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`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`. ]]
`c.has_content_length()`
Returns `true` if the [@https://tools.ietf.org/html/rfc7230#section-3.3.2 [*Content-Length]] field is present.
`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.
`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.
`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.
`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.
`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. ]]
`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.
Exemplar
Models
* [link beast.ref.boost__beast__http__basic_fields `basic_fields`]
* [link beast.ref.boost__beast__http__fields `fields`]
Key English Actions
Exemplar
`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.
`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`. ]]
`c.has_content_length()`
Returns `true` if the [@https://tools.ietf.org/html/rfc7230#section-3.3.2 [*Content-Length]] field is present.
`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.
`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.
`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.
`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.
`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. ]]
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36
`string_view`

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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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String information

Component
Boost Beast Translation (zh_Hans)/Doc / Qbk / 07 Concepts / Fields (qbk)
Source string description
type: table cell
Flags
read-only
Unit identifier
56425
Source string location
string ID 36
String age
06/05/2026
Last updated
06/05/2026
Source string age
06/05/2026
Translation file QuickBook file
doc/qbk/07_concepts/Fields.qbk, string 40