aria2.conf: add option 'http-want-digest'

aria2.conf

@@ -7,7 +7,7 @@
 # https://github.com/P3TERX/aria2.conf
 # File name：aria2.conf
 # Description: Awesome Aria2 configuration file
-# Version: 2020.12.24
+# Version: 2020.12.28
 #
 
 ## 文件保存设置 ##
@@ -401,6 +401,10 @@ summary-interval=0
 # 在服务器返回未知状态码时重试，仅当 retry-wait > 0 时有效，默认 false
 #retry-on-unknown=true
 
+# 是否发送 Want-Digest HTTP 标头。默认：false (不发送)
+# 部分网站会把此标头作为特征来检测和屏蔽 Aria2
+#http-want-digest=false
+
 
 ## BitTorrent trackers ##
 bt-tracker=