代理连接超时时，关闭客户端连接。

packages/mitmproxy/src/lib/proxy/mitmproxy/createConnectHandler.js

@@ -86,13 +86,17 @@ function connect (req, cltSocket, head, hostname, port, dnsConfig/* , sniRegexpM
       const cost = new Date() - start
       const errorMsg = `代理连接超时: ${hostport}, cost: ${cost} ms`
       log.error(errorMsg)
+
+      cltSocket.destroy()
     })
     proxySocket.on('error', (e) => {
       // 连接失败，可能被GFW拦截，或者服务端拥挤
       const cost = new Date() - start
       const errorMsg = `代理连接失败: ${hostport}, cost: ${cost} ms, errorMsg: ${e.message}`
       log.error(errorMsg)
+
       cltSocket.destroy()
+
       if (isDnsIntercept && isDnsIntercept.dns && isDnsIntercept.ip !== isDnsIntercept.hostname) {
         const { dns, ip, hostname } = isDnsIntercept
         dns.count(hostname, ip, true)