public CustomHttpClientRibbonCommandFactory(SpringClientFactory clientFactory, ZuulProperties zuulProperties) {super(clientFactory, zuulProperties);this.clientFactory = clientFactory;this.zuulProperties = zuulProperties;}public CustomHttpClientRibbonCommandFactory(SpringClientFactory clientFactory, ZuulProperties zuulProperties, Set<ZuulFallbackProvider> fallbackProviders) {super(clientFactory, zuulProperties, fallbackProviders);this.clientFactory = clientFactory;this.zuulProperties = zuulProperties;}@Overridepublic HttpClientRibbonCommand create(RibbonCommandContext context) {ZuulFallbackProvider zuulFallbackProvider = getFallbackProvider(context.getServiceId());final String serviceId = context.getServiceId();final RibbonLoadBalancingHttpClient client = this.clientFactory.getClient(serviceId, RibbonLoadBalancingHttpClient.class);client.setLoadBalancer(this.clientFactory.getLoadBalancer(serviceId));return new CustomHttpClientRibbonCommand(serviceId, client, context, zuulProperties, zuulFallbackProvider);}
}

##配置

@Autowired(required = false)private Set<ZuulFallbackProvider> zuulFallbackProviders = Collections.emptySet();@Bean@ConditionalOnMissingBeanpublic RibbonCommandFactory<?> ribbonCommandFactory(SpringClientFactory clientFactory, ZuulProperties zuulProperties) {return new CustomHttpClientRibbonCommandFactory(clientFactory, zuulProperties, zuulFallbackProviders);}

##网关的超时层级 ###zuul

zuul:max:host:connections: 500host:socket-timeout-millis: 60000connect-timeout-millis: 60000

###ribbon

ribbon:ReadTimeout: 10000ConnectTimeout: 10000MaxAutoRetries: 0MaxAutoRetriesNextServer: 1eureka:enabled: true

###hystrix

hystrix:command:default:execution:timeout:enabled: trueisolation:thread:timeoutInMilliseconds: 60000

##小结 走网关的话，有三层的超时时间，一个是zuul的，一个是ribbon的，还有一个是hystrix的。hystrix的超时设置，AbstractRibbonCommand这个类没有暴露设置hystrix的Setter方法出来，所以无法通过继承的方式来扩展。因此要自定义ribbon超时的话，需要这个超时时间是小于hystrix的，不然就提前被hystrix超时了，无法起到效果。