12.15 内容位置 Content-Location........................................................................................54
12.16 内容类型（Content-Type）........................................................................................54
12.17 序列号 CSeq...............................................................................................................54
12.18 日期（Date） ..............................................................................................................54
12.19 过期Expires .................................................................................................................54
12.20 来自 From...................................................................................................................56
12.21 主机 Host....................................................................................................................56
12.22 如果匹配If-Match .......................................................................................................56
12.23 从何时更改（If-Modified-Since）.............................................................................56
12.24 最近更改（Last-Modified）.......................................................................................57
12.25 位置（Location） .......................................................................................................57
12.26 代理授权 Proxy-Authenticate ....................................................................................57
12.27 代理要求 Proxy-Require ............................................................................................57
12.28 公用性 public..............................................................................................................57
12.29 范围 Range .................................................................................................................58
12.30 提交方（Referer）......................................................................................................59
12.31 稍后再试 Retry-After.................................................................................................59
12.32 要求 Require...............................................................................................................59
12.33 RTP信息 RTP-Info.......................................................................................................60
12.34 比例 Scale...................................................................................................................61
12.35 速度 Speed..................................................................................................................62
12.36 服务器（Server） .......................................................................................................62
12.37 会话 Session ...............................................................................................................63
12.38 时间戳 Timestamp......................................................................................................63
12.39 传输 Transport ............................................................................................................64
12.40 不支持 Unsupported...................................................................................................68
12.41 用户代理（User-Agent） ...........................................................................................68
12.42 变化..............................................................................................................................68
12.43 通过..............................................................................................................................68
12.44 WWW-授权（WWW-Authenticate）..........................................................................68
13 缓存 50.....................................................................................................................................68
14 实例 Examples.........................................................................................................................70
14.1 要求媒体（单播） Media on Demand (Unicast) ........................................................70
14.2 容器文件的流 Streaming of a Container file ...............................................................73
14.3 单个流容器文件 Single Stream Container Files..........................................................76
14.4 组播现场媒体表示 Live Media Presentation Using Multicast..................................78
14.5 在存在的会话中播放媒体 Playing media into an existing session.............................79
14.6 录制 Recording.............................................................................................................81
15 语法 Syntax .............................................................................................................................83
15.1 基本语法 Base Syntax..................................................................................................83
16 安全考虑（Security Considerations） ....................................................................................84
附录A: RTSP协议状态机 RTSP Protocol State Machines .......................................................88
A.1 客户端状态机 Client State Machine ...........................................................................88
A.2 服务器端状态机 Server State Machine.........................................................................90
4
