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Called once to fully initialize the object before any calls to `put`. The message body is valid before entering this function, and remains valid until the reader is destroyed. The value of `n` will be set to the content length of the body if known, otherwise `n` will be equal to `boost::none`. Implementations of [*BodyReader] may use this information to optimize allocation.

The function will ensure that `!ec` is `true` if there was no error or set to the appropriate error code if there was one.
Called once to fully initialize the object before any calls to `put`. The message body is valid before entering this function, and remains valid until the reader is destroyed. The value of `n` will be set to the content length of the body if known, otherwise `n` will be equal to `boost::none`. Implementations of [*BodyReader] may use this information to optimize allocation.

The function will ensure that `!ec` is `true` if there was no error or set to the appropriate error code if there was one.
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`a.init(n, ec)`
`a.init(n, ec)`
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Constructible from `h` and `v`. The lifetime of `h` and `v` is guaranteed to end no earlier than after the `R` is destroyed. The reader shall not access the contents of `h` or `v` before the first call to `init`, permitting lazy construction of the message.
Constructible from `h` and `v`. The lifetime of `h` and `v` is guaranteed to end no earlier than after the `R` is destroyed. The reader shall not access the contents of `h` or `v` before the first call to `init`, permitting lazy construction of the message.
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`R{h,v};`
`R{h,v};`
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Semantics, Pre/Post-conditions
Semantics, Pre/Post-conditions
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Type
Type
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Expression
Expression
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Valid expressions
Valid expressions
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* `a` denotes a value of type `R`.
* `b` is an object whose type meets the requirements of __ConstBufferSequence__
* `h` denotes a value of type `header<isRequest, Fields>&`.
* `v` denotes a value of type `Body::value_type&`.
* `n` is a value of type `boost::optional<std::uint64_t>`.
* `ec` is a value of type [link beast.ref.boost__beast__error_code `error_code&`].
* `a` denotes a value of type `R`.
* `b` is an object whose type meets the requirements of __ConstBufferSequence__
* `h` denotes a value of type `header<isRequest, Fields>&`.
* `v` denotes a value of type `Body::value_type&`.
* `n` is a value of type `boost::optional<std::uint64_t>`.
* `ec` is a value of type [link beast.ref.boost__beast__error_code `error_code&`].
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* `R` denotes a type meeting the requirements of [*BodyReader].
* `B` denotes a __Body__ where
* `R` denotes a type meeting the requirements of [*BodyReader].
* `B` denotes a __Body__ where
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In this table:
In this table:
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These requirements may undergo non-backward compatible
These requirements may undergo non-backward compatible
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Requirements
Requirements
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* [link beast.ref.boost__beast__http__is_body_reader `is_body_reader`]
* __Body__
* [link beast.ref.boost__beast__http__is_body_reader `is_body_reader`]
* __Body__
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Associated Types
Associated Types
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* Saving body data to a file
* Saving body data to a file
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* Storing a body in a dynamic buffer
* Storing a body in a user defined container with a custom allocator
* Transformation of incoming body data before storage, for example
* Storing a body in a dynamic buffer
* Storing a body in a user defined container with a custom allocator
* Transformation of incoming body data before storage, for example
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A [*BodyReader] provides an online algorithm to transfer a series of zero or more buffers containing parsed body octets into a message container. The __parser__ creates an instance of this type when needed, and calls into it zero or more times to transfer buffers. The interface of [*BodyReader] is intended to allow the conversion of buffers into these scenarios for representation:
A [*BodyReader] provides an online algorithm to transfer a series of zero or more buffers containing parsed body octets into a message container. The __parser__ creates an instance of this type when needed, and calls into it zero or more times to transfer buffers. The interface of [*BodyReader] is intended to allow the conversion of buffers into these scenarios for representation:
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BodyReader
BodyReader
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Component created
Component created (boost_endpoint) 06/05/2026

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