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[单选题]
网页的缓存是由HTTP消息头中哪个字段控制的()
A.Pragma
B.Cache-control
C.Transfer-Encoding
D.Upgrade
查看答案
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.Pragma
B.Cache-control
C.Transfer-Encoding
D.Upgrade
A.WM_CREATE、WM_ACTIVATE、WM_DESTOROY
B.TextMessage、ObjectMessage、StreamMessage
C.GET、POST、PUT
D.LSR、LSU、LSAck
A.TRANSACTION_DELAY
B.FST_HTTP_DELAY
C.TCP_RTT
D.FristTransRepToRspDelay