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].\n* `F` denotes a __Fields__ where * `a` is a value of type `W`.\n* `f` is a value of type `F`.\n* `v` is an `unsigned` value representing the HTTP version.\n* `c` is an `unsigned` representing the HTTP status-code.\n* `m` is a value of type [link beast.ref.boost__beast__http__verb `verb`]. Valid expressions expression type semantics, pre/post-conditions `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\"`).\n\nCopies 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 Models * [link beast.ref.boost__beast__http__basic_fields.writer `basic_fields::writer`]