diff --git a/download/common/constants.go b/download/common/constants.go
new file mode 100644
index 00000000..ef11227b
--- /dev/null
+++ b/download/common/constants.go
@@ -0,0 +1,23 @@
+package common
+
+type Status int
+
+const (
+	DownloadStatusReady Status = iota
+	DownloadStatusStart
+	DownloadStatusPause
+	DownloadStatusError
+	DownloadStatusDone
+)
+
+const (
+	HttpCodeOK             = 200
+	HttpCodePartialContent = 206
+
+	HttpHeaderRange              = "Range"
+	HttpHeaderContentLength      = "Content-Length"
+	HttpHeaderContentRange       = "Content-Range"
+	HttpHeaderContentDisposition = "Content-Disposition"
+
+	HttpHeaderRangeFormat = "bytes=%d-%d"
+)
diff --git a/download/common/controller.go b/download/common/controller.go
new file mode 100644
index 00000000..fe3e3d75
--- /dev/null
+++ b/download/common/controller.go
@@ -0,0 +1,129 @@
+package common
+
+import (
+	"golang.org/x/net/proxy"
+	"net"
+	"os"
+	"time"
+)
+
+// 下载请求
+type Request struct {
+	// 下载链接
+	URL string
+	// 附加信息
+	Extra interface{}
+}
+
+// 资源信息
+type Resource struct {
+	Req *Request
+	// 资源总大小
+	Size int64
+	// 是否支持断点下载
+	Range bool
+	// 资源所包含的文件列表
+	Files []*FileInfo
+}
+
+type Options struct {
+	// 保存文件名
+	Name string
+	// 保存目录
+	Path string
+	// 并发连接数
+	Connections int
+}
+
+type FileInfo struct {
+	Name       string
+	Path       string
+	Size       int64
+	Downloaded int64
+}
+
+type Process interface {
+	Start() error
+	Pause() error
+	Continue() error
+	Delete() error
+}
+
+type Controller struct {
+	Files map[string]*os.File
+}
+
+func (c *Controller) Touch(name string, size int64) error {
+	if size > 0 {
+		return os.Truncate(name, size)
+	}
+	_, err := os.Create(name)
+	return err
+}
+
+func (c *Controller) Write(name string, offset int64, buf []byte) (int, error) {
+	file, ok := c.Files[name]
+	if !ok {
+		var err error
+		file, err = os.OpenFile(name, os.O_RDWR, 0666)
+		if err != nil {
+			return 0, err
+		}
+		c.Files[name] = file
+	}
+	return file.WriteAt(buf, offset)
+}
+
+func (c *Controller) ContextDialer() (proxy.Dialer, error) {
+	// return proxy.SOCKS5("tpc", "127.0.0.1:9999", nil, nil)
+	var dialer proxy.Dialer
+	return &DialerWarp{dialer: dialer}, nil
+}
+
+type DialerWarp struct {
+	dialer proxy.Dialer
+}
+
+type ConnWarp struct {
+	conn net.Conn
+}
+
+func (c *ConnWarp) Read(b []byte) (n int, err error) {
+	return c.conn.Read(b)
+}
+
+func (c *ConnWarp) Write(b []byte) (n int, err error) {
+	return c.conn.Write(b)
+}
+
+func (c *ConnWarp) Close() error {
+	return c.conn.Close()
+}
+
+func (c *ConnWarp) LocalAddr() net.Addr {
+	return c.conn.LocalAddr()
+}
+
+func (c *ConnWarp) RemoteAddr() net.Addr {
+	return c.conn.RemoteAddr()
+}
+
+func (c *ConnWarp) SetDeadline(t time.Time) error {
+	return c.conn.SetDeadline(t)
+}
+
+func (c *ConnWarp) SetReadDeadline(t time.Time) error {
+	return c.conn.SetReadDeadline(t)
+}
+
+func (c *ConnWarp) SetWriteDeadline(t time.Time) error {
+	return c.conn.SetWriteDeadline(t)
+}
+
+func (d *DialerWarp) Dial(network, addr string) (c net.Conn, err error) {
+	conn, err := d.dialer.Dial(network, addr)
+	if err != nil {
+		return nil, err
+	}
+	return &ConnWarp{conn: conn}, nil
+}
diff --git a/download/common/fetcher.go b/download/common/fetcher.go
new file mode 100644
index 00000000..038228b0
--- /dev/null
+++ b/download/common/fetcher.go
@@ -0,0 +1,29 @@
+package common
+
+// 对应协议的下载支持
+type Fetcher interface {
+	BaseFetch
+	// 支持的协议列表
+	Protocols() []string
+	// 解析请求
+	Resolve(req *Request) (*Resource, error)
+	// 创建任务
+	Create(res *Resource, opts *Options) (Process, error)
+}
+
+type BaseFetch interface {
+	InitCtl(ctl *Controller)
+	GetCtl() *Controller
+}
+
+type BaseFetcher struct {
+	ctl *Controller
+}
+
+func (b *BaseFetcher) InitCtl(ctl *Controller) {
+	b.ctl = ctl
+}
+
+func (b *BaseFetcher) GetCtl() *Controller {
+	return b.ctl
+}
diff --git a/download/downloader.go b/download/downloader.go
new file mode 100644
index 00000000..d6b7a688
--- /dev/null
+++ b/download/downloader.go
@@ -0,0 +1,82 @@
+package download
+
+import (
+	"errors"
+	"github.com/google/uuid"
+	"github.com/monkeyWie/gopeed/download/common"
+	"net/url"
+	"os"
+	"strings"
+)
+
+type TaskInfo struct {
+	ID     string
+	Res    *common.Resource
+	Opts   *common.Options
+	Status common.Status
+	Files  map[string]*common.FileInfo
+
+	process common.Process
+}
+
+type Downloader struct {
+	fetches map[string]common.Fetcher
+	tasks   map[string]*TaskInfo
+	*common.Controller
+}
+
+func NewDownloader(fetchers ...common.Fetcher) *Downloader {
+	d := &Downloader{Controller: &common.Controller{Files: make(map[string]*os.File)}}
+	d.fetches = make(map[string]common.Fetcher)
+	for _, f := range fetchers {
+		for _, p := range f.Protocols() {
+			d.fetches[strings.ToUpper(p)] = f
+		}
+		f.InitCtl(d.Controller)
+	}
+	d.tasks = make(map[string]*TaskInfo)
+	return d
+}
+
+func (d *Downloader) getFetcher(URL string) (common.Fetcher, error) {
+	url, err := url.Parse(URL)
+	if err != nil {
+		return nil, err
+	}
+	if fetch, ok := d.fetches[strings.ToUpper(url.Scheme)]; ok {
+		return fetch, nil
+	}
+	return nil, errors.New("unsupported protocol")
+}
+
+func (d *Downloader) Resolve(req *common.Request) (*common.Resource, error) {
+	fetcher, err := d.getFetcher(req.URL)
+	if err != nil {
+		return nil, err
+	}
+	return fetcher.Resolve(req)
+}
+
+func (d *Downloader) Create(res *common.Resource, opts *common.Options) error {
+	fetcher, err := d.getFetcher(res.Req.URL)
+	if err != nil {
+		return err
+	}
+	process, err := fetcher.Create(res, opts)
+	if err != nil {
+		return err
+	}
+	id := uuid.New().String()
+	d.tasks[id] = &TaskInfo{
+		ID:      id,
+		Res:     res,
+		Opts:    opts,
+		Status:  common.DownloadStatusReady,
+		process: process,
+	}
+	return process.Start()
+}
+
+func (d *Downloader) Pause(id string) {
+	d.tasks[id].process.Pause()
+}
diff --git a/download/downloader_test.go b/download/downloader_test.go
new file mode 100644
index 00000000..51d1ef7f
--- /dev/null
+++ b/download/downloader_test.go
@@ -0,0 +1,40 @@
+package download
+
+import (
+	"fmt"
+	"github.com/monkeyWie/gopeed/download/common"
+	"github.com/monkeyWie/gopeed/download/http"
+	"testing"
+)
+
+func TestDownloader_Resolve(t *testing.T) {
+	downloader := buildDownloader()
+	res, err := downloader.Resolve(&common.Request{
+		URL: "http://192.168.200.163:8088/docker-compose",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	fmt.Println(res)
+}
+
+func TestDownloader_Create(t *testing.T) {
+	downloader := buildDownloader()
+	res, err := downloader.Resolve(&common.Request{
+		URL: "http://192.168.200.163:8088/docker-compose",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = downloader.Create(res, &common.Options{
+		Path:        "E:\\test\\gopeed\\http",
+		Connections: 4,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func buildDownloader() *Downloader {
+	return NewDownloader(&http.Fetcher{BaseFetcher: &common.BaseFetcher{}})
+}
diff --git a/download/http/fetcher.go b/download/http/fetcher.go
new file mode 100644
index 00000000..d84745df
--- /dev/null
+++ b/download/http/fetcher.go
@@ -0,0 +1,148 @@
+package http
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"github.com/monkeyWie/gopeed/download/common"
+	"github.com/monkeyWie/gopeed/download/http/model"
+	"io/ioutil"
+	"mime"
+	"net/http"
+	"net/http/cookiejar"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type Fetcher struct {
+	*common.BaseFetcher
+}
+
+func (h *Fetcher) Protocols() []string {
+	return []string{"HTTP", "HTTPS"}
+}
+
+func (h *Fetcher) Resolve(req *common.Request) (*common.Resource, error) {
+	httpReq, err := BuildRequest(req)
+	if err != nil {
+		return nil, err
+	}
+	client := BuildClient()
+	// 只访问一个字节，测试资源是否支持Range请求
+	httpReq.Header.Set(common.HttpHeaderRange, fmt.Sprintf(common.HttpHeaderRangeFormat, 0, 0))
+	httpResp, err := client.Do(httpReq)
+	if err != nil {
+		return nil, err
+	}
+	defer httpResp.Body.Close()
+	res := &common.Resource{
+		Req:   req,
+		Range: false,
+		Files: []*common.FileInfo{},
+	}
+	if common.HttpCodePartialContent == httpResp.StatusCode {
+		// 返回206响应码表示支持断点下载
+		res.Range = true
+		// 解析资源大小: bytes 0-1000/1001 => 1001
+		contentTotal := subLastSlash(httpResp.Header.Get(common.HttpHeaderContentRange))
+		if contentTotal != "" {
+			parse, err := strconv.ParseInt(contentTotal, 10, 64)
+			if err != nil {
+				return nil, err
+			}
+			res.Size = parse
+		}
+	} else if common.HttpCodeOK == httpResp.StatusCode {
+		// 返回200响应码，不支持断点下载，通过Content-Length头获取文件大小，获取不到的话可能是chunked编码
+		contentLength := httpResp.Header.Get(common.HttpHeaderContentLength)
+		parse, err := strconv.ParseInt(contentLength, 10, 64)
+		if err != nil {
+			return nil, err
+		}
+		res.Size = parse
+	} else {
+		return nil, errors.New("http request fail")
+	}
+	file := &common.FileInfo{
+		Size: res.Size,
+	}
+	contentDisposition := httpResp.Header.Get(common.HttpHeaderContentDisposition)
+	if contentDisposition != "" {
+		_, params, _ := mime.ParseMediaType(contentDisposition)
+		filename := params["filename"]
+		if filename != "" {
+			file.Name = filename
+		}
+	}
+	// Get file name by URL
+	if file.Name == "" {
+		parse, err := url.Parse(req.URL)
+		if err == nil {
+			// e.g. /files/test.txt => test.txt
+			file.Name = subLastSlash(parse.Path)
+		}
+	}
+	// unknown file name
+	if file.Name == "" {
+		file.Name = "unknown"
+	}
+	res.Files = append(res.Files, file)
+	return res, nil
+}
+
+func (h *Fetcher) Create(res *common.Resource, opts *common.Options) (common.Process, error) {
+	if opts.Connections != 1 && !res.Range {
+		opts.Connections = 1
+	}
+	return NewProcess(h, res, opts), nil
+}
+
+func subLastSlash(str string) string {
+	if str == "" {
+		return ""
+	}
+	index := strings.LastIndex(str, "/")
+	if index != -1 {
+		return str[index+1:]
+	}
+	return ""
+}
+
+func BuildClient() *http.Client {
+	// Cookie handle
+	jar, _ := cookiejar.New(nil)
+	return &http.Client{
+		Jar:     jar,
+		Timeout: time.Second * 10,
+	}
+}
+
+func BuildRequest(req *common.Request) (*http.Request, error) {
+	url, err := url.Parse(req.URL)
+	if err != nil {
+		return nil, err
+	}
+	httpReq := &http.Request{
+		URL:    url,
+		Header: map[string][]string{},
+	}
+
+	if req.Extra != nil {
+		if extra, ok := req.Extra.(model.Extra); ok {
+			if extra.Method != "" {
+				httpReq.Method = extra.Method
+			} else {
+				httpReq.Method = http.MethodGet
+			}
+			if len(extra.Header) > 0 {
+				for k, v := range extra.Header {
+					httpReq.Header[k] = []string{v}
+				}
+			}
+			httpReq.Body = ioutil.NopCloser(bytes.NewBufferString(extra.Body))
+		}
+	}
+	return httpReq, nil
+}
diff --git a/download/http/fetcher_test.go b/download/http/fetcher_test.go
new file mode 100644
index 00000000..a05bc86f
--- /dev/null
+++ b/download/http/fetcher_test.go
@@ -0,0 +1,95 @@
+package http
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/monkeyWie/gopeed/download/common"
+	"golang.org/x/net/proxy"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"testing"
+	"time"
+)
+
+func TestFetcher_Resolve(t *testing.T) {
+	fetcher := &Fetcher{}
+	resolve, err := fetcher.Resolve(&common.Request{
+		// URL: "https://github.com/monkeyWie/github-actions-demo/releases/download/v1.0.6/simple-v1.0.6-windows-x64.zip",
+		URL: "http://192.168.200.163:8088/go1.12.7.linux-amd64.tar.gz",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	buf, err := json.Marshal(resolve)
+	if err != nil {
+		t.Fatal(err)
+	}
+	fmt.Printf("%s\n", string(buf))
+}
+
+func Test2(t *testing.T) {
+	socks5, err := proxy.SOCKS5("tcp", "127.0.0.1:1080", nil, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	conn, err := socks5.Dial("tcp", "www.baidu.com:80")
+	if err != nil {
+		t.Fatal(err)
+	}
+	conn.Write([]byte("GET"))
+}
+
+func Test3(t *testing.T) {
+	var u User
+	fmt.Println((&u).Say1())
+	fmt.Println(u.Say2())
+}
+
+func Test4(t *testing.T) {
+	resp, err := http.Get("http://192.168.200.163:8088/go1.12.7.linux-amd64.tar.gz")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer resp.Body.Close()
+	go func() {
+		time.Sleep(time.Second * 3)
+		err2 := resp.Body.Close()
+		if err2 != nil {
+			fmt.Println("close err2:" + err2.Error())
+		}
+	}()
+	_, err = io.Copy(ioutil.Discard, resp.Body)
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func Test5(t *testing.T) {
+	name := "E:\\test\\gopeed\\http\\test.txt"
+	err := os.Truncate(name, 10)
+	if err != nil {
+		t.Fatal(err)
+	}
+	file, err := os.OpenFile(name, os.O_RDWR, 0666)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = file.WriteAt([]byte("test"), 5)
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+type User struct {
+	name string
+}
+
+func (u *User) Say1() string {
+	return "hello1 " + u.name
+}
+
+func (u User) Say2() string {
+	return "hello2 " + u.name
+}
diff --git a/download/http/model/chunk.go b/download/http/model/chunk.go
new file mode 100644
index 00000000..6ae44152
--- /dev/null
+++ b/download/http/model/chunk.go
@@ -0,0 +1,20 @@
+package model
+
+import (
+	common2 "github.com/monkeyWie/gopeed/download/common"
+)
+
+type Chunk struct {
+	Status     common2.Status
+	Begin      int64
+	End        int64
+	Downloaded int64
+}
+
+func NewChunk(begin int64, end int64) *Chunk {
+	return &Chunk{
+		Status: common2.DownloadStatusReady,
+		Begin:  begin,
+		End:    end,
+	}
+}
diff --git a/download/http/model/extra.go b/download/http/model/extra.go
new file mode 100644
index 00000000..48b5c4f1
--- /dev/null
+++ b/download/http/model/extra.go
@@ -0,0 +1,7 @@
+package model
+
+type Extra struct {
+	Method string
+	Header map[string]string
+	Body   string
+}
diff --git a/download/http/process.go b/download/http/process.go
new file mode 100644
index 00000000..6adcb273
--- /dev/null
+++ b/download/http/process.go
@@ -0,0 +1,156 @@
+package http
+
+import (
+	"fmt"
+	"github.com/monkeyWie/gopeed/download/common"
+	"github.com/monkeyWie/gopeed/download/http/model"
+	"io"
+	"net/http"
+	"path/filepath"
+)
+
+type Process struct {
+	fetcher *Fetcher
+
+	res     *common.Resource
+	opts    *common.Options
+	status  common.Status
+	clients []*http.Response
+	chunks  []*model.Chunk
+}
+
+func NewProcess(fetcher *Fetcher, res *common.Resource, opts *common.Options) *Process {
+	return &Process{
+		fetcher: fetcher,
+		res:     res,
+		opts:    opts,
+		status:  common.DownloadStatusReady,
+	}
+}
+
+func (p *Process) Start() error {
+	ctl := p.fetcher.GetCtl()
+	// 创建文件
+	var filename = p.opts.Name
+	if filename == "" {
+		filename = p.res.Files[0].Name
+	}
+	name := filepath.Join(p.opts.Path, filename)
+	err := ctl.Touch(name, p.res.Size)
+	if err != nil {
+		return err
+	}
+	if p.res.Range && p.res.Size > 0 {
+		// 每个连接平均需要下载的分块大小
+		var (
+			chunkSize = p.res.Size / int64(p.opts.Connections)
+			errCh     = make(chan error)
+		)
+		defer close(errCh)
+		p.chunks = make([]*model.Chunk, p.opts.Connections)
+		p.clients = make([]*http.Response, p.opts.Connections)
+		for i := 0; i < p.opts.Connections; i++ {
+			begin := chunkSize * int64(i)
+			end := begin + chunkSize
+			if i == p.opts.Connections-1 {
+				// 最后一个连接下载的分块大小需要特殊计算，保证把文件下载完
+				chunkSize = end + p.res.Size%int64(p.opts.Connections)
+			}
+			p.chunks[i] = model.NewChunk(begin, end)
+			go func(i int) {
+				errCh <- p.doFetch(i, name, begin, end)
+			}(i)
+		}
+		var failErr error
+		for i := 0; i < p.opts.Connections; i++ {
+			err := <-errCh
+			if failErr == nil {
+				// 有一个连接下载失败，立即停止下载
+				failErr = err
+				if failErr != nil {
+					p.Pause()
+				}
+			}
+		}
+		if failErr != nil {
+			return failErr
+		}
+	}
+	return nil
+}
+
+func (p *Process) Pause() error {
+	if len(p.clients) > 0 {
+		for _, client := range p.clients {
+			client.Body.Close()
+		}
+	}
+	return nil
+}
+
+func (p *Process) Continue() error {
+	return nil
+}
+
+func (p *Process) Delete() error {
+	panic("implement me")
+}
+
+func (p *Process) doFetch(index int, filename string, begin, end int64) (err error) {
+	httpReq, err := BuildRequest(p.res.Req)
+	if err != nil {
+		return err
+	}
+	httpReq.Header.Set(common.HttpHeaderRange, fmt.Sprintf(common.HttpHeaderRangeFormat, begin, end))
+	client := BuildClient()
+
+	// 重试5次
+	for i := 0; i < 5; i++ {
+		var (
+			resp  *http.Response
+			retry bool
+		)
+		resp, err = client.Do(httpReq)
+		if err != nil {
+			// 连接失败，直接重试
+			continue
+		}
+		p.chunks[index].Downloaded = 0
+		p.clients[index] = resp
+		retry, err = func() (bool, error) {
+			defer resp.Body.Close()
+			var (
+				buf    = make([]byte, 8192)
+				offset = begin
+			)
+			for {
+				n, err := resp.Body.Read(buf)
+				if n > 0 {
+					len, err := p.fetcher.GetCtl().Write(filename, offset, buf[:n])
+					if err != nil {
+						return false, err
+					}
+					offset += int64(len)
+					p.chunks[index].Downloaded = p.chunks[i].Downloaded + int64(len)
+				}
+				if err != nil {
+					if err != io.EOF {
+						return true, err
+					}
+					break
+				}
+			}
+			return false, nil
+		}()
+		if err == nil || !retry {
+			// 下载成功，跳出重试
+			break
+		}
+	}
+	if err != nil {
+		p.chunks[index].Status = common.DownloadStatusError
+	} else {
+		p.chunks[index].Status = common.DownloadStatusDone
+	}
+	return
+}
diff --git a/go.mod b/go.mod
index 7351aa56..09585352 100644
--- a/go.mod
+++ b/go.mod
@@ -5,6 +5,8 @@ go 1.13
 require (
 	github.com/RoaringBitmap/roaring v0.4.21
 	github.com/cenkalti/mse v0.0.0-20140930130441-6ef65f170972
+	github.com/google/uuid v1.1.1
 	github.com/marksamman/bencode v0.0.0-20150821143521-dc84f26e086e
 	github.com/sirupsen/logrus v1.4.2
+	golang.org/x/net v0.0.0-20200707034311-ab3426394381
 )
diff --git a/go.sum b/go.sum
index ac334005..5dac46a6 100644
--- a/go.sum
+++ b/go.sum
@@ -12,6 +12,8 @@ github.com/glycerine/goconvey v0.0.0-20190410193231-58a59202ab31 h1:gclg6gY70GLy
 github.com/glycerine/goconvey v0.0.0-20190410193231-58a59202ab31/go.mod h1:Ogl1Tioa0aV7gstGFO7KhffUsb9M4ydbEbbxpcEDc24=
 github.com/golang/snappy v0.0.1 h1:Qgr9rKW7uDUkrbSmQeiDsGa8SjGyCOGtuasMWwvp2P4=
 github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
+github.com/google/uuid v1.1.1 h1:Gkbcsh/GbpXz7lPftLA3P6TYMwjCLYm83jiFQZF/3gY=
+github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/gopherjs/gopherjs v0.0.0-20190910122728-9d188e94fb99 h1:twflg0XRTjwKpxb/jFExr4HGq6on2dEOmnL6FV+fgPw=
 github.com/gopherjs/gopherjs v0.0.0-20190910122728-9d188e94fb99/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
 github.com/jtolds/gls v4.20.0+incompatible h1:xdiiI2gbIgH/gLH7ADydsJ1uDOEzR8yvV7C0MuV77Wo=
@@ -37,8 +39,17 @@ github.com/tinylib/msgp v1.1.0 h1:9fQd+ICuRIu/ue4vxJZu6/LzxN0HwMds2nq/0cFvxHU=
 github.com/tinylib/msgp v1.1.0/go.mod h1:+d+yLhGm8mzTaHzB+wgMYrodPfmZrzkirds8fDWklFE=
 github.com/willf/bitset v1.1.10 h1:NotGKqX0KwQ72NUzqrjZq5ipPNDQex9lo3WpaS8L2sc=
 github.com/willf/bitset v1.1.10/go.mod h1:RjeCKbqT1RxIR/KWY6phxZiaY1IyutSBfGjNPySAYV4=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20200707034311-ab3426394381 h1:VXak5I6aEWmAXeQjA+QSZzlgNrpq9mjcfDemuexIKsU=
+golang.org/x/net v0.0.0-20200707034311-ab3426394381/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190422165155-953cdadca894 h1:Cz4ceDQGXuKRnVBDTS23GTn/pU5OE2C0WrNTOYK1Uuc=
 golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
diff --git a/protocol/bt/dht/ping.go b/protocol/bt/dht/ping.go
new file mode 100644
index 00000000..3a054be6
--- /dev/null
+++ b/protocol/bt/dht/ping.go
@@ -0,0 +1,34 @@
+package dht
+
+import (
+	"github.com/marksamman/bencode"
+	"net"
+)
+
+func ping() string {
+	data := map[string]interface{}{
+		"t": "aa",
+		"y": "q",
+		"q": "ping",
+		"a": map[string]interface{}{"id": "abcdefghij0123456789"},
+	}
+	req := bencode.Encode(data)
+	// session.add_dht_router("router.utorrent.com", 6881)
+	// session.add_dht_router("router.bittorrent.com", 6881)
+	// session.add_dht_router("dht.transmissionbt.com", 6881)
+	// session.add_dht_router("router.bitcomet.com", 6881)
+	// session.add_dht_router("dht.aelitis.com", 6881)
+	dial, err := net.Dial("udp", "router.utorrent.com:6881")
+	if err != nil {
+		panic(err)
+	}
+	dial.Write(req)
+
+	reps := make([]byte, 65535)
+
+	n, err := dial.Read(reps)
+	if err != nil {
+		panic(err)
+	}
+	return string(reps[:n])
+}
diff --git a/protocol/bt/dht/ping_test.go b/protocol/bt/dht/ping_test.go
new file mode 100644
index 00000000..ea0e1e79
--- /dev/null
+++ b/protocol/bt/dht/ping_test.go
@@ -0,0 +1,7 @@
+package dht
+
+import "testing"
+
+func Test_ping(t *testing.T) {
+	println(ping())
+}
diff --git a/protocol/bt/metainfo/metainfo_test.go b/protocol/bt/metainfo/metainfo_test.go
index aa1ab2ba..e940abfd 100644
--- a/protocol/bt/metainfo/metainfo_test.go
+++ b/protocol/bt/metainfo/metainfo_test.go
@@ -3,31 +3,20 @@ package metainfo
 import (
 	"encoding/hex"
 	"fmt"
-	"github.com/RoaringBitmap/roaring"
 	"testing"
 )
 
 func TestParseFromFile(t *testing.T) {
 	// metaInfo, err := ParseFromFile("../testdata/Game.of.Thrones.S08E05.720p.WEB.H264-MEMENTO.torrent")
-	metaInfo, err := ParseFromFile("../testdata/office.torrent")
+	metaInfo, err := ParseFromFile("E:\\bt\\win10.torrent")
 	if err != nil {
 		panic(err)
 	}
 	fmt.Printf("%+v\n", metaInfo.AnnounceList)
-	fmt.Printf("%+v\n", metaInfo.Info.Files)
+	for _, file := range metaInfo.Info.Files {
+		fmt.Printf("%+v\n", file)
+	}
 	fmt.Printf("%+v\n", metaInfo.Info.PieceLength)
 	fmt.Printf("%+v\n", len(metaInfo.Info.Pieces))
 	fmt.Printf("%+v\n", hex.EncodeToString(metaInfo.infoHash[:]))
 }
-
-func TestParseFromFile2(t *testing.T) {
-	a := 0b10010000
-	b := 0b01111111
-	fmt.Printf("%08b\n", (a&b)^b)
-
-	have := roaring.BitmapOf(0, 3)
-	peer := roaring.BitmapOf(1, 2, 3, 4, 5, 6, 7)
-
-	need := roaring.Xor(roaring.And(have, peer), peer)
-	fmt.Println(need.ToArray())
-}
diff --git a/protocol/bt/peer/message/msg_bitfield.go b/protocol/bt/peer/message/msg_bitfield.go
index 54ab50c1..73758181 100644
--- a/protocol/bt/peer/message/msg_bitfield.go
+++ b/protocol/bt/peer/message/msg_bitfield.go
@@ -60,10 +60,9 @@ func (b *Bitfield) IsComplete(i int) bool {
 }
 
 // 给定一组分片下载状态，计算出当前peer能提供下载的分片下标，如果已经拥有则不用提供
-// had = 0b10010000,has = 0b01111111
-// had & has = 0b10010000 & 0b01111111 = 0b00010000
-// had & has ^ has = 0b00010000 ^ 0b01111111 = 0b01101111
+// has = 0b01111111,had = 0b10010000
+// has & ~had = 0b01111111 & 0b01101111 = 0b01101111
 func (b *Bitfield) Provide(had *roaring.Bitmap) []uint32 {
-	xor := roaring.Xor(roaring.And(had, b.bitmap), b.bitmap)
+	xor := roaring.AndNot(b.bitmap, had)
 	return xor.ToArray()
 }
diff --git a/protocol/bt/torrent/peer_conn.go b/protocol/bt/torrent/peer_conn.go
index 478d2b71..c437380a 100644
--- a/protocol/bt/torrent/peer_conn.go
+++ b/protocol/bt/torrent/peer_conn.go
@@ -324,7 +324,7 @@ func (pc *peerConn) handlePiece(buf []byte) {
 			fileWritable := f.End - blockFileBegin
 			// 计算block剩余写入字节数
 			blockWritable := blockLength - blockSeek
-			fb := fileBlock{
+			fb := &fileBlock{
 				filepath:   filepath.Join(f.Path...),
 				fileSeek:   blockFileBegin - f.Begin,
 				blockBegin: blockSeek,
@@ -420,6 +420,7 @@ func (pc *peerConn) handlePiece(buf []byte) {
 }
 
 // 获取piece对应要写入的文件
+// TODO 使用sort.Search二分查找法检索
 func getWriteFile(pieceBegin int64, fds []*metainfo.FileDetail) int {
 	for i, f := range fds {
 		if f.Begin <= pieceBegin && f.End > pieceBegin {
diff --git a/protocol/bt/torrent/peer_conn_test.go b/protocol/bt/torrent/peer_conn_test.go
index 795313df..f951e628 100644
--- a/protocol/bt/torrent/peer_conn_test.go
+++ b/protocol/bt/torrent/peer_conn_test.go
@@ -64,7 +64,7 @@ func getUsablePeerMore() chan *peerConn {
 	peers := <-tracker.Tracker()
 	ch := make(chan *peerConn)
 	for i := range peers {
-		go peerTest(torrent, &peers[i], ch)
+		go peerTest(torrent, peers[i], ch)
 	}
 	return ch
 }
diff --git a/protocol/bt/torrent/peer_pool.go b/protocol/bt/torrent/peer_pool.go
index 2b2d2b97..c5f65794 100644
--- a/protocol/bt/torrent/peer_pool.go
+++ b/protocol/bt/torrent/peer_pool.go
@@ -11,7 +11,7 @@ import (
 type peerPool struct {
 	torrent *Torrent
 
-	states map[peer.Peer]*peerState
+	states map[*peer.Peer]*peerState
 	lock   *sync.Mutex
 }
 
@@ -26,7 +26,7 @@ func newPeerPool(torrent *Torrent) *peerPool {
 	return &peerPool{
 		torrent: torrent,
 		lock:    &sync.Mutex{},
-		states:  map[peer.Peer]*peerState{},
+		states:  map[*peer.Peer]*peerState{},
 	}
 }
 
@@ -52,7 +52,7 @@ func (pp *peerPool) fetch() {
 	}()
 }
 
-func (pp *peerPool) put(peers []peer.Peer) {
+func (pp *peerPool) put(peers []*peer.Peer) {
 	pp.lock.Lock()
 	defer pp.lock.Unlock()
 	for _, peer := range peers {
@@ -72,7 +72,7 @@ func (pp *peerPool) get() *peer.Peer {
 	for peer, state := range pp.states {
 		if !state.using {
 			state.using = true
-			return &peer
+			return peer
 		}
 	}
 	return nil
@@ -82,18 +82,18 @@ func (pp *peerPool) get() *peer.Peer {
 func (pp *peerPool) release(peer *peer.Peer) {
 	pp.lock.Lock()
 	defer pp.lock.Unlock()
-	pp.states[*peer].using = false
-	pp.states[*peer].errors = 0
+	pp.states[peer].using = false
+	pp.states[peer].errors = 0
 }
 
 // 标记peer为不可用，超过3次则剔除该peer
 func (pp *peerPool) unavailable(peer *peer.Peer) {
 	pp.lock.Lock()
 	defer pp.lock.Unlock()
-	pp.states[*peer].using = false
-	pp.states[*peer].errors++
-	if pp.states[*peer].errors > 3 {
-		delete(pp.states, *peer)
+	pp.states[peer].using = false
+	pp.states[peer].errors++
+	if pp.states[peer].errors > 3 {
+		delete(pp.states, peer)
 	}
 
 }
diff --git a/protocol/bt/tracker/tracker.go b/protocol/bt/tracker/tracker.go
index fef4b144..df567a8f 100644
--- a/protocol/bt/tracker/tracker.go
+++ b/protocol/bt/tracker/tracker.go
@@ -7,7 +7,7 @@ import (
 	"io"
 	"io/ioutil"
 	"math"
-	mrand "math/rand"
+	"math/rand"
 	"net"
 	"net/http"
 	"net/url"
@@ -47,7 +47,7 @@ func newUdpConnectRequest() *udpConnectRequest {
 	return &udpConnectRequest{
 		protocolId:    udpConnectRequestMagic,
 		action:        udpActionConnect,
-		transactionId: mrand.Uint32(),
+		transactionId: rand.Uint32(),
 	}
 }
 
@@ -118,7 +118,7 @@ func newUdpAnnounceRequest(connectionId uint64) *udpAnnounceRequest {
 	return &udpAnnounceRequest{
 		connectionId:  connectionId,
 		action:        udpActionAnnounce,
-		transactionId: mrand.Uint32(),
+		transactionId: rand.Uint32(),
 	}
 }
 
@@ -187,7 +187,7 @@ type Tracker struct {
 	MetaInfo *metainfo.MetaInfo
 }
 
-func (tracker *Tracker) connect(conn *net.UDPConn, timeout int64) (response *udpConnectResponse, err error) {
+func (tracker *Tracker) connect(conn net.Conn, timeout int64) (response *udpConnectResponse, err error) {
 	request := newUdpConnectRequest()
 	buf := request.encode()
 	conn.SetReadDeadline(time.Now().Add(time.Second * time.Duration(timeout)))
@@ -204,7 +204,7 @@ func (tracker *Tracker) connect(conn *net.UDPConn, timeout int64) (response *udp
 	return
 }
 
-func (tracker *Tracker) announce(conn *net.UDPConn, timeout int64, connectionId uint64) (response *udpAnnounceResponse, err error) {
+func (tracker *Tracker) announce(conn net.Conn, timeout int64, connectionId uint64) (response *udpAnnounceResponse, err error) {
 	request := newUdpAnnounceRequest(connectionId)
 	request.infoHash = tracker.MetaInfo.GetInfoHash()
 	request.peerID = tracker.PeerID
@@ -346,7 +346,7 @@ func (tracker *Tracker) udpTracker(url *url.URL) (peers []*peer.Peer, err error)
 		var connectResponse *udpConnectResponse
 		// 0:connect 1:announce
 		state := udpActionConnect
-		// 	访问超时最多重试8次，当有请求成功则将重试次数重置为0
+		// 访问超时最多重试8次，当有请求成功则将重试次数重置为0
 		for n := 0; n < udpConnectRetries; n++ {
 			// 15 * 2 ^ n seconds
 			timeout := int64(udpConnectTimeout * math.Pow(2, float64(n)))
@@ -385,26 +385,8 @@ func (tracker *Tracker) udpTracker(url *url.URL) (peers []*peer.Peer, err error)
 	return announceResponse.peers, nil
 }
 
-func dial(trackerUrl *url.URL) (*net.UDPConn, error) {
-	host, portStr, err := net.SplitHostPort(trackerUrl.Host)
-	if err != nil {
-		return nil, err
-	}
-	port, err := strconv.ParseInt(portStr, 10, 32)
-	if err != nil {
-		return nil, err
-	}
-	ip, err := lookupIP(host, trackerUrl.Scheme)
-	if err != nil {
-		return nil, err
-	}
-
-	srcAddr := &net.UDPAddr{IP: net.IPv4zero, Port: 0}
-	dstAddr := &net.UDPAddr{
-		IP:   ip,
-		Port: int(port),
-	}
-	return net.DialUDP(trackerUrl.Scheme, srcAddr, dstAddr)
+func dial(trackerUrl *url.URL) (net.Conn, error) {
+	return net.Dial(trackerUrl.Scheme, trackerUrl.Host)
 }
 
 func lookupIP(host string, scheme string) (ip net.IP, err error) {
diff --git a/protocol/http/down.go b/protocol/http/client.go
similarity index 96%
rename from protocol/http/down.go
rename to protocol/http/client.go
index 8dba50aa..f1c1aa4e 100644
--- a/protocol/http/down.go
+++ b/protocol/http/client.go
@@ -13,11 +13,6 @@ import (
 	"sync"
 )
 
-type Download interface {
-	Resolve(request *http.Request) (*http.Response, error)
-	Down(request *http.Request) error
-}
-
 // Resolve return the file response to be downloaded
 func Resolve(request *Request) (*Response, error) {
 	httpRequest, err := BuildHTTPRequest(request)
@@ -53,9 +48,9 @@ func Resolve(request *Request) (*Response, error) {
 			ret.Name = subLastSlash(parse.Path)
 		}
 	}
-	// Unknow file name
+	// Unknown file name
 	if ret.Name == "" {
-		ret.Name = "unknow"
+		ret.Name = "unknown"
 	}
 	// Is support range
 	ret.Range = response.StatusCode == 206
diff --git a/protocol/http/down_test.go b/protocol/http/client_test.go
similarity index 100%
rename from protocol/http/down_test.go
rename to protocol/http/client_test.go