一般SpringCloud中超时配置，含Hystrix/Ribbon两部分：
ribbon: ReadTimeout: 120000 ConnectTimeout: 120000 hystrix: command: default: execution: isolation: strategy: THREAD thread: timeoutInMilliseconds: 120000
hystrix thread timeout需要比ribbon timeout设置时间长。
ribbon有retry机制，如果timeout设置时间短，则无法retry。在zuul中，如果使用的是服务发现，ribbon timeout同上。
如果使用的指定URL形式，ribbon timeout需要如下配置：zuul: host: connect-timeout-millis: 120000 socket-timeout-millis: 120000
8.13 Zuul Timeouts If you want to configure the socket timeouts and read timeouts for requests proxied through Zuul, you have two options, based on your configuration: If Zuul uses service discovery, you need to configure these timeouts with the ribbon.ReadTimeout and ribbon.SocketTimeout Ribbon properties. If you have configured Zuul routes by specifying URLs, you need to use zuul.host.connect-timeout-millis and zuul.host.socket-timeout-millis.