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Determines the type of the [link beast.ref.boost__beast__http__message.body `message::body`] member.
Determines the type of the用于确定 [link beast.ref.boost__beast__http__message.body `message::body`] member.成员的类型。
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`value_type`
`value_type`
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Description
Description描述
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Name
Name名称
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Body Type Members
Body Type Members消息体类型的成员
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The meaning of the nested types is as follows
The meaning of the nested types is as follows嵌套类型的含义如下：
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} ```
} ```
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User-defined types are possible for the message body, where the type meets the __Body__ requirements. This simplified class declaration shows the customization points available to user-defined body types: ``` /// Defines a Body type struct body {
User-defined types are possible for the message body, where the type meets the __Body__ requirements. This simplified class declaration shows the customization points available to user-defined body types: ``` /// Defines a Body type用户可以为消息体定义自己的类型，只要该类型符合 __Body__ 的要求。下面这个简化的类声明展示了用户自定义消息体类型有哪些可用的定制点：``` /// 定义一个消息体类型 struct body {
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Custom Body Types
Custom Body Types自定义消息体类型
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Chunk Body: First
Extension: quality = 1.0
Chunk Body: Hello, world!
Extension: file = abc.txt
Extension: quality = 0.7
Chunk Body: The Next Chunk
Extension: last
Chunk Body: Last one
Expires: never
Content-MD5: f4a5c16584f03d90
Chunk Body: First
Extension: 分块体：First
扩展：quality = 1.0
Chunk Body: 分块体：Hello, world!
Extension: 扩展：file = abc.txt
Extension: 扩展：quality = 0.7
Chunk Body: 分块体：The Next Chunk
Extension: last
Chunk Body: 扩展：last
分块体：Last one
Expires: never
Content-MD5: f4a5c16584f03d90
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Translation completed 06/18/2026
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Chunk Body: First
Extension: quality = 1.0
Chunk Body: Hello, world!
Extension: file = abc.txt
Extension: quality = 0.7
Chunk Body: The Next Chunk
Extension: last
Chunk Body: Last one
Expires: never
Content-MD5: f4a5c16584f03d90
Chunk Body: First
Extension: quality = 1.0
Chunk Body: Hello, world!
Extension: file = abc.txt
Extension: quality = 0.7
Chunk Body: The Next Chunk
Extension: last
Chunk Body: Last one
Expires: never
Content-MD5: f4a5c16584f03d90
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HTTP/1.1 200 OK\r\n
Server: test\r\n
Trailer: Expires, Content-MD5\r\n
Transfer-Encoding: chunked\r\n
\r\n
5\r\n
First\r\n
d;quality=1.0\r\n
Hello, world!\r\n
e;file=abc.txt;quality=0.7\r\n
The Next Chunk\r\n
8;last\r\n
Last one\r\n
0\r\n
Expires: never\r\n
Content-MD5: f4a5c16584f03d90\r\n
\r\n
HTTP/1.1 200 OK\r\n
Server: test\r\n
Trailer: Expires, Content-MD5\r\n
Transfer-Encoding: chunked\r\n
\r\n
5\r\n
First\r\n
d;quality=1.0\r\n
Hello, world!\r\n
e;file=abc.txt;quality=0.7\r\n
The Next Chunk\r\n
8;last\r\n
Last one\r\n
0\r\n
Expires: never\r\n
Content-MD5: f4a5c16584f03d90\r\n
\r\n
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Output
Output输出
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Input
Input输入
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Chunk Parsing Example Output
Chunk Parsing Example Output分块解析示例输出
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Given the HTTP response as input on the left, the output of the function shown above is shown on the right:
Given the HTTP response as input on the left, the output of the function shown above is shown on the right:给定左侧的 HTTP 响应作为输入，上述函数的输出结果如右侧所示：
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This example will read a message header from the stream, and then manually read each chunk. It recognizes the chunk boundaries and outputs the contents of each chunk as it comes in. Any chunk extensions are printed, each extension on its own line. Finally, any trailers promised in the header are printed.
This example will read a message header from the stream, and then manually read each chunk. It recognizes the chunk boundaries and outputs the contents of each chunk as it comes in. Any chunk extensions are printed, each extension on its own line. Finally, any trailers promised in the header are printed.本示例将从流中读取消息头部，然后手动读取每个分块。示例能够识别分块边界，并在分块到达时输出其内容。所有分块扩展都会被打印，每个扩展单独占一行。最后，还会打印头部中承诺的尾部字段。
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Set a callback to be invoked on chunk body data.

The callback will be invoked one or more times to provide buffers corresponding to the chunk body for the current chunk. The callback receives the number of octets remaining in this chunk body including the octets in the buffer provided.

The callback must return the number of octets actually consumed. Any octets not consumed will be presented again in a subsequent invocation of the callback. The implementation type-erases the callback without requiring a dynamic allocation. For this reason, the callback object is passed by a non-constant reference.

The function object will be called with this equivalent signature:
Set a callback to be invoked on chunk body data.

The callback will be invoked one or more times to provide buffers corresponding to the chunk body for the current chunk. The callback receives the number of octets remaining in this chunk body including the octets in the buffer provided.

The callback must return the number of octets actually consumed. Any octets not consumed will be presented again in a subsequent invocation of the callback. The implementation type-erases the callback without requiring a dynamic allocation. For this reason, the callback object is passed by a non-constant reference.

The function object will be called with this equivalent signature:设置一个回调函数，在分块体数据到达时调用。

该回调函数会被调用一次或多次，用于提供当前分块体对应的缓冲区数据。回调函数会收到当前分块体中剩余的字节数（包含当前缓冲区中的字节）。

回调函数必须返回实际消耗的字节数。未被消耗的字节会在后续回调调用中再次提供。该实现通过类型擦除处理回调，且无需动态分配内存，因此回调对象通过非常量引用传递。

回调函数对象的调用签名等效于：
06/18/2026

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