Spring Cloud Hystrix java.net.ConnectException: Connection refused: connect-优快云博客

在搭建Spring Cloud微服务架构并使用Hystrix进行监控时，遇到`java.net.ConnectException: Connection refused: connect`异常。问题源于监控地址错误，原本应为`http://localhost:2103/actuator/hystrix.stream`，而非`http://localhost:2103/hystrix.stream`。进一步排查发现Actuator仅启用了部分端点，需通过配置开启`hystrix.stream`端点，例如使用`management.endpoints.web.exposure.include=health,info,env,metrics`或`management.endpoints.web.exposure.include=*`来允许访问。" 48202599,5304959,Linux内核中poll机制详解,"['Linux', 'kernel', 'poll机制']

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实践 Spring Cloud构建微服务架构：Hystrix监控面板【Dalston版】，出现如下异常：

2019-08-15 11:41:39.764 ERROR 27272 --- [nio-1301-exec-7] ashboardConfiguration$ProxyStreamServlet : Error proxying request: http://localhost:2103/hystrix.stream

java.net.ConnectException: Connection refused: connect
	at java.base/java.net.PlainSocketImpl.waitForConnect(Native Method) ~[na:na]
	at java.base/java.net.PlainSocketImpl.socketConnect(PlainSocketImpl.java:107) ~[na:na]
	at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:399) ~[na:na]
	at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:242) ~[na:na]
	at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:224) ~[na:na]
	at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:403) ~[na:na]
	at java.base/java.net.Socket.connect(Socket.java:591) ~[na:na]
	at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:121) ~[httpclient-4.5.9.jar:4.5.9]
	at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:180) ~[httpclient-4.5.9.jar:4.5.9]
	at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:326) ~[httpclient-4.5.9.jar:4.5.9]
	at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:605) ~[httpclient-4.5.9.jar:4.5.9]
	at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:440) ~[httpclient-4.5.9.jar:4.5.9]
	at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:835) ~[httpclient-4.5.9.jar:4.5.9]
	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83) ~[httpclient-4.5.9.jar:4.5.9]