diff --git a/internal/leetcode/base.go b/internal/leetcode/base.go
index fdf89396b..05886ed10 100644
--- a/internal/leetcode/base.go
+++ b/internal/leetcode/base.go
@@ -1,9 +1,12 @@
 package leetcode
 
 import (
+	"bytes"
 	"encoding/json"
 	"io/ioutil"
 	"net/http"
+	"net/http/cookiejar"
+	"net/url"
 	"os"
 	"os/user"
 	"path"
@@ -15,6 +18,15 @@ func checkErr(err error) {
 	}
 }
 
+func client() *http.Client {
+	jar, err := cookiejar.New(nil)
+	// jar.SetCookies()
+	checkErr(err)
+	return &http.Client{
+		Jar: jar,
+	}
+}
+
 func getCsrfToken(cookies []*http.Cookie) string {
 	for _, cookie := range cookies {
 		if cookie.Name == "csrftoken" {
@@ -38,7 +50,10 @@ func getPath(f string) string {
 func saveCookies(cookies []*http.Cookie) {
 	data, err := json.Marshal(cookies)
 	checkErr(err)
-	err = ioutil.WriteFile(getPath(cookiesFile), data, 0755)
+	dst := bytes.Buffer{}
+	err = json.Indent(&dst, data, "", "\t")
+	checkErr(err)
+	err = ioutil.WriteFile(getPath(cookiesFile), dst.Bytes(), 0755)
 	checkErr(err)
 }
 
@@ -49,3 +64,9 @@ func getCookies() (cookies []*http.Cookie) {
 	checkErr(err)
 	return
 }
+
+func saveCredential(data url.Values) {
+	u := url.UserPassword(data.Get("login"), data.Get("password"))
+	err := ioutil.WriteFile(getPath(credentialsFile), []byte(u.String()), 0755)
+	checkErr(err)
+}
diff --git a/internal/leetcode/login.go b/internal/leetcode/login.go
index ef9c2a34a..f1286407e 100644
--- a/internal/leetcode/login.go
+++ b/internal/leetcode/login.go
@@ -6,15 +6,16 @@ import (
 	"strings"
 )
 
-func AccountsLogin(user string, pwd string) (*http.Response, error) {
+func AccountsLogin(username, password string) (*http.Response, error) {
 	resp, err := http.Head(AccountsLoginUrl)
 	checkErr(err)
+	defer resp.Body.Close()
 	cookies := resp.Cookies()
 	saveCookies(cookies)
 	csrftoken := getCsrfToken(cookies)
 	data := url.Values{
-		"login":               {user},
-		"password":            {pwd},
+		"login":               {username},
+		"password":            {password},
 		"csrfmiddlewaretoken": {csrftoken},
 	}
 	req, err := http.NewRequest("POST", AccountsLoginUrl, strings.NewReader(data.Encode()))
@@ -26,6 +27,10 @@ func AccountsLogin(user string, pwd string) (*http.Response, error) {
 	}
 	resp, err = http.DefaultClient.Do(req)
 	checkErr(err)
+	defer resp.Body.Close()
 	saveCookies(resp.Cookies())
+	if resp.StatusCode == 200 {
+		saveCredential(data)
+	}
 	return resp, err
 }