diff --git a/notify/send.go b/notify/send.go
index f1a6a28..4544fd8 100644
--- a/notify/send.go
+++ b/notify/send.go
@@ -3,12 +3,22 @@ package notify
 import (
 	"encoding/json"
 	"fmt"
+	"io"
 	"net/http"
 )
 
 const lineNotifyApiURL = "https://notify-api.line.me/api/notify"
 
-func sendToLineServer(req *http.Request, accessToken string) (err error) {
+func sendToLineServer(body io.Reader, accessToken, contentType string) (err error) {
+	req, err := http.NewRequest(
+		"POST",
+		lineNotifyApiURL,
+		body,
+	)
+	if err != nil {
+		return
+	}
+	req.Header.Set("Content-Type", contentType)
 	req.Header.Set("Authorization", "Bearer "+accessToken)
 
 	client := &http.Client{}
@@ -21,18 +31,18 @@ func sendToLineServer(req *http.Request, accessToken string) (err error) {
 		return
 	}
 
-	var body struct {
+	var responseBody struct {
 		Status  int    `json:"status"`
 		Message string `json:"message"`
 	}
 
-	if err = json.NewDecoder(res.Body).Decode(&body); err != nil {
+	if err = json.NewDecoder(res.Body).Decode(&responseBody); err != nil {
 		return
 	}
 	defer res.Body.Close()
 
-	if body.Status != 200 {
-		err = fmt.Errorf("%d: %s", body.Status, body.Message)
+	if responseBody.Status != 200 {
+		err = fmt.Errorf("%d: %s", responseBody.Status, responseBody.Message)
 	}
 	return
 }
diff --git a/notify/send_image.go b/notify/send_image.go
index 30452a6..9121446 100644
--- a/notify/send_image.go
+++ b/notify/send_image.go
@@ -1,27 +1,19 @@
 package notify
 
 import (
-	"net/http"
 	"net/url"
 	"strings"
 )
 
 // SendImage : send line notify simple text with image
 func SendImage(accessToken, message, imageURL string) (err error) {
-	req, err := http.NewRequest(
-		"POST",
-		lineNotifyApiURL,
-		strings.NewReader(url.Values{
-			"message":        []string{message},
-			"imageThumbnail": []string{imageURL},
-			"imageFullsize":  []string{imageURL},
-		}.Encode()),
-	)
-	if err != nil {
-		return
-	}
-	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	body := strings.NewReader(url.Values{
+		"message":        []string{message},
+		"imageThumbnail": []string{imageURL},
+		"imageFullsize":  []string{imageURL},
+	}.Encode())
+	contentType := "application/x-www-form-urlencoded"
 
-	err = sendToLineServer(req, accessToken)
+	err = sendToLineServer(body, accessToken, contentType)
 	return
 }
diff --git a/notify/send_local_image.go b/notify/send_local_image.go
index 0086af2..87bb4b7 100644
--- a/notify/send_local_image.go
+++ b/notify/send_local_image.go
@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"io"
 	"mime/multipart"
-	"net/http"
 	"os"
 	"strings"
 )
@@ -13,17 +12,7 @@ import (
 func SendLocalImage(accessToken, message, imagePath string) (err error) {
 	body, contentType, err := makeMultipartBody(message, imagePath)
 
-	req, err := http.NewRequest(
-		"POST",
-		lineNotifyApiURL,
-		&body,
-	)
-	if err != nil {
-		return
-	}
-	req.Header.Set("Content-Type", contentType)
-
-	err = sendToLineServer(req, accessToken)
+	err = sendToLineServer(&body, accessToken, contentType)
 	return
 }
 
diff --git a/notify/send_sticker.go b/notify/send_sticker.go
index 8e8e2c8..145a002 100644
--- a/notify/send_sticker.go
+++ b/notify/send_sticker.go
@@ -1,7 +1,6 @@
 package notify
 
 import (
-	"net/http"
 	"net/url"
 	"strconv"
 	"strings"
@@ -13,20 +12,13 @@ import (
 //
 // https://devdocs.line.me/files/sticker_list.pdf
 func SendSticker(accessToken, message string, stickerPackageId, stickerId int) (err error) {
-	req, err := http.NewRequest(
-		"POST",
-		lineNotifyApiURL,
-		strings.NewReader(url.Values{
-			"message":          []string{message},
-			"stickerPackageId": []string{strconv.Itoa(stickerPackageId)},
-			"stickerId":        []string{strconv.Itoa(stickerId)},
-		}.Encode()),
-	)
-	if err != nil {
-		return
-	}
-	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	body := strings.NewReader(url.Values{
+		"message":          []string{message},
+		"stickerPackageId": []string{strconv.Itoa(stickerPackageId)},
+		"stickerId":        []string{strconv.Itoa(stickerId)},
+	}.Encode())
+	contentType := "application/x-www-form-urlencoded"
 
-	err = sendToLineServer(req, accessToken)
+	err = sendToLineServer(body, accessToken, contentType)
 	return
 }
diff --git a/notify/send_text.go b/notify/send_text.go
index bb597b0..e56a6c3 100644
--- a/notify/send_text.go
+++ b/notify/send_text.go
@@ -1,25 +1,17 @@
 package notify
 
 import (
-	"net/http"
 	"net/url"
 	"strings"
 )
 
 // SendText : send line notify simple text
 func SendText(accessToken, message string) (err error) {
-	req, err := http.NewRequest(
-		"POST",
-		lineNotifyApiURL,
-		strings.NewReader(url.Values{
-			"message": []string{message},
-		}.Encode()),
-	)
-	if err != nil {
-		return
-	}
-	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	body := strings.NewReader(url.Values{
+		"message": []string{message},
+	}.Encode())
+	contentType := "application/x-www-form-urlencoded"
 
-	err = sendToLineServer(req, accessToken)
+	err = sendToLineServer(body, accessToken, contentType)
 	return
 }