diff --git a/pkg/auth/auth.go b/pkg/auth/auth.go
index 86d02c6c..c7fb6c85 100644
--- a/pkg/auth/auth.go
+++ b/pkg/auth/auth.go
@@ -2,6 +2,7 @@ package auth
 
 import (
 	"bytes"
+	"fmt"
 	"io/ioutil"
 	"net/http"
 	"net/url"
@@ -30,9 +31,8 @@ type Auth interface {
 	Check(body string, sign string) error
 }
 
-// SignRequest 对PUT\POST等复杂HTTP请求签名，如果请求Header中
-// 包含 X-Policy， 则此请求会被认定为上传请求，只会对URI部分和
-// Policy部分进行签名。其他请求则会对URI和Body部分进行签名。
+// SignRequest 对PUT\POST等复杂HTTP请求签名，只会对URI部分、
+// 请求正文、`X-`开头的header进行签名
 func SignRequest(instance Auth, r *http.Request, expires int64) *http.Request {
 	// 处理有效期
 	if expires > 0 {
@@ -61,20 +61,28 @@ func CheckRequest(instance Auth, r *http.Request) error {
 	return instance.Check(getSignContent(r), sign[0])
 }
 
-// getSignContent 根据请求Header中是否包含X-Policy判断是否为上传请求，
+// getSignContent 签名请求path、正文、以`X-`开头的header
 // 返回待签名/验证的字符串
 func getSignContent(r *http.Request) (rawSignString string) {
-	if policy, ok := r.Header["X-Policy"]; ok {
-		rawSignString = serializer.NewRequestSignString(r.URL.Path, policy[0], "")
-	} else {
-		var body = []byte{}
-		if r.Body != nil {
-			body, _ = ioutil.ReadAll(r.Body)
-			_ = r.Body.Close()
-			r.Body = ioutil.NopCloser(bytes.NewReader(body))
+	// 读取所有body正文
+	var body = []byte{}
+	if r.Body != nil {
+		body, _ = ioutil.ReadAll(r.Body)
+		_ = r.Body.Close()
+		r.Body = ioutil.NopCloser(bytes.NewReader(body))
+	}
+
+	// 决定要签名的header
+	var signedHeader []string
+	for k, _ := range r.Header {
+		if strings.HasPrefix(k, "X-") {
+			signedHeader = append(signedHeader, fmt.Sprintf("%s=%s", k, r.Header.Get(k)))
 		}
-		rawSignString = serializer.NewRequestSignString(r.URL.Path, "", string(body))
 	}
+
+	// 读取所有待签名Header
+	rawSignString = serializer.NewRequestSignString(r.URL.Path, strings.Join(signedHeader, "&"), string(body))
+
 	return rawSignString
 }
 
diff --git a/pkg/request/request.go b/pkg/request/request.go
index 36195c8d..d6f93afa 100644
--- a/pkg/request/request.go
+++ b/pkg/request/request.go
@@ -12,6 +12,7 @@ import (
 
 	model "github.com/cloudreve/Cloudreve/v3/models"
 	"github.com/cloudreve/Cloudreve/v3/pkg/auth"
+	"github.com/cloudreve/Cloudreve/v3/pkg/conf"
 	"github.com/cloudreve/Cloudreve/v3/pkg/serializer"
 	"github.com/cloudreve/Cloudreve/v3/pkg/util"
 )
@@ -46,6 +47,7 @@ type options struct {
 	signTTL       int64
 	ctx           context.Context
 	contentLength int64
+	masterMeta    bool
 }
 
 type optionFunc func(*options)
@@ -110,6 +112,13 @@ func WithContentLength(s int64) Option {
 	})
 }
 
+// WithMasterMeta 请求时携带主机信息
+func WithMasterMeta() Option {
+	return optionFunc(func(o *options) {
+		o.masterMeta = true
+	})
+}
+
 // Request 发送HTTP请求
 func (c HTTPClient) Request(method, target string, body io.Reader, opts ...Option) *Response {
 	// 应用额外设置
@@ -142,6 +151,12 @@ func (c HTTPClient) Request(method, target string, body io.Reader, opts ...Optio
 
 	// 添加请求相关设置
 	req.Header = options.header
+
+	if options.masterMeta {
+		req.Header.Add("X-Site-Url", model.GetSiteURL().String())
+		req.Header.Add("X-Cloudreve-Version", conf.BackendVersion)
+	}
+
 	if options.contentLength != -1 {
 		req.ContentLength = options.contentLength
 	}
diff --git a/pkg/serializer/auth.go b/pkg/serializer/auth.go
index 7d11dffe..c8b348e5 100644
--- a/pkg/serializer/auth.go
+++ b/pkg/serializer/auth.go
@@ -5,16 +5,15 @@ import "encoding/json"
 // RequestRawSign 待签名的HTTP请求
 type RequestRawSign struct {
 	Path   string
-	Policy string
+	Header string
 	Body   string
 }
 
 // NewRequestSignString 返回JSON格式的待签名字符串
-// TODO 测试
-func NewRequestSignString(path, policy, body string) string {
+func NewRequestSignString(path, header, body string) string {
 	req := RequestRawSign{
 		Path:   path,
-		Policy: policy,
+		Header: header,
 		Body:   body,
 	}
 	res, _ := json.Marshal(req)
diff --git a/routers/controllers/slave.go b/routers/controllers/slave.go
index 6d7e7f0c..464092dd 100644
--- a/routers/controllers/slave.go
+++ b/routers/controllers/slave.go
@@ -10,6 +10,7 @@ import (
 	"github.com/cloudreve/Cloudreve/v3/pkg/filesystem/fsctx"
 	"github.com/cloudreve/Cloudreve/v3/pkg/serializer"
 	"github.com/cloudreve/Cloudreve/v3/service/admin"
+	"github.com/cloudreve/Cloudreve/v3/service/aria2"
 	"github.com/cloudreve/Cloudreve/v3/service/explorer"
 	"github.com/cloudreve/Cloudreve/v3/service/node"
 	"github.com/gin-gonic/gin"
@@ -187,3 +188,14 @@ func SlaveHeartbeat(c *gin.Context) {
 		c.JSON(200, ErrorResponse(err))
 	}
 }
+
+// SlaveAria2Create 创建 Aria2 任务
+func SlaveAria2Create(c *gin.Context) {
+	var service aria2.SlaveAria2Call
+	if err := c.ShouldBindJSON(&service); err == nil {
+		res := service.Add(c)
+		c.JSON(200, res)
+	} else {
+		c.JSON(200, ErrorResponse(err))
+	}
+}
diff --git a/routers/router.go b/routers/router.go
index 3209a985..2656e422 100644
--- a/routers/router.go
+++ b/routers/router.go
@@ -51,6 +51,12 @@ func InitSlaveRouter() *gin.Engine {
 		v3.POST("delete", controllers.SlaveDelete)
 		// 列出文件
 		v3.POST("list", controllers.SlaveList)
+
+		// 离线下载
+		aria2 := v3.Group("aria2")
+		{
+			aria2.POST("task", controllers.SlaveList)
+		}
 	}
 	return r
 }
diff --git a/service/aria2/add.go b/service/aria2/add.go
index 50ad4de0..fa48d439 100644
--- a/service/aria2/add.go
+++ b/service/aria2/add.go
@@ -17,7 +17,14 @@ type AddURLService struct {
 	Dst string `json:"dst" binding:"required,min=1"`
 }
 
-// Add 创建新的链接离线下载任务
+// SlaveAria2Call 从机有关Aria2的请求正文
+type SlaveAria2Call struct {
+	Task         *model.Download        `json:"task"`
+	GroupOptions map[string]interface{} `json:"group_options"`
+	Files        []uint                 `json:"files"`
+}
+
+// Add 主机创建新的链接离线下载任务
 func (service *AddURLService) Add(c *gin.Context, taskType int) serializer.Response {
 	// 创建文件系统
 	fs, err := filesystem.NewFileSystemFromContext(c)
@@ -74,3 +81,8 @@ func (service *AddURLService) Add(c *gin.Context, taskType int) serializer.Respo
 
 	return serializer.Response{}
 }
+
+// Add 从机创建新的链接离线下载任务
+func (service *SlaveAria2Call) Add(c *gin.Context) serializer.Response {
+	return serializer.Response{}
+}