When I request a api use the class below, the error occurred, I can't find the reason for a long time , so please help me , thanks !!!

What version of Go are you using (go version)?

$ go version
Output from go version
go version go1.10.2 linux/amd64

Does this issue reproduce with the latest release?

i don't know

What operating system and processor architecture are you using (go env)?

$ go env
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/daiyingzong/.cache/go-build"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/srv/go-project"
GORACE=""
GOROOT="/opt/go"
GOTMPDIR=""
GOTOOLDIR="/opt/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build343006260=/tmp/go-build -gno-record-gcc-switches"

What did you do?

const (
MaxIdleConns int = 200
MaxIdleConnsPerHost int = 200
IdleConnTimeout int = 90
)

func NewHttp() *HttpBase {
once.Do(CreateHTTPClient)
return &HttpBase{
Client: client,
}
}

// createHTTPClient for connection re-use
func CreateHTTPClient() {
client = &http.Client{
Transport: &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: 3 * time.Second,
KeepAlive: 30 * time.Second,
}).DialContext,
MaxIdleConns: MaxIdleConns,
MaxIdleConnsPerHost: MaxIdleConnsPerHost,
IdleConnTimeout: 60 * time.Second,
},
}
}

type HttpResult struct {
HttpCode int
Body string
}

func (h *HttpBase) HttpPost(endPoint string, payload []byte, headers map[string]string) (HttpResult, error) {
ret := HttpResult{}
param := bytes.NewBuffer([]byte(payload))
req, err := http.NewRequest("POST", endPoint, param)
if len(headers) > 0 {
for hKey, hValue := range headers {
req.Header.Add(hKey, hValue)
}
}
response, err := client.Do(req)
if err != nil && response == nil {
return ret, err
}
defer response.Body.Close()

body, err := ioutil.ReadAll(response.Body)
if err != nil {
	return ret, err
}
ret.HttpCode = response.StatusCode
ret.Body = string(body)
return ret, nil

}

What did you expect to see?

no errors

What did you see instead?

goroutine 48692 [IO wait]:
internal/poll.runtime_pollWait(0x7f8201d94428, 0x72, 0xc424038760)
/usr/local/go/src/runtime/netpoll.go:173 +0x57
internal/poll.(*pollDesc).wait(0xc422b2cc18, 0x72, 0xffffffffffffff00, 0xaf99e0, 0xe0d2b0)
/usr/local/go/src/internal/poll/fd_poll_runtime.go:85 +0x9b
internal/poll.(*pollDesc).waitRead(0xc422b2cc18, 0xc4260a5400, 0x400, 0x400)
/usr/local/go/src/internal/poll/fd_poll_runtime.go:90 +0x3d
internal/poll.(*FD).Read(0xc422b2cc00, 0xc4260a5400, 0x400, 0x400, 0x0, 0x0, 0x0)
/usr/local/go/src/internal/poll/fd_unix.go:157 +0x17d
net.(*netFD).Read(0xc422b2cc00, 0xc4260a5400, 0x400, 0x400, 0xc424038ef8, 0xc424038ef8, 0xc421c97f60)
/usr/local/go/src/net/fd_unix.go:202 +0x4f
net.(*conn).Read(0xc427618d48, 0xc4260a5400, 0x400, 0x400, 0x0, 0x0, 0x0)
/usr/local/go/src/net/net.go:176 +0x6a
crypto/tls.(*block).readFromUntil(0xc424935470, 0x7f8202254208, 0xc427618d48, 0x5, 0xc427618d48, 0xc423910600)
/usr/local/go/src/crypto/tls/conn.go:493 +0x96
crypto/tls.(*Conn).readRecord(0xc42826a700, 0xab1317, 0xc42826a820, 0x453dd0)
/usr/local/go/src/crypto/tls/conn.go:595 +0xe0
crypto/tls.(*Conn).Read(0xc42826a700, 0xc42ba7b000, 0x1000, 0x1000, 0x0, 0x0, 0x0)
/usr/local/go/src/crypto/tls/conn.go:1156 +0x100
net/http.(*persistConn).Read(0xc42a308900, 0xc42ba7b000, 0x1000, 0x1000, 0xc424038b98, 0x403365, 0xc42bed3aa0)
/usr/local/go/src/net/http/transport.go:1453 +0x136
bufio.(*Reader).fill(0xc42326a420)
/usr/local/go/src/bufio/bufio.go:100 +0x11e
bufio.(*Reader).Peek(0xc42326a420, 0x1, 0x0, 0x0, 0x0, 0xc4232b0e40, 0x0)
/usr/local/go/src/bufio/bufio.go:132 +0x3a
net/http.(*persistConn).readLoop(0xc42a308900)
/usr/local/go/src/net/http/transport.go:1601 +0x185
internal/poll.(*FD).Read(0xc425803a80, 0xc4240f9000, 0x1000, 0x1000, 0x0, 0x0, 0x0)
/usr/local/go/src/internal/poll/fd_unix.go:157 +0x17d
net.(*netFD).Read(0xc425803a80, 0xc4240f9000, 0x1000, 0x1000, 0x453dd0, 0xc421bf1680, 0x4)
/usr/local/go/src/net/fd_unix.go:202 +0x4f
net.(*conn).Read(0xc4226bee50, 0xc4240f9000, 0x1000, 0x1000, 0x0, 0x0, 0x0)
/usr/local/go/src/net/net.go:176 +0x6a
net/http.(*persistConn).Read(0xc42236b200, 0xc4240f9000, 0x1000, 0x1000, 0xc421dceb98, 0x403365, 0xc423ba9860)
/usr/local/go/src/net/http/transport.go:1453 +0x136
bufio.(*Reader).fill(0xc4276437a0)
/usr/local/go/src/bufio/bufio.go:100 +0x11e
bufio.(*Reader).Peek(0xc4276437a0, 0x1, 0x0, 0x0, 0x0, 0xc4238e1560, 0x0)
/usr/local/go/src/bufio/bufio.go:132 +0x3a
net/http.(*persistConn).readLoop(0xc42236b200)
/usr/local/go/src/net/http/transport.go:1601 +0x185
created by net/http.(*Transport).dialConn
/usr/local/go/src/net/http/transport.go:1237 +0x95a

goroutine 49463 [IO wait]:
internal/poll.runtime_pollWait(0x7f8201ccf9e0, 0x72, 0xc428c379a8)
/usr/local/go/src/runtime/netpoll.go:173 +0x57
internal/poll.(*pollDesc).wait(0xc42003f718, 0x72, 0xffffffffffffff00, 0xaf99e0, 0xe0d2b0)
/usr/local/go/src/internal/poll/fd_poll_runtime.go:85 +0x9b
internal/poll.(*pollDesc).waitRead(0xc42003f718, 0xc4280c0000, 0x1000, 0x1000)
/usr/local/go/src/internal/poll/fd_poll_runtime.go:90 +0x3d
internal/poll.(*FD).Read(0xc42003f700, 0xc4280c0000, 0x1000, 0x1000, 0x0, 0x0, 0x0)
/usr/local/go/src/internal/poll/fd_unix.go:157 +0x17d
net.(*netFD).Read(0xc42003f700, 0xc4280c0000, 0x1000, 0x1000, 0x453dd0, 0xc421e18780, 0x4)
/usr/local/go/src/net/fd_unix.go:202 +0x4f
net.(*conn).Read(0xc4239fc770, 0xc4280c0000, 0x1000, 0x1000, 0x0, 0x0, 0x0)
/usr/local/go/src/net/net.go:176 +0x6a
net/http.(*persistConn).Read(0xc4246feb40, 0xc4280c0000, 0x1000, 0x1000, 0xc428c37b98, 0x403365, 0xc422fa7bc0)
/usr/local/go/src/net/http/transport.go:1453 +0x136
bufio.(*Reader).fill(0xc424eb28a0)
/usr/local/go/src/bufio/bufio.go:100 +0x11e
bufio.(*Reader).Peek(0xc424eb28a0, 0x1, 0x0, 0x0, 0x0, 0xc428c8e600, 0x0)
/usr/local/go/src/bufio/bufio.go:132 +0x3a
net/http.(*persistConn).readLoop(0xc4246feb40)
/usr/local/go/src/net/http/transport.go:1601 +0x185
created by net/http.(*Transport).dialConn
/usr/local/go/src/net/http/transport.go:1237 +0x95a