Exit Zen
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Associated Types
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* [link beast.ref.boost__beast__http__is_body `is_body`]
* __BodyReader__
* __BodyWriter__
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string ID 22
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Requirements
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In this table:
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* `B` is a type meeting the requirements of [*Body].
* `m` is a value of type `message<b,B,F>` where `b` is a `bool` value
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Valid expressions
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Expression
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Type
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Semantics, Pre/Post-conditions
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`B::value_type`
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The return type of the `message::body` member function. If this is not movable or not copyable, the containing message will be not movable or not copyable.
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string ID 30
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`B::reader`
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string ID 30
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If present, indicates that the body can be parsed. The type must meet the requirements of __BodyReader__. The implementation constructs an object of this type to obtain buffers into which parsed body octets are placed.
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string ID 30
type: table cell
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`B::writer`
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string ID 30
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If present, indicates that the body is serializable. The type must meet the requirements of __BodyWriter__. The implementation constructs an object of this type to obtain buffers representing the message body for serialization.
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string ID 30
type: table code
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B::size(
B::value_type body)
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string ID 30
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`std::uint64_t`
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string ID 30
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This static member function is optional. It returns the payload size of `body` in bytes not including any chunked transfer encoding. The return value may be zero, to indicate that the message is known to have no payload. The function shall not exit via an exception.

When this function is present:

* The function shall not fail

* A call to [link beast.ref.boost__beast__http__message.payload_size `message::payload_size`] will return the same value as `size`.

* A call to [link beast.ref.boost__beast__http__message.prepare_payload `message::prepare_payload`] will remove "chunked" from the Transfer-Encoding field if it appears as the last encoding, and will set the Content-Length field to the returned value.

Otherwise, when the function is omitted:

* A call to [link beast.ref.boost__beast__http__message.payload_size `message::payload_size`] will return `boost::none`.

* A call to [link beast.ref.boost__beast__http__message.prepare_payload `message::prepare_payload`] will erase the Content-Length field, and add "chunked" as the last encoding in the Transfer-Encoding field if it is not already present.
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Exemplar
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Models
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