Boost Beast Translation (zh_Hans)/Doc / Qbk / 07 Concepts / Fields (qbk) — Chinese (Simplified Han script) @ Boost-Weblate: Returns `true` if the [@https://tools.ietf.org/html/rfc7230#section-3.3.2 [*Content-Length]] field is present.

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Key	English	Chinese (Simplified Han script)
	`W`	`W`
	A type which meets the requirements of __FieldsWriter__.	满足 __FieldsWriter__ 要求的类型。
	`c.get_method_impl()`	`c.get_method_impl()`
36	`string_view`
	Returns the method text. The implementation only calls this function for request headers when retrieving the method text previously set with a call to `set_method_impl` using a non-empty string.	返回方法文本。仅当使用非空字符串调用 `set_method_impl` 设置了方法文本后，在检索请求头时，实现才会调用此函数。
	`c.get_target_impl()`	`c.get_target_impl()`
	Returns the target string. The implementation only calls this function for request headers.	返回目标字符串。该函数仅在处理请求头时由实现调用。
	`c.get_reason_impl()`	`c.get_reason_impl()`
	Returns the obsolete request text. The implementation only calls this for response headers when retrieving the reason text previously set with a call to `set_reason_impl` using a non-empty string.	返回过时的请求文本。仅当使用非空字符串调用 `set_reason_impl` 设置了原因文本后，在检索响应头时，实现才会调用此函数。
	`c.get_chunked_impl()`	`c.get_chunked_impl()`
36	`bool`
	Returns `true` if the [@https://tools.ietf.org/html/rfc7230#section-3.3.1 [*Transfer-Encoding]] field value indicates that the payload is chunk encoded. Both of these conditions must be true: [itemized_list [ The Transfer-Encoding field is present in the message. ][ The last item in value of the field is "chunked". ]]	如果 [@https://tools.ietf.org/html/rfc7230#section-3.3.1 [*Transfer-Encoding]] 字段值表明负载已进行分块编码，则返回 `true`。必须同时满足以下两个条件：[itemized_list [ 消息中存在 Transfer-Encoding 字段。 ][ 该字段值的最后一项为 "chunked"。 ]]
	`c.get_keep_alive_impl(v)`	`c.get_keep_alive_impl(v)`
	Returns `true` if the semantics of the [@https://tools.ietf.org/html/rfc7230#section-6.1 [*Connection]] field and version indicate that the connection should remain open after the corresponding response is transmitted or received: [itemized_list [ If `(v < 11)` the function returns `true` if the "keep-alive" token is present in the Connection field value. Otherwise the function returns `false`. ][ If `(v == 11)`, the function returns `false` if the "close" token is present in the Connection field value. Otherwise the function returns `true`. ]]	如果 [@https://tools.ietf.org/html/rfc7230#section-6.1 [*Connection]] 字段的语义和版本表明，在发送或接收相应响应后连接应保持打开，则返回 true： [itemized_list [ 如果 (v < 11)，当 Connection 字段值中存在 "keep-alive" 标记时函数返回 true，否则返回 false。 ][ 如果 (v == 11)，当 Connection 字段值中存在 "close" 标记时函数返回 false，否则返回 true。 ]]
	`c.has_content_length()`	`c.has_content_length()`
	Returns `true` if the [@https://tools.ietf.org/html/rfc7230#section-3.3.2 [*Content-Length]] field is present.	如果存在 @https://tools.ietf.org/html/rfc7230#section-3.3.2 [Content-Length] 字段，则返回 true。
	`a.set_method_impl(s)`	`a.set_method_impl(s)`
	Stores a copy of `s` as the method text, or erases the previously stored value if `s` is empty. The implementation only calls this function for request headers. This function may throw `std::invalid_argument` if the operation is not supported by the container.	将 `s` 的副本存储为方法文本；若 `s` 为空，则擦除先前存储的值。此函数仅由实现对请求头进行调用。如果容器不支持该操作，函数可能会抛出 `std::invalid_argument` 异常。
	`a.set_target_impl(s)`	`a.set_target_impl(s)`
	Stores a copy of `s` as the target, or erases the previously stored value if `s` is empty. The implementation only calls this function for request headers. This function may throw `std::invalid_argument` if the operation is not supported by the container.	将 `s` 的副本存储为目标；若 `s` 为空，则擦除先前存储的值。此函数仅由实现对请求头进行调用。如果容器不支持该操作，函数可能会抛出 `std::invalid_argument` 异常。
	`a.set_reason_impl(s)`	`a.set_reason_impl(s)`
	Stores a copy of `s` as the reason text, or erases the previously stored value of the reason text if `s` is empty. The implementation only calls this function for request headers. This function may throw `std::invalid_argument` if the operation is not supported by the container.	将 `s` 的副本存储为原因文本；若 `s` 为空，则擦除先前存储的原因文本。此函数仅由实现对请求头进行调用。如果容器不支持该操作，函数可能会抛出 `std::invalid_argument` 异常。
	`a.set_chunked_impl(b)`	`a.set_chunked_impl(b)`
	Adjusts the [@https://tools.ietf.org/html/rfc7230#section-3.3.1 [*Transfer-Encoding]] field value as follows: [itemized_list [ If `b` is `true`, the "chunked" token is appended to the list of encodings if it does not already appear last in the list. If the Transfer-Encoding field is absent, the field will be inserted to the container with the value "chunked". ][ If `b` is `false, the "chunked" token is removed from the list of encodings if it appears last in the list. If the result of the removal leaves the list of encodings empty, the Transfer-Encoding field shall not appear when the associated __FieldsWriter__ serializes the fields. ]] If the result of adjusting the field value produces an empty string, the field is removed from the container.	根据 [@https://tools.ietf.org/html/rfc7230#section-3.3.1 [*Transfer-Encoding]] 字段值进行调整： - 如果 `b` 为 `true`，且 "chunked" 标记尚未位于编码列表末尾，则将其追加到列表末尾。如果不存在 Transfer-Encoding 字段，则向容器插入该字段，其值为 "chunked"。 - 如果 `b` 为 `false`，且 "chunked" 标记位于编码列表末尾，则将其从列表中移除。如果移除后编码列表为空，则当关联的 `__FieldsWriter__` 序列化字段时，Transfer-Encoding 字段不应出现。如果调整字段值的结果产生空字符串，则从容器中移除该字段。
	`a.set_content_length_impl(n)`	`a.set_content_length_impl(n)`
	Adjusts the [@https://tools.ietf.org/html/rfc7230#section-3.3.2 [*Content-Length]] field value as follows: [itemized_list [ If `n` contains a value, the Content-Length field will be set to the text representation of the value. Any previous Content-Length fields are removed from the container. ][ If `n` does not contain a value, any present Content-Length fields are removed from the container. ]]	根据 [@https://tools.ietf.org/html/rfc7230#section-3.3.2 [*Content-Length]] 字段值进行如下调整： - 如果 `n` 包含一个值，则将 Content-Length 字段设置为该值的文本表示。从容器中移除任何先前存在的 Content-Length 字段。 - 如果 `n` 不包含值，则从容器中移除任何存在的 Content-Length 字段。
	`a.set_keep_alive_impl(v,b)`	`a.set_keep_alive_impl(v,b)`
	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.	根据 [@https://tools.ietf.org/html/rfc7230#section-6.1 [*Connection]] 字段值以及 `v` 和 `b` 的值进行如下调整。该字段值被视为 [@https://tools.ietf.org/html/rfc7230#section-6.1 ['connection-option]] (rfc7230)。 - 如果 `(v < 11 && b)`，则从字段值中移除所有 "close" 标记，若 "keep-alive" 标记尚不存在，则将其添加到字段值中。 - 如果 `(v < 11 && !b)`，则从字段值中移除所有 "close" 和 "keep-alive" 标记。 - 如果 `(v == 11 && b)`，则从字段值中移除所有 "keep-alive" 和 "close" 标记。 - 如果 `(v == 11 && !b)`，则从字段值中移除所有 "keep-alive" 标记，若 "close" 标记尚不存在，则将其添加到字段值中。如果调整字段值的结果产生空字符串，则从容器中移除该字段。
	Exemplar	示例
	Models	模型
	* [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`]

Key	English	Chinese (Simplified Han script)
	`a.set_content_length_impl(n)`	`a.set_content_length_impl(n)`
	Fields	字段
	Associated Types	关联类型
	Returns the obsolete request text. The implementation only calls this for response headers when retrieving the reason text previously set with a call to `set_reason_impl` using a non-empty string.	返回过时的请求文本。仅当使用非空字符串调用 `set_reason_impl` 设置了原因文本后，在检索响应头时，实现才会调用此函数。
	`c.get_chunked_impl()`	`c.get_chunked_impl()`
	* [link beast.ref.boost__beast__http__is_fields `is_fields`] * __FieldsWriter__	* [link beast.ref.boost__beast__http__is_fields `is_fields`] * __FieldsWriter__
	In this table:	在下表中:
	Returns the target string. The implementation only calls this function for request headers.	返回目标字符串。该函数仅在处理请求头时由实现调用。
	Stores a copy of `s` as the reason text, or erases the previously stored value of the reason text if `s` is empty. The implementation only calls this function for request headers. This function may throw `std::invalid_argument` if the operation is not supported by the container.	将 `s` 的副本存储为原因文本；若 `s` 为空，则擦除先前存储的原因文本。此函数仅由实现对请求头进行调用。如果容器不支持该操作，函数可能会抛出 `std::invalid_argument` 异常。
	Adjusts the [@https://tools.ietf.org/html/rfc7230#section-3.3.1 [*Transfer-Encoding]] field value as follows: [itemized_list [ If `b` is `true`, the "chunked" token is appended to the list of encodings if it does not already appear last in the list. If the Transfer-Encoding field is absent, the field will be inserted to the container with the value "chunked". ][ If `b` is `false, the "chunked" token is removed from the list of encodings if it appears last in the list. If the result of the removal leaves the list of encodings empty, the Transfer-Encoding field shall not appear when the associated __FieldsWriter__ serializes the fields. ]] If the result of adjusting the field value produces an empty string, the field is removed from the container.	根据 [@https://tools.ietf.org/html/rfc7230#section-3.3.1 [*Transfer-Encoding]] 字段值进行调整： - 如果 `b` 为 `true`，且 "chunked" 标记尚未位于编码列表末尾，则将其追加到列表末尾。如果不存在 Transfer-Encoding 字段，则向容器插入该字段，其值为 "chunked"。 - 如果 `b` 为 `false`，且 "chunked" 标记位于编码列表末尾，则将其从列表中移除。如果移除后编码列表为空，则当关联的 `__FieldsWriter__` 序列化字段时，Transfer-Encoding 字段不应出现。如果调整字段值的结果产生空字符串，则从容器中移除该字段。
	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.	根据 [@https://tools.ietf.org/html/rfc7230#section-6.1 [*Connection]] 字段值以及 `v` 和 `b` 的值进行如下调整。该字段值被视为 [@https://tools.ietf.org/html/rfc7230#section-6.1 ['connection-option]] (rfc7230)。 - 如果 `(v < 11 && b)`，则从字段值中移除所有 "close" 标记，若 "keep-alive" 标记尚不存在，则将其添加到字段值中。 - 如果 `(v < 11 && !b)`，则从字段值中移除所有 "close" 和 "keep-alive" 标记。 - 如果 `(v == 11 && b)`，则从字段值中移除所有 "keep-alive" 和 "close" 标记。 - 如果 `(v == 11 && !b)`，则从字段值中移除所有 "keep-alive" 标记，若 "close" 标记尚不存在，则将其添加到字段值中。如果调整字段值的结果产生空字符串，则从容器中移除该字段。
	Exemplar	示例
	Models	模型
	* [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`]
	Returns `true` if the [@https://tools.ietf.org/html/rfc7230#section-3.3.1 [*Transfer-Encoding]] field value indicates that the payload is chunk encoded. Both of these conditions must be true: [itemized_list [ The Transfer-Encoding field is present in the message. ][ The last item in value of the field is "chunked". ]]	如果 [@https://tools.ietf.org/html/rfc7230#section-3.3.1 [*Transfer-Encoding]] 字段值表明负载已进行分块编码，则返回 `true`。必须同时满足以下两个条件：[itemized_list [ 消息中存在 Transfer-Encoding 字段。 ][ 该字段值的最后一项为 "chunked"。 ]]
	`c.get_keep_alive_impl(v)`	`c.get_keep_alive_impl(v)`
	Returns `true` if the semantics of the [@https://tools.ietf.org/html/rfc7230#section-6.1 [*Connection]] field and version indicate that the connection should remain open after the corresponding response is transmitted or received: [itemized_list [ If `(v < 11)` the function returns `true` if the "keep-alive" token is present in the Connection field value. Otherwise the function returns `false`. ][ If `(v == 11)`, the function returns `false` if the "close" token is present in the Connection field value. Otherwise the function returns `true`. ]]	如果 [@https://tools.ietf.org/html/rfc7230#section-6.1 [*Connection]] 字段的语义和版本表明，在发送或接收相应响应后连接应保持打开，则返回 true： [itemized_list [ 如果 (v < 11)，当 Connection 字段值中存在 "keep-alive" 标记时函数返回 true，否则返回 false。 ][ 如果 (v == 11)，当 Connection 字段值中存在 "close" 标记时函数返回 false，否则返回 true。 ]]
	`c.has_content_length()`	`c.has_content_length()`
	Returns `true` if the [@https://tools.ietf.org/html/rfc7230#section-3.3.2 [*Content-Length]] field is present.	如果存在 @https://tools.ietf.org/html/rfc7230#section-3.3.2 [Content-Length] 字段，则返回 true。
	`a.set_method_impl(s)`	`a.set_method_impl(s)`
	Stores a copy of `s` as the method text, or erases the previously stored value if `s` is empty. The implementation only calls this function for request headers. This function may throw `std::invalid_argument` if the operation is not supported by the container.	将 `s` 的副本存储为方法文本；若 `s` 为空，则擦除先前存储的值。此函数仅由实现对请求头进行调用。如果容器不支持该操作，函数可能会抛出 `std::invalid_argument` 异常。
36	`string_view`
36	`bool`

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Translation changed

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Chinese (Simplified Han script) 38 characters editedCurrent translationState: Translated

06/18/2026

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String added in the repository

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Chinese (Simplified Han script) 110 characters editedPrevious translationState: Needs editing (Needs rewriting)

06/05/2026

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Glossary

English	Chinese (Simplified Han script)
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type: table cell

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58766

Source string location

string ID 36

String age

06/05/2026

Last updated

06/26/2026

Source string age

06/05/2026

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doc/qbk/07_concepts/Fields_zh_Hans.qbk, string 28

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