为何我这里只有youtube打不开？

[ekee]

ERR_EMPTY_RESPONSE就只有youtube解析有问题，其他暂时没发现，解析出错了都。
dig www.youtube.com @127.0.0.1

; <<>> DiG 9.9.5-3ubuntu0.4-Ubuntu <<>> www.youtube.com @127.0.0.1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5969
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.youtube.com. IN A

;; ANSWER SECTION:
www.youtube.com. 77559 IN CNAME youtube-ui.l.google.com.
youtube-ui.l.google.com. 600 IN CNAME youtube-ui-china.l.google.com.
youtube-ui-china.l.google.com. 631 IN A 159.106.121.75

;; Query time: 10 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu Aug 06 03:26:09 CST 2015
;; MSG SIZE rcvd: 114