http://blog.csdn.net/gueter/archive/2007/03/08/1524446.aspx 


Hostͷ 

HostͷָԴIntenetͶ˿ںţʾurlԭʼصλáHTTP/1.1ͷ򣬷ϵͳ400״̬뷵ء 

Refererͷ 

Referer ͷͻָuriԴԴַɻ½ŻcacheȡҲϳĻάĿı ׷١uriûԼuriַRefererָܱ͡ǲuriַ˵ַӦһԵַ 

Rangeͷ 

Rangeͷʵһ߶ӷΧ磬 
ʾͷ500ֽڣbytes=0-499 
ʾڶ500ֽڣbytes=500-999 
ʾ500ֽڣbytes=-500 
ʾ500ֽԺķΧbytes=500- 
һһֽڣbytes=0-0,-1 
ͬʱָΧbytes=500-600,601-999 

ǷԺԴͷGETRangeͷӦ״̬206PartialContentض200 OK 

User-Agentͷ 

User-AgentͷݰûϢ 