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* [link beast.ref.boost__beast__http__basic_dynamic_body `basic_dynamic_body`]
* [link beast.ref.boost__beast__http__basic_file_body `basic_file_body`]
* [link beast.ref.boost__beast__http__basic_string_body `basic_string_body`]
* [link beast.ref.boost__beast__http__buffer_body `buffer_body`]
* [link beast.ref.boost__beast__http__empty_body `empty_body`]
* [link beast.ref.boost__beast__http__span_body `span_body`]
* [link beast.ref.boost__beast__http__vector_body `vector_body`]
* [link beast.ref.boost__beast__http__basic_dynamic_body `basic_dynamic_body`]
* [link beast.ref.boost__beast__http__basic_file_body `basic_file_body`]
* [link beast.ref.boost__beast__http__basic_string_body `basic_string_body`]
* [link beast.ref.boost__beast__http__buffer_body `buffer_body`]
* [link beast.ref.boost__beast__http__empty_body `empty_body`]
* [link beast.ref.boost__beast__http__span_body `span_body`]
* [link beast.ref.boost__beast__http__vector_body `vector_body`]
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Models
Models模型
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Exemplar
Exemplar示例
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This static member function is optional. It returns the payload size of `body` in bytes not including any chunked transfer encoding. The return value may be zero, to indicate that the message is known to have no payload. The function shall not exit via an exception.

When this function is present:

* The function shall not fail

* A call to [link beast.ref.boost__beast__http__message.payload_size `message::payload_size`] will return the same value as `size`.

* A call to [link beast.ref.boost__beast__http__message.prepare_payload `message::prepare_payload`] will remove "chunked" from the Transfer-Encoding field if it appears as the last encoding, and will set the Content-Length field to the returned value.

Otherwise, when the function is omitted:

* A call to [link beast.ref.boost__beast__http__message.payload_size `message::payload_size`] will return `boost::none`.

* A call to [link beast.ref.boost__beast__http__message.prepare_payload `message::prepare_payload`] will erase the Content-Length field, and add "chunked" as the last encoding in the Transfer-Encoding field if it is not already present.
This static member function is optional. It returns the payload size of `body` in bytes not including any chunked transfer encoding. The return value may be zero, to indicate that the message is known to have no payload. The function shall not exit via an exception.

When this function is present:

* The function shall not fail

* A call to该静态成员函数为可选。它返回消息体的大小（以字节为单位），不包含任何分块传输编码。返回值可能为零，表示已知消息不包含有效载荷。该函数不应通过异常退出。

当该函数存在时：

* 函数不应失败。
* 调用 [link beast.ref.boost__beast__http__message.payload_size `message::payload_size`] will return the same value as `size`.

* A call to将返回与 `size` 相同的值。
* 调用 [link beast.ref.boost__beast__http__message.prepare_payload `message::prepare_payload`] will remove "chunked" from the Transfer-Encoding field if it appears as the last encoding, and will set the Content-Length field to the returned value.

Otherwise, when the function is omitted:

* A call to将移除 Transfer-Encoding 字段中的 "chunked"（如果它作为最后一个编码出现），并将 Content-Length 字段设置为返回的值。

否则，当该函数省略时：

* 调用 [link beast.ref.boost__beast__http__message.payload_size `message::payload_size`] will return将返回 `boost::none`.

* A call to。
* 调用 [link beast.ref.boost__beast__http__message.prepare_payload `message::prepare_payload`] will erase the将擦除 Content-Length field, and add "chunked" as the last encoding in the Transfer-Encoding field if it is not already present.字段，并在 Transfer-Encoding 字段中添加 "chunked" 作为最后一个编码（如果尚未存在）。
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`std::uint64_t`
`std::uint64_t`
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B::size(
B::value_type body)
B::size(
B::value_type body)
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If present, indicates that the body is serializable. The type must meet the requirements of __BodyWriter__. The implementation constructs an object of this type to obtain buffers representing the message body for serialization.
If present, indicates that the body is serializable. The type must meet the requirements of __BodyWriter__. The implementation constructs an object of this type to obtain buffers representing the message body for serialization.若存在该类型，则用于表示该主体可序列化。该类型必须满足 __BodyWriter__ 的要求。该实现用于构造该类型的对象，以获取用于表示消息主体序列化内容的缓冲区。
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`B::writer`
`B::writer`
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If present, indicates that the body can be parsed. The type must meet the requirements of __BodyReader__. The implementation constructs an object of this type to obtain buffers into which parsed body octets are placed.
If present, indicates that the body can be parsed. The type must meet the requirements of __BodyReader__. The implementation constructs an object of this type to obtain buffers into which parsed body octets are placed.若该类型存在，则表示消息体可被解析。该类型必须满足 __BodyReader__ 的要求。实现会构造该类型的对象，用于获取存放已解析消息体八位字节的缓冲区。
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`B::reader`
`B::reader`
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The return type of the `message::body` member function. If this is not movable or not copyable, the containing message will be not movable or not copyable.
The return type of the `message::body` member function. If this is not movable or not copyable, the containing message will be not movable or not copyable.`message::body` 成员函数返回的类型。如果该类型不支持移动或复制，则包含它的消息对象同样不支持移动或复制。
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`B::value_type`
`B::value_type`
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Semantics, Pre/Post-conditions
Semantics, Pre/Post-conditions语义、前置条件与后置条件
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Type
Type类型
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