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Key English Actions
FieldsWriter
A [*FieldsWriter] provides a algorithm to obtain a sequence of buffers representing the complete serialized HTTP/1 header for a set of fields. The implementation constructs an instance of this type when needed, and calls into it once to retrieve the buffers.
Associated Types
* __FieldsWriter__
Requirements
These requirements may undergo non-backward compatible
In this table:
* `W` denotes a type that meets the requirements of [*FieldsWriter].
* `F` denotes a __Fields__ where
* `a` is a value of type `W`.
* `f` is a value of type `F`.
* `v` is an `unsigned` value representing the HTTP version.
* `c` is an `unsigned` representing the HTTP status-code.
* `m` is a value of type [link beast.ref.boost__beast__http__verb `verb`].
Valid expressions
expression
type
semantics, pre/post-conditions
39
`W::const_buffers_type`
A type which meets the requirements of __ConstBufferSequence__. This is the type of buffer returned by `W::get`.
`W{f,v,m}`
The implementation calls this constructor to indicate that the fields being serialized form part of an HTTP request. The lifetime of `f` is guaranteed to end no earlier than after the `W` is destroyed.
`W{f,v,c}`
The implementation calls this constructor to indicate that the fields being serialized form part of an HTTP response. The lifetime of `f` is guaranteed to end no earlier than after the `W` is destroyed.
`W{f}`
The implementation calls this constructor to indicate that the fields being serialized form part of a chunked encoding final-chunk trailer. The lifetime of `f` is guaranteed to end no earlier than after the `W` is destroyed.
`a.get()`
Called once after construction, this function returns a constant buffer sequence containing the serialized representation of the HTTP request or response including the final carriage return linefeed sequence (`"\r\n"`).

Copies may be made of the returned sequence, but the underlying memory is still owned by the writer. The implementation will destroy all copies of the buffer sequence before destroying `a`.
Exemplar
English Actions
FieldsWriter
A [*FieldsWriter] provides a algorithm to obtain a sequence of buffers representing the complete serialized HTTP/1 header for a set of fields. The implementation constructs an instance of this type when needed, and calls into it once to retrieve the buffers.
Associated Types
* __FieldsWriter__
Requirements
These requirements may undergo non-backward compatible
In this table:
* `W` denotes a type that meets the requirements of [*FieldsWriter].
* `F` denotes a __Fields__ where
* `a` is a value of type `W`.
* `f` is a value of type `F`.
* `v` is an `unsigned` value representing the HTTP version.
* `c` is an `unsigned` representing the HTTP status-code.
* `m` is a value of type [link beast.ref.boost__beast__http__verb `verb`].
Valid expressions
expression
type
semantics, pre/post-conditions
A type which meets the requirements of __ConstBufferSequence__. This is the type of buffer returned by `W::get`.
`W{f,v,m}`
The implementation calls this constructor to indicate that the fields being serialized form part of an HTTP request. The lifetime of `f` is guaranteed to end no earlier than after the `W` is destroyed.
`W{f,v,c}`
The implementation calls this constructor to indicate that the fields being serialized form part of an HTTP response. The lifetime of `f` is guaranteed to end no earlier than after the `W` is destroyed.
`W{f}`
The implementation calls this constructor to indicate that the fields being serialized form part of a chunked encoding final-chunk trailer. The lifetime of `f` is guaranteed to end no earlier than after the `W` is destroyed.
`a.get()`
Called once after construction, this function returns a constant buffer sequence containing the serialized representation of the HTTP request or response including the final carriage return linefeed sequence (`"\r\n"`).

Copies may be made of the returned sequence, but the underlying memory is still owned by the writer. The implementation will destroy all copies of the buffer sequence before destroying `a`.
* [link beast.ref.boost__beast__http__basic_fields.writer `basic_fields::writer`]

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String added in the repository
* `a` is a value of type `W`.
* `f` is a value of type `F`.
* `v` is an `unsigned` value representing the HTTP version.
* `c` is an `unsigned` representing the HTTP status-code.
* `m` is a value of type [link beast.ref.boost__beast__http__verb `verb`].
* `a` is a value of type `W`.
* `f` is a value of type `F`.
* `v` is an `unsigned` value representing the HTTP version.
* `c` is an `unsigned` representing the HTTP status-code.
* `m` is a value of type [link beast.ref.boost__beast__http__verb `verb`].
06/05/2026
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Glossary

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String information

Component
Boost Beast Translation (zh_Hans)/Doc / Qbk / 07 Concepts / Fieldswriter (qbk)
Source string description
type: list
Flags
read-only
Unit identifier
56305
Source string location
string ID 33
String age
06/05/2026
Last updated
06/05/2026
Source string age
06/05/2026
Translation file QuickBook file
doc/qbk/07_concepts/FieldsWriter.qbk, string 9