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Type
Type类型
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Expression
Expression表达式
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Valid expressions
Valid expressions有效表达式
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* `F` denotes a type that meets the requirements of [*Fields].
* `W` denotes a type meeting the requirements of __FieldsWriter__.
* `a` denotes a value of type `F`.
* `c` denotes a (possibly const) value of type `F`.
* `b` is a value of type `bool`
* `n` is a value of type `boost::optional<std::uint64_t>`.
* `s` is a value of type [link beast.ref.boost__beast__string_view `string_view`].
* `v` is a value of type `unsigned int` representing the HTTP-version.
* `F` denotes a type that meets the requirements of [*Fields].
* `W` denotes a type meeting the requirements of __FieldsWriter__.
* `a` denotes a value of type `F`.
* `c` denotes a (possibly const) value of type `F`.
* `b` is a value of type表示满足 [*Fields] 要求的类型。
* `W` 表示满足 __FieldsWriter__ 要求的类型。
* `a` 表示类型为 `F` 的值。
* `c` 表示类型为 `F` 的值（可能带有 const 限定）。
* `b` 表示类型为 `bool` 的值。
* `n` is a value of type表示类型为 `boost::optional<std::uint64_t>`. 的值。
* `s` is a value of type表示类型为 [link beast.ref.boost__beast__string_view `string_view`]. 的值。
* `v` is a value of type `unsigned int` representing the HTTP-version.表示类型为 `unsigned int` 的值，用于表示 HTTP 版本。
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In this table:
In this table在下表中:
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Requirements
Requirements要求
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* [link beast.ref.boost__beast__http__is_fields `is_fields`]
* __FieldsWriter__
* [link beast.ref.boost__beast__http__is_fields `is_fields`]
* __FieldsWriter__
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Associated Types
Associated Types关联类型
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An instance of [*Fields] is a container for holding HTTP header fields and their values. The implementation also calls upon the container to store the request target and non-standard strings for method and obsolete reason phrase as needed. Types which meet these requirements can always be serialized.
An instance of [*Fields] is a container for holding HTTP header fields and their values. The implementation also calls upon the container to store the request target and non-standard strings for method and obsolete reason phrase as needed. Types which meet these requirements can always be serialized.`Fields` 的实例是一个用于存储 HTTP 报文字段及其值的容器。该实现还会根据需要调用此容器来存储请求目标，以及非标准的方法字符串和过时的原因短语字符串。满足这些要求的类型始终可以进行序列化。
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Fields
Fields字段
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Contributor joined 06/18/2026
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File “doc/qbk/07_concepts/Fields_zh_Hans.qbk” was added. 06/05/2026
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* [link beast.ref.boost__beast__http__basic_fields `basic_fields`]
* [link beast.ref.boost__beast__http__fields `fields`]
* [link beast.ref.boost__beast__http__basic_fields `basic_fields`]
* [link beast.ref.boost__beast__http__fields `fields`]
06/05/2026
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Models
Models
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Exemplar
Exemplar
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Adjusts the [@https://tools.ietf.org/html/rfc7230#section-6.1 [*Connection]] field value depending on the values of `v` and `b`. The field value is treated as [@https://tools.ietf.org/html/rfc7230#section-6.1 ['connection-option]] (rfc7230).

[itemized_list [ If `(v < 11 && b)`, then all "close" tokens present in the value are removed, and the "keep-alive" token is added to the value if it is not already present. ][ If `(v < 11 && ! b)`, then all "close" and "keep-alive" tokens present in the value are removed.

][ If `(v == 11 && b)`, then all "keep-alive" and "close" tokens present in the value are removed. ][ If `(v == 11 && ! b)`, then all "keep-alive" tokens present in the value are removed, and the "close" token is added to the value if it is not already present. ]]

If the result of adjusting the field value produces an empty string, the field is removed from the container.
Adjusts the [@https://tools.ietf.org/html/rfc7230#section-6.1 [*Connection]] field value depending on the values of `v` and `b`. The field value is treated as [@https://tools.ietf.org/html/rfc7230#section-6.1 ['connection-option]] (rfc7230).

[itemized_list [ If `(v < 11 && b)`, then all "close" tokens present in the value are removed, and the "keep-alive" token is added to the value if it is not already present. ][ If `(v < 11 && ! b)`, then all "close" and "keep-alive" tokens present in the value are removed.

][ If `(v == 11 && b)`, then all "keep-alive" and "close" tokens present in the value are removed. ][ If `(v == 11 && ! b)`, then all "keep-alive" tokens present in the value are removed, and the "close" token is added to the value if it is not already present. ]]

If the result of adjusting the field value produces an empty string, the field is removed from the container.
06/05/2026
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`a.set_keep_alive_impl(v,b)`
`a.set_keep_alive_impl(v,b)`
06/05/2026

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