2023/08/06 17:14:27.188633 [ants]: worker exits from panic: net/http: internal error: connCount underflow
goroutine 414 [running]:
runtime/debug.Stack()
        /usr/lib/golang/src/runtime/debug/stack.go:24 +0x65
github.com/panjf2000/ants/v2.(*goWorker).run.func1.1()
        /root/go/pkg/mod/github.com/panjf2000/ants/v2@v2.8.1/worker.go:56 +0x89
panic({0xf2e2a0, 0x1217930})
        /usr/lib/golang/src/runtime/panic.go:884 +0x212
net/http.(*Transport).decConnsPerHost(0xc000002f00, {{0xc003eb83c0, 0x34}, {0x10d58e0, 0x5}, {0xc0010cc3a8, 0x13}, 0x0})
        /usr/lib/golang/src/net/http/transport.go:1476 +0x592
net/http.(*Transport).roundTrip(0xc000002f00, 0xc005bb4e00)
        /usr/lib/golang/src/net/http/transport.go:605 +0x88b
net/http.(*Transport).RoundTrip(0xc005bb4e00?, 0x121a860?)
        /usr/lib/golang/src/net/http/roundtrip.go:17 +0x19
net/http.send(0xc005bb4b00, {0x121a860, 0xc000002f00}, {0x105c1a0?, 0x4d4601?, 0x1ba1180?})
        /usr/lib/golang/src/net/http/client.go:251 +0x5f7
net/http.(*Client).send(0xc0004988a0, 0xc005bb4b00, {0xc003f21760?, 0xc00501e630?, 0x1ba1180?})
        /usr/lib/golang/src/net/http/client.go:175 +0x9b
net/http.(*Client).do(0xc0004988a0, 0xc005bb4b00)
        /usr/lib/golang/src/net/http/client.go:715 +0x8fc
net/http.(*Client).Do(...)
        /usr/lib/golang/src/net/http/client.go:581

func getTransport() *http.Transport {
	transport := http.DefaultTransport.(*http.Transport).Clone()
	transport.MaxIdleConns = config.SieveConfig.Transport.MaxIdleConnCount
	transport.MaxConnsPerHost = config.SieveConfig.Transport.MaxConnCount
	transport.MaxIdleConnsPerHost = config.SieveConfig.Transport.MaxIdleConnCount
	transport.DisableKeepAlives = false
	//transport.IdleConnTimeout = 90 * time.Second
	transport.TLSHandshakeTimeout = 20 * time.Second
	transport.ExpectContinueTimeout = 8 * time.Second

	header := http.Header{}
	//header.Add("Connection", "close")
	transport.ProxyConnectHeader = header

	timeout := 8 * time.Second
	transport.DialContext = (&net.Dialer{
		Timeout: timeout,
	}).DialContext
	transport.TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
	proxyurl, err := url.Parse(ProxyServiceIpProviderImpl.GetProxy())
	if err != nil {
		panic(err)
	}
	transport.Proxy = http.ProxyURL(proxyurl)
	return transport
}