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type: table cell
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.
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Returns the target string. The implementation only calls this function for request headers.
Returns the target string. The implementation only calls this function for request headers.
`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.
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.
`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". ]]
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". ]]
`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`. ]]
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()`
`c.has_content_length()`
Returns `true` if the [@https://tools.ietf.org/html/rfc7230#section-3.3.2 [*Content-Length]] field is present.
Returns `true` if the [@https://tools.ietf.org/html/rfc7230#section-3.3.2 [*Content-Length]] field is present.
`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.
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)`
`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.
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)`
`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.
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)`
`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.
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)`
`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. ]]
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)`
`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.
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
Exemplar
Models
Models
* [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`]
English Chinese (Simplified Han script) Actions
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.
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)`
`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.
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)`
`a.set_chunked_impl(b)`
* `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 `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.
Valid expressions
Valid expressions
Expression
Expression
Type
Type
Semantics, Pre/Post-conditions
Semantics, Pre/Post-conditions
`F::writer`
`F::writer`
`W`
`W`
A type which meets the requirements of __FieldsWriter__.
A type which meets the requirements of __FieldsWriter__.
`c.get_method_impl()`
`c.get_method_impl()`
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.
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.
`c.get_target_impl()`
`c.get_target_impl()`
Models
Models
* [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`]

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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.
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.
06/05/2026
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English Chinese (Simplified Han script)
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String information

Source string description
type: table cell
Unit identifier
58772
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_zh_Hans.qbk, string 34