diff --git a/client.go b/client.go
index feecfaa..34dafdd 100644
--- a/client.go
+++ b/client.go
@@ -4,15 +4,9 @@ import (
 	"github.com/imroc/req"
 )
 
-func sendNewZhihuRequest(u string) ([]byte, error) {
-	r, err := req.Get(u, req.Header{
+func sendNewZhihuRequest(u string) (*req.Resp, error) {
+	return req.Get(u, req.Header{
 		"User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.75 Safari/537.36",
 		"Referer":    "https://zhuanlan.zhihu.com/",
 	}, nil)
-
-	if err != nil {
-		return nil, err
-	}
-
-	return r.ToBytes()
 }
diff --git a/crawler.go b/crawler.go
index 09134bc..c5f761c 100644
--- a/crawler.go
+++ b/crawler.go
@@ -1,9 +1,7 @@
 package ZhihuZhuanlanCrawler
 
 import (
-	"encoding/json"
 	"fmt"
-	"log"
 )
 
 func GetPinnedArticlePidAndAuthor(columnName string) (*PinnedArticleAndAuthor, error) {
@@ -13,14 +11,12 @@ func GetPinnedArticlePidAndAuthor(columnName string) (*PinnedArticleAndAuthor, e
 	u := fmt.Sprintf("https://zhuanlan.zhihu.com/api/columns/%s/pinned-article", columnName)
 	res, err := sendNewZhihuRequest(u)
 	if err != nil {
-		log.Println(err)
 		return nil, err
 	}
 
 	pinnedArticleAndAuthor := PinnedArticleAndAuthor{}
-	err = json.Unmarshal(res, &pinnedArticleAndAuthor)
+	err = res.ToJSON(&pinnedArticleAndAuthor)
 	if err != nil {
-		log.Println(err)
 		return nil, err
 	}
 
@@ -34,14 +30,12 @@ func GetSingleArticle(pid int) (*Article, error) {
 	u := fmt.Sprintf("https://api.zhihu.com/articles/%d", pid)
 	res, err := sendNewZhihuRequest(u)
 	if err != nil {
-		log.Println(err)
 		return nil, err
 	}
 
 	article := Article{}
-	err = json.Unmarshal(res, &article)
+	err = res.ToJSON(&article)
 	if err != nil {
-		log.Println(err)
 		return nil, err
 	}
 
@@ -59,14 +53,12 @@ func GetArticlesListPids(columnName string) ([]int, error) {
 	u := fmt.Sprintf("https://zhuanlan.zhihu.com/api/columns/%s/articles?limit=%d&offset=%d", columnName, limit, offset)
 	res, err := sendNewZhihuRequest(u)
 	if err != nil {
-		log.Println(err)
 		return nil, err
 	}
 
 	articleList := ArticleList{}
-	err = json.Unmarshal(res, &articleList)
+	err = res.ToJSON(&articleList)
 	if err != nil {
-		log.Println(err)
 		return nil, err
 	}
 
@@ -80,14 +72,12 @@ func GetArticlesListPids(columnName string) ([]int, error) {
 		u := fmt.Sprintf("https://zhuanlan.zhihu.com/api/columns/%s/articles?limit=%d&offset=%d", columnName, limit, offset)
 		res, err := sendNewZhihuRequest(u)
 		if err != nil {
-			log.Println(err)
 			return nil, err
 		}
 
 		articleList := ArticleList{}
-		err = json.Unmarshal(res, &articleList)
+		err = res.ToJSON(&articleList)
 		if err != nil {
-			log.Println(err)
 			return nil, err
 		}
 		for _, entry := range articleList.Data {