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Parsing of the “doc/qbk/04_http/01_primer_zh_Hans.qbk” file was enforced. 06/26/2026
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Resource updated
Parsing of the “doc/qbk/04_http/01_primer.qbk” file was enforced. 06/26/2026
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Translation completed 06/16/2026
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The Upgrade header field provides a mechanism to transition from HTTP/1.1 to another protocol on the same connection. For example, it is the mechanism used by WebSocket's initial HTTP handshake to establish a WebSocket connection.
The Upgrade header field provides a mechanism to transition from HTTP/1.1 to another protocol on the same connection. For example, it is the mechanism used by WebSocket's initial HTTP handshake to establish a WebSocket connection.头部字段提供一种在同一连接上从 HTTP/1.1 切换到其他协议的机制。例如，WebSocket 的初始 HTTP 握手就是利用该机制来建立 WebSocket 连接的。
06/16/2026
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[@https://tools.ietf.org/html/rfc7230#section-6.7 [*`Upgrade`]]
[@https://tools.ietf.org/html/rfc7230#section-6.7 [*`Upgrade`]]
06/16/2026
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This optional field lists the names of the sequence of transfer codings that have been (or will be) applied to the content payload to form the message body.

Beast understands the "chunked" coding scheme when it is the last (outermost) applied coding. The library will automatically apply chunked encoding when the content length is not known ahead of time during serialization, and the library will automatically remove chunked encoding from parsed messages when present.
This optional field lists the names of the sequence of transfer codings that have been (or will be) applied to the content payload to form the message body.

Beast understands the "chunked" coding scheme when it is the last (outermost) applied coding. The library will automatically apply chunked encoding when the content length is not known ahead of time during serialization, and the library will automatically remove chunked encoding from parsed messages when present.该可选字段用于列出已应用或将要应用于内容有效载荷的传输编码序列，以形成消息体。Beast 能够识别作为最后（最外层）应用的编码方案中的 “chunked” 编码。当序列化过程中无法预先确定内容长度时，该库会自动应用分块编码；同样，在解析消息时如果存在分块编码，该库也会自动将其移除。
06/16/2026
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[@https://tools.ietf.org/html/rfc7230#section-3.3.1 [*`Transfer-Encoding`]]
[@https://tools.ietf.org/html/rfc7230#section-3.3.1 [*`Transfer-Encoding`]]
06/16/2026
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When present, this field informs the recipient about the exact size in bytes of the body which follows the message header.
When present, this field informs the recipient about the exact size in bytes of the body which follows the message header.该字段用于告知接收方消息头部之后的消息体的确切字节数。
06/16/2026
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Translation changed
[@https://tools.ietf.org/html/rfc7230#section-3.3.2 [*`Content-Length`]]
[@https://tools.ietf.org/html/rfc7230#section-3.3.2 [*`Content-Length`]]
06/16/2026
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This field allows the sender to indicate desired control options for the current connection. Common values include "close", "keep-alive", and "upgrade".
This field allows the sender to indicate desired control options for the current connection. Common values include "close", "该字段允许发送方指定当前连接所需的控制选项。常见值包括 `close`、`keep-alive", and "` 和 `upgrade".`。
06/16/2026
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[@https://tools.ietf.org/html/rfc7230#section-6.1 [*`Connection`]]

[@https://tools.ietf.org/html/rfc7230#appendix-A.1.2 [*`Proxy-Connection`]]
[@https://tools.ietf.org/html/rfc7230#section-6.1 [*`Connection`]]

[@https://tools.ietf.org/html/rfc7230#appendix-A.1.2 [*`Proxy-Connection`]]
06/16/2026
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Description
Description描述
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Field
Field字段
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Special Fields
Special Fields特殊字段
110
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Certain fields appearing in messages are special. The library understands these fields when performing serialization and parsing, taking automatic action as needed when the fields are parsed in a message and also setting the fields if the caller requests it.
Certain fields appearing in messages are special. The library understands these fields when performing serialization and parsing, taking automatic action as needed when the fields are parsed in a message and also setting the fields if the caller requests it.消息中的某些字段具有特殊含义。在执行序列化和解析时，该库能够识别这些字段，并在解析到这些字段时自动采取相应操作；同时，如果调用方提出要求，该库也会对这些字段进行设置。
06/16/2026
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Translation changed
Special Fields
Special Fields特殊字段
103
06/16/2026
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Messages may optionally carry a body. The size of the message body is determined by the semantics of the message and the special fields Content-Length and Transfer-Encoding. [@https://tools.ietf.org/html/rfc7230#section-3.3 rfc7230 section 3.3] provides a comprehensive description for how the body length is determined.
Messages may optionally carry a body. The size of the message body is determined by the semantics of the message and the special fields消息可以携带消息体（可选）。消息体的大小由消息本身的语义，以及 Content-Length and和 Transfer-Encoding. 这两个特殊字段共同决定。关于如何确定消息体长度，详见 [@https://tools.ietf.org/html/rfc7230#section-3.3 rfc7230 section 3.3] provides a comprehensive description for how the body length is determined.第 3.3 节]。
06/16/2026
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Body
Body消息体
06/16/2026
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This response has a [@https://tools.ietf.org/html/rfc7231#section-6 200 status code] meaning the operation requested completed successfully. The obsolete reason phrase is "OK". It specifies HTTP version 1.1, and contains a body 13 octets in size with the text "Hello, world!".
This response has a该响应的 [@https://tools.ietf.org/html/rfc7231#section-6 200 status code] meaning the operation requested completed successfully. The obsolete reason phrase is "OK". It specifies HTTP version 1.1, and contains a body 13 octets in size with the text "状态码为 200]，表示请求操作成功完成。已废弃的原因短语为 “OK”。该响应指定 HTTP 版本 1.1，并包含一个大小为 13 个八位字节的消息体，内容为文本 “Hello, world!".”。
06/16/2026
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Translation changed
HTTP/1.1 200 OK\r\n
Server: Beast\r\n
Content-Length: 13\r\n
\r\n
Hello, world!
HTTP/1.1 200 OK\r\n
Server: Beast\r\n
Content-Length: 13\r\n
\r\n
Hello, world!
06/16/2026

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