diff --git a/cmd/go-portScan.go b/cmd/go-portScan.go
index 309e7ce..aaf13da 100644
--- a/cmd/go-portScan.go
+++ b/cmd/go-portScan.go
@@ -32,6 +32,7 @@ var (
 	iL      string
 	devices bool
 	dev     string
+	httpx   bool
 )
 
 func parseFlag(c *cli.Context) {
@@ -46,6 +47,7 @@ func parseFlag(c *cli.Context) {
 	sT = c.Bool("sT")
 	sV = c.Bool("sV")
 	timeout = c.Int("timeout")
+	httpx = c.Bool("httpx")
 }
 
 func run(c *cli.Context) error {
@@ -113,10 +115,32 @@ func run(c *cli.Context) error {
 	single := make(chan struct{})
 	retChan := make(chan port.OpenIpPort, 65535)
 	// port fingerprint
+	var httpxFile *os.File
+	var httpxFileLooker sync.Mutex
+	if httpx {
+		httpxFile, err = os.OpenFile("httpInfo.txt", os.O_APPEND|os.O_CREATE, 0644)
+		if err == nil {
+			defer httpxFile.Close()
+		}
+	}
 	var wgPortIdentify sync.WaitGroup
 	poolPortIdentify, _ := ants.NewPoolWithFunc(500, func(ipPort interface{}) {
 		ret := ipPort.(port.OpenIpPort)
-		fmt.Printf("%s:%d %s\n", ret.Ip, ret.Port, fingerprint.PortIdentify("tcp", ret.Ip, ret.Port))
+		if httpx {
+			_buf := fingerprint.ProbeHttpInfo(ret.Ip, ret.Port)
+			if _buf != nil {
+				buf := fmt.Sprintf("[HttpInfo]%s\n", _buf)
+				if httpxFile != nil {
+					httpxFileLooker.Lock()
+					httpxFile.WriteString(buf)
+					httpxFileLooker.Unlock()
+				}
+				fmt.Print(buf)
+			}
+		} else {
+			fmt.Printf("%s:%d %s\n", ret.Ip, ret.Port, fingerprint.PortIdentify("tcp", ret.Ip, ret.Port))
+		}
+
 		wgPortIdentify.Done()
 	})
 	defer poolPortIdentify.Release()
@@ -128,11 +152,12 @@ func run(c *cli.Context) error {
 					single <- struct{}{}
 					return
 				}
-				if sV {
+				if sV || httpx {
 					// port fingerprint
 					wgPortIdentify.Add(1)
 					poolPortIdentify.Invoke(ret)
-				} else {
+				}
+				if !sV {
 					fmt.Printf("%v:%d\n", ret.Ip, ret.Port)
 				}
 			default:
@@ -310,6 +335,11 @@ func main() {
 				Usage: "port service identify",
 				Value: false,
 			},
+			&cli.BoolFlag{
+				Name:  "httpx",
+				Usage: "http server identify",
+				Value: false,
+			},
 		},
 	}
 
diff --git a/core/port/fingerprint/encodings.go b/core/port/fingerprint/encodings.go
new file mode 100644
index 0000000..579f64f
--- /dev/null
+++ b/core/port/fingerprint/encodings.go
@@ -0,0 +1,88 @@
+package fingerprint
+
+import (
+	"bytes"
+	"io/ioutil"
+	"net/http"
+	"strings"
+
+	"github.com/projectdiscovery/stringsutil"
+	"golang.org/x/text/encoding/korean"
+	"golang.org/x/text/encoding/simplifiedchinese"
+	"golang.org/x/text/encoding/traditionalchinese"
+	"golang.org/x/text/transform"
+)
+
+// Credits: https://gist.github.com/zhangbaohe/c691e1da5bbdc7f41ca5
+
+// Decodegbk converts GBK to UTF-8
+func Decodegbk(s []byte) ([]byte, error) {
+	I := bytes.NewReader(s)
+	O := transform.NewReader(I, simplifiedchinese.GBK.NewDecoder())
+	d, e := ioutil.ReadAll(O)
+	if e != nil {
+		return nil, e
+	}
+	return d, nil
+}
+
+// Decodebig5 converts BIG5 to UTF-8
+func Decodebig5(s []byte) ([]byte, error) {
+	I := bytes.NewReader(s)
+	O := transform.NewReader(I, traditionalchinese.Big5.NewDecoder())
+	d, e := ioutil.ReadAll(O)
+	if e != nil {
+		return nil, e
+	}
+	return d, nil
+}
+
+// Encodebig5 converts UTF-8 to BIG5
+func Encodebig5(s []byte) ([]byte, error) {
+	I := bytes.NewReader(s)
+	O := transform.NewReader(I, traditionalchinese.Big5.NewEncoder())
+	d, e := ioutil.ReadAll(O)
+	if e != nil {
+		return nil, e
+	}
+	return d, nil
+}
+
+func DecodeKorean(s []byte) ([]byte, error) {
+	koreanDecoder := korean.EUCKR.NewDecoder()
+	return koreanDecoder.Bytes(s)
+}
+
+// ExtractTitle from a response
+func DecodeData(data []byte, headers http.Header) ([]byte, error) {
+	// Non UTF-8
+	if contentTypes, ok := headers["Content-Type"]; ok {
+		contentType := strings.ToLower(strings.Join(contentTypes, ";"))
+
+		switch {
+		case stringsutil.ContainsAny(contentType, "charset=gb2312", "charset=gbk"):
+			return Decodegbk([]byte(data))
+		case stringsutil.ContainsAny(contentType, "euc-kr"):
+			return DecodeKorean(data)
+		}
+
+		// Content-Type from head tag
+		var match = reContentType.FindSubmatch(data)
+		var mcontentType = ""
+		if len(match) != 0 {
+			for i, v := range match {
+				if string(v) != "" && i != 0 {
+					mcontentType = string(v)
+				}
+			}
+			mcontentType = strings.ToLower(mcontentType)
+		}
+		switch {
+		case stringsutil.ContainsAny(mcontentType, "gb2312", "gbk"):
+			return Decodegbk(data)
+		}
+	}
+
+	// return as is
+	return data, nil
+}
diff --git a/core/port/fingerprint/http.go b/core/port/fingerprint/http.go
new file mode 100644
index 0000000..170032e
--- /dev/null
+++ b/core/port/fingerprint/http.go
@@ -0,0 +1,95 @@
+package fingerprint
+
+import (
+	"compress/flate"
+	"compress/gzip"
+	"crypto/tls"
+	"errors"
+	"io"
+	"net"
+	"net/http"
+	"time"
+)
+
+var ErrOverflow = errors.New("OverflowMax")
+
+type Options struct {
+}
+
+func newHttpClient() *http.Client {
+	transport := &http.Transport{
+		TLSClientConfig: &tls.Config{
+			InsecureSkipVerify: true,
+		},
+		DialContext: (&net.Dialer{
+			Timeout: 5 * time.Second,
+		}).DialContext,
+		MaxIdleConnsPerHost:   1,
+		IdleConnTimeout:       100 * time.Millisecond,
+		TLSHandshakeTimeout:   3 * time.Second,
+		ExpectContinueTimeout: 3 * time.Second,
+		DisableKeepAlives:     true,
+		ForceAttemptHTTP2:     false,
+	}
+
+	// proxy
+	//if options.ProxyUrl != "" {
+	//	proxyUrl, err := url.Parse(options.ProxyUrl)
+	//	if err != nil {
+	//		log.Fatalln(err)
+	//	}
+	//	transport.Proxy = http.ProxyURL(proxyUrl)
+	//}
+
+	return &http.Client{
+		Timeout:   3 * time.Second,
+		Transport: transport,
+		CheckRedirect: func(req *http.Request, via []*http.Request) error {
+			return http.ErrUseLastResponse /* 不进入重定向 */
+		},
+	}
+}
+
+// getBody 识别响应Body的编码，读取body数据
+func getBody(resp *http.Response) (body []byte, err error) {
+	if resp.Body == nil || resp.Body == http.NoBody {
+		return
+	}
+	var reader io.Reader
+	switch resp.Header.Get("Content-Encoding") {
+	case "gzip":
+		reader, err = gzip.NewReader(resp.Body)
+	case "deflate":
+		reader = flate.NewReader(resp.Body)
+	//case "br":
+	//	reader = brotli.NewReader(resp.Body)
+	default:
+		reader = resp.Body
+	}
+	if err == nil {
+		body, err = readMaxSize(reader, 300*1024) // Max Size 300kb
+	}
+	return
+}
+
+// readMaxSize 读取io数据，限制最大读取尺寸
+func readMaxSize(r io.Reader, maxsize int) ([]byte, error) {
+	b := make([]byte, 0, 512)
+	for {
+		if len(b) >= maxsize {
+			return b, ErrOverflow
+		}
+		if len(b) == cap(b) {
+			// Add more capacity (let append pick how much).
+			b = append(b, 0)[:len(b)]
+		}
+		n, err := r.Read(b[len(b):cap(b)])
+		b = b[:len(b)+n]
+		if err != nil {
+			if err == io.EOF {
+				err = nil
+			}
+			return b, err
+		}
+	}
+}
diff --git a/core/port/fingerprint/httpInfo.go b/core/port/fingerprint/httpInfo.go
new file mode 100644
index 0000000..2aab11b
--- /dev/null
+++ b/core/port/fingerprint/httpInfo.go
@@ -0,0 +1,108 @@
+package fingerprint
+
+import (
+	"fmt"
+	"github.com/XinRoom/go-portScan/util"
+	"net"
+	"net/http"
+	"strings"
+)
+
+// HttpInfo Http服务基础信息
+type HttpInfo struct {
+	StatusCode int      // 状态码
+	ContentLen int      // 相应包大小
+	Url        string   // Url
+	Location   string   // 302、301重定向路径
+	Title      string   // 标题
+	TlsCN      string   // tls使用者名称
+	TlsDNS     []string // tlsDNS列表
+}
+
+var httpsTopPort = []uint16{443, 4443, 1443, 8443}
+
+var httpClient *http.Client
+
+func (hi *HttpInfo) String() string {
+	if hi == nil {
+		return ""
+	}
+	var buf strings.Builder
+	buf.WriteString(fmt.Sprintf("Url:%s StatusCode:%d ContentLen:%d Title:%s ", hi.Url, hi.StatusCode, hi.ContentLen, hi.Title))
+	if hi.Location != "" {
+		buf.WriteString("Location:" + hi.Location + " ")
+	}
+	if hi.TlsCN != "" {
+		buf.WriteString("TlsCN:" + hi.TlsCN + " ")
+	}
+	if len(hi.TlsDNS) > 0 {
+		buf.WriteString("TlsDNS:" + strings.Join(hi.TlsDNS, ",") + " ")
+	}
+	return buf.String()
+}
+
+func ProbeHttpInfo(ip net.IP, _port uint16) *HttpInfo {
+
+	if httpClient == nil {
+		httpClient = newHttpClient()
+	}
+
+	var err error
+	var rewriteUrl string
+	var body []byte
+	var _body []byte
+	var resp *http.Response
+	var schemes []string
+	var httpInfo *HttpInfo
+
+	if util.IsUint16InList(_port, httpsTopPort) {
+		schemes = []string{"https", "http"}
+	} else {
+		schemes = []string{"http", "https"}
+	}
+
+	for _, scheme := range schemes {
+		req, _ := http.NewRequest(http.MethodGet, fmt.Sprintf("%s://%s:%d/", scheme, ip.String(), _port), http.NoBody)
+		req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36")
+		req.Header.Set("Accept-Encoding", "gzip, deflate")
+		req.Close = true // disable keepalive
+		resp, err = httpClient.Do(req)
+		if err != nil {
+			continue
+		}
+		if resp.Body != http.NoBody && resp.Body != nil {
+			body, _ = getBody(resp)
+			_body, err = DecodeData(body, resp.Header)
+			if err == nil {
+				body = _body
+			}
+			if resp.ContentLength == -1 {
+				resp.ContentLength = int64(len(body))
+			}
+			rewriteUrl2, _ := resp.Location()
+			if rewriteUrl2 != nil {
+				rewriteUrl = rewriteUrl2.String()
+			} else {
+				rewriteUrl = ""
+			}
+			location := GetLocation(body)
+			if rewriteUrl == "" && location != "" {
+				rewriteUrl = location
+			}
+			//
+			httpInfo = new(HttpInfo)
+			httpInfo.Url = resp.Request.URL.String()
+			httpInfo.StatusCode = resp.StatusCode
+			httpInfo.ContentLen = int(resp.ContentLength)
+			httpInfo.Location = rewriteUrl
+			httpInfo.Title = ExtractTitle(body)
+			if resp.TLS != nil && len(resp.TLS.PeerCertificates) > 0 {
+				httpInfo.TlsCN = resp.TLS.PeerCertificates[0].Subject.CommonName
+				httpInfo.TlsDNS = resp.TLS.PeerCertificates[0].DNSNames
+			}
+			break
+		}
+	}
+
+	return httpInfo
+}
diff --git a/core/port/fingerprint/httpInfo_test.go b/core/port/fingerprint/httpInfo_test.go
new file mode 100644
index 0000000..bb34185
--- /dev/null
+++ b/core/port/fingerprint/httpInfo_test.go
@@ -0,0 +1,10 @@
+package fingerprint
+
+import (
+	"net"
+	"testing"
+)
+
+func TestName(t *testing.T) {
+	t.Log(ProbeHttpInfo(net.ParseIP("14.215.177.39"), 443))
+}
diff --git a/core/port/fingerprint/title.go b/core/port/fingerprint/title.go
new file mode 100644
index 0000000..0dddad7
--- /dev/null
+++ b/core/port/fingerprint/title.go
@@ -0,0 +1,96 @@
+package fingerprint
+
+import (
+	"bytes"
+	"fmt"
+	"golang.org/x/net/html"
+	"io"
+	"regexp"
+	"strings"
+)
+
+var (
+	cutset        = "\n\t\v\f\r"
+	reTitle       = regexp.MustCompile(`(?im)<\s*title.*>(.*?)<\s*/\s*title>`)
+	reContentType = regexp.MustCompile(`(?im)\s*charset="(.*?)"|charset=(.*?)"\s*`)
+	reRefresh     = regexp.MustCompile(`(?im)\s*content=['"]\d;url=(.*?)['"]`)
+	reReplace     = regexp.MustCompile(`(?im)window\.location\.replace\(['"](.*?)['"]\)`)
+)
+
+// ExtractTitle from a response
+func ExtractTitle(body []byte) (title string) {
+	// Try to parse the DOM
+	titleDom, err := getTitleWithDom(body)
+	// In case of error fallback to regex
+	if err != nil {
+		for _, match := range reTitle.FindAllString(string(body), -1) {
+			title = match
+			break
+		}
+	} else {
+		title = renderNode(titleDom)
+	}
+
+	title = html.UnescapeString(trimTitleTags(title))
+
+	// remove unwanted chars
+	title = strings.TrimSpace(strings.Trim(title, cutset))
+	title = strings.ReplaceAll(title, "\n", "")
+	title = strings.ReplaceAll(title, "\r", "")
+
+	return title
+}
+
+func getTitleWithDom(body []byte) (*html.Node, error) {
+	var title *html.Node
+	var crawler func(*html.Node)
+	crawler = func(node *html.Node) {
+		if node.Type == html.ElementNode && node.Data == "title" {
+			title = node
+			return
+		}
+		for child := node.FirstChild; child != nil && title == nil; child = child.NextSibling {
+			crawler(child)
+		}
+	}
+	htmlDoc, err := html.Parse(bytes.NewReader(body))
+	if err != nil {
+		return nil, err
+	}
+	crawler(htmlDoc)
+	if title != nil {
+		return title, nil
+	}
+	return nil, fmt.Errorf("title not found")
+}
+
+func renderNode(n *html.Node) string {
+	var buf bytes.Buffer
+	w := io.Writer(&buf)
+	html.Render(w, n) //nolint
+	return buf.String()
+}
+
+func trimTitleTags(title string) string {
+	// trim <title>*</title>
+	titleBegin := strings.Index(title, ">")
+	titleEnd := strings.Index(title, "</")
+	if titleEnd < 0 || titleBegin < 0 {
+		return title
+	}
+	return title[titleBegin+1 : titleEnd]
+}
+
+func GetLocation(body []byte) (location string) {
+	for _, match := range reRefresh.FindAllStringSubmatch(string(body), 1) {
+		location = match[1]
+		break
+	}
+	if location == "" {
+		for _, match := range reReplace.FindAllStringSubmatch(string(body), 1) {
+			location = match[1]
+			break
+		}
+	}
+	return
+}
diff --git a/go.mod b/go.mod
index 967a03c..7b6a439 100644
--- a/go.mod
+++ b/go.mod
@@ -9,15 +9,21 @@ require (
 	github.com/jackpal/gateway v1.0.7
 	github.com/libp2p/go-netroute v0.2.0
 	github.com/panjf2000/ants/v2 v2.5.0
+	github.com/projectdiscovery/stringsutil v0.0.0-20220712170325-48c50c332cb4
 	github.com/urfave/cli/v2 v2.6.0
+	golang.org/x/net v0.0.0-20220425223048-2871e0cb64e4
+	golang.org/x/text v0.3.7
 	golang.org/x/time v0.0.0-20220411224347-583f2d630306
 )
 
 require (
+	github.com/aymerick/douceur v0.2.0 // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
 	github.com/google/uuid v1.3.0 // indirect
+	github.com/gorilla/css v1.0.0 // indirect
+	github.com/microcosm-cc/bluemonday v1.0.19 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
-	golang.org/x/net v0.0.0-20220425223048-2871e0cb64e4 // indirect
+	github.com/saintfish/chardet v0.0.0-20120816061221-3af4cd4741ca // indirect
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
 	golang.org/x/sys v0.0.0-20220503163025-988cb79eb6c6 // indirect
 )
diff --git a/go.sum b/go.sum
index 1f237b8..aa8ed4d 100644
--- a/go.sum
+++ b/go.sum
@@ -1,7 +1,8 @@
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/toml v1.1.0/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
 github.com/XinRoom/iprange v1.1.1 h1:mcpn1YIYQzWceVJImL2Idvi9/f5jE+tt70aVQ9gxVJo=
 github.com/XinRoom/iprange v1.1.1/go.mod h1:Q5oo7bnEdIYQ8wl5tUyx9x/KdpAJUk+nGw+6TAoxl/0=
-github.com/cpuguy83/go-md2man/v2 v2.0.1 h1:r/myEWzV9lfsM1tFLgDyu0atFtJ1fXn261LKYj/3DxU=
+github.com/aymerick/douceur v0.2.0 h1:Mv+mAeH1Q+n9Fr+oyamOlAkUNPWPlA8PPGR0QAaYuPk=
+github.com/aymerick/douceur v0.2.0/go.mod h1:wlT5vV2O3h55X9m7iVYN0TBM0NH/MmbLnd30/FjWUq4=
 github.com/cpuguy83/go-md2man/v2 v2.0.1/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/cpuguy83/go-md2man/v2 v2.0.2 h1:p1EgwI/C7NhT0JmVkwCD2ZBK8j4aeHQX2pMHHBfMQ6w=
 github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
@@ -15,25 +16,29 @@ github.com/google/gopacket v1.1.19/go.mod h1:iJ8V8n6KS+z2U1A8pUwu8bW5SyEMkXJB8Yo
 github.com/google/uuid v1.2.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
 github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/gorilla/css v1.0.0 h1:BQqNyPTi50JCFMTw/b67hByjMVXZRwGha6wxVGkeihY=
+github.com/gorilla/css v1.0.0/go.mod h1:Dn721qIggHpt4+EFCcTLTU/vk5ySda2ReITrtgBl60c=
 github.com/jackpal/gateway v1.0.7 h1:7tIFeCGmpyrMx9qvT0EgYUi7cxVW48a0mMvnIL17bPM=
 github.com/jackpal/gateway v1.0.7/go.mod h1:aRcO0UFKt+MgIZmRmvOmnejdDT4Y1DNiNOsSd1AcIbA=
 github.com/libp2p/go-netroute v0.2.0 h1:0FpsbsvuSnAhXFnCY0VLFbJOzaK0VnP0r1QT/o4nWRE=
 github.com/libp2p/go-netroute v0.2.0/go.mod h1:Vio7LTzZ+6hoT4CMZi5/6CpY3Snzh2vgZhWgxMNwlQI=
-github.com/panjf2000/ants/v2 v2.4.8 h1:JgTbolX6K6RreZ4+bfctI0Ifs+3mrE5BIHudQxUDQ9k=
-github.com/panjf2000/ants/v2 v2.4.8/go.mod h1:f6F0NZVFsGCp5A7QW/Zj/m92atWwOkY0OIhFxRNFr4A=
+github.com/microcosm-cc/bluemonday v1.0.19 h1:OI7hoF5FY4pFz2VA//RN8TfM0YJ2dJcl4P4APrCWy6c=
+github.com/microcosm-cc/bluemonday v1.0.19/go.mod h1:QNzV2UbLK2/53oIIwTOyLUSABMkjZ4tqiyC1g/DyqxE=
 github.com/panjf2000/ants/v2 v2.5.0 h1:1rWGWSnxCsQBga+nQbA4/iY6VMeNoOIAM0ZWh9u3q2Q=
 github.com/panjf2000/ants/v2 v2.5.0/go.mod h1:cU93usDlihJZ5CfRGNDYsiBYvoilLvBF5Qp/BT2GNRE=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/projectdiscovery/stringsutil v0.0.0-20220712170325-48c50c332cb4 h1:vm7ckAKkqFkJfh2+yYYW/Xr+GS2prGpQ4JlbwKkf4lU=
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 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
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+github.com/saintfish/chardet v0.0.0-20120816061221-3af4cd4741ca/go.mod h1:uugorj2VCxiV1x+LzaIdVa9b4S4qGAcH6cbhh4qVxOU=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
-github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
-github.com/urfave/cli/v2 v2.4.0 h1:m2pxjjDFgDxSPtO8WSdbndj17Wu2y8vOT86wE/tjr+I=
-github.com/urfave/cli/v2 v2.4.0/go.mod h1:NX9W0zmTvedE5oDoOMs2RTC8RvdK98NTYZE5LbaEYPg=
-github.com/urfave/cli/v2 v2.5.0 h1:2sqblaW62ebcTIEvwb8eRvDfNHeBAeKxfhdynaanhug=
-github.com/urfave/cli/v2 v2.5.0/go.mod h1:oDzoM7pVwz6wHn5ogWgFUU1s4VJayeQS+aEZDqXIEJs=
+github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.0 h1:pSgiaMZlXftHpm5L7V1+rVB+AZJydKsMxsQBIJw4PKk=
+github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/urfave/cli/v2 v2.6.0 h1:yj2Drkflh8X/zUrkWlWlUjZYHyWN7WMmpVxyxXIUyv8=
 github.com/urfave/cli/v2 v2.6.0/go.mod h1:oDzoM7pVwz6wHn5ogWgFUU1s4VJayeQS+aEZDqXIEJs=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
@@ -44,8 +49,7 @@ golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4/go.mod h1:RBQZq4jEuRlivfhVLdyRGr576XBO4/greRjx4P4O3yc=
 golang.org/x/net v0.0.0-20210423184538-5f58ad60dda6/go.mod h1:OJAsFXCWl8Ukc7SiCT/9KSuxbyM7479/AVlXFRxuMCk=
-golang.org/x/net v0.0.0-20220412020605-290c469a71a5 h1:bRb386wvrE+oBNdF1d/Xh9mQrfQ4ecYhW5qJ5GvTGT4=
-golang.org/x/net v0.0.0-20220412020605-290c469a71a5/go.mod h1:CfG3xpIq0wQ8r1q4Su4UZFWDARRcnwPjda9FqA0JpMk=
+golang.org/x/net v0.0.0-20210614182718-04defd469f4e/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.0.0-20220425223048-2871e0cb64e4 h1:HVyaeDAYux4pnY+D/SiwmLOR36ewZ4iGQIIrtnuCjFA=
 golang.org/x/net v0.0.0-20220425223048-2871e0cb64e4/go.mod h1:CfG3xpIq0wQ8r1q4Su4UZFWDARRcnwPjda9FqA0JpMk=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -59,10 +63,6 @@ golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210426080607-c94f62235c83/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220412211240-33da011f77ad h1:ntjMns5wyP/fN65tdBD4g8J5w8n015+iIIs9rtjXkY0=
-golang.org/x/sys v0.0.0-20220412211240-33da011f77ad/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220422013727-9388b58f7150 h1:xHms4gcpe1YE7A3yIllJXP16CMAGuqwO2lX1mTyyRRc=
-golang.org/x/sys v0.0.0-20220422013727-9388b58f7150/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220503163025-988cb79eb6c6 h1:nonptSpoQ4vQjyraW20DXPAglgQfVnM9ZC6MmNLMR60=
 golang.org/x/sys v0.0.0-20220503163025-988cb79eb6c6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
@@ -70,6 +70,7 @@ golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuX
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7 h1:olpwvP2KacW1ZWvsR7uQhoyTYvKAupfQrRGBFM352Gk=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/time v0.0.0-20220411224347-583f2d630306 h1:+gHMid33q6pen7kv9xvT+JRinntgeXO2AeZVd0AWD3w=
 golang.org/x/time v0.0.0-20220411224347-583f2d630306/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
@@ -77,7 +78,8 @@ golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGm
 golang.org/x/tools v0.0.0-20200130002326-2f3ba24bd6e7/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
-gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/util/shuffle.go b/util/shuffle.go
index 21977d3..f98bb02 100644
--- a/util/shuffle.go
+++ b/util/shuffle.go
@@ -55,3 +55,12 @@ func (sf *Shuffle) Get(index uint64) uint64 {
 	}
 	return index - t + uint64(sf.rl[uint16(t)])
 }
+
+func IsUint16InList(code uint16, list []uint16) bool {
+	for _, e := range list {
+		if e == code {
+			return true
+		}
+	}
+	return false
+}