2.2 Conventions and Terminology / 约定和术语

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119].

本文档中出现的关键词"MUST","MUST NOT","REQUIRED","SHALL","SHALL NOT","SHOULD","SHOULD NOT","RECOMMENDED","MAY",和"OPTIONAL"在RFC 2119 [RFC2119] 中有解释。

All numeric values are in network byte order. Values are unsigned unless otherwise indicated. Literal values are provided in decimal or hexadecimal as appropriate. Hexadecimal literals are prefixed with 0x to distinguish them from decimal literals.

所有数值都以网络字节序表示。除非另有说明，否则数值都是无符号的。视情况以十进制或十六进制表示字面值。十六进制值带有0x前缀，以和十进制值区分开。

The following terms are used:

  • client: The endpoint that initiates an HTTP/2 connection. Clients send HTTP requests and receive HTTP responses.
  • connection: A transport-layer connection between two endpoints.
  • connection error: An error that affects the entire HTTP/2 connection.
  • endpoint: Either the client or server of the connection.
  • frame: The smallest unit of communication within an HTTP/2 connection, consisting of a header and a variable-length sequence of octets structured according to the frame type.
  • peer: An endpoint. When discussing a particular endpoint, "peer" refers to the endpoint that is remote to the primary subject of discussion.
  • receiver: An endpoint that is receiving frames.
  • sender: An endpoint that is transmitting frames.
  • server: The endpoint that accepts an HTTP/2 connection. Servers receive HTTP requests and send HTTP responses.

  • stream: A bidirectional flow of frames within the HTTP/2 connection.

  • stream error: An error on the individual HTTP/2 stream.

文中使用的术语包括：

  • 客户端： 发起HTTP/2连接的端点。客户端发送HTTP请求，并接收HTTP响应。
  • 连接： 两个端点之间的传输层连接。
  • 连接错误： 影响整个HTTP/2连接的错误。
  • 端点： 连接中的客户端或服务器。
  • 帧： HTTP/2连接中的最小通信单元，由首部和可变长度的字节序列组成，其结构取决于帧类型。
  • 对端： 一个端点。当讨论一个特定的端点时，『对端』指的是其远程端点。
  • 接收端： 接收帧的端点。
  • 发送端： 发送帧的端点。
  • 服务端： 接受HTTP/2连接请求的端点。服务端接收HTTP请求，并发送HTTP响应。
  • 流： HTTP/2连接中的双向帧传输流。
  • 流错误： 发生在单独的HTTP/2流上的错误。

Finally, the terms "gateway", "intermediary", "proxy", and "tunnel" are defined in Section 2.3 of [RFC 7230]. Intermediaries act as both client and server at different times.

最后，『网关』、『中介』、『代理』和『隧道』等术语都在 [RFC 7230] 的 2.3节 中有定义。在不同的时候，中介既可以是客户端，又可以是服务端。

The term "payload body" is defined in Section 3.3 of [RFC 7230].

术语『有效载荷体』在 [RFC 7230] 的 3.3节 中有定义。

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