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* `F` is a [*File] type
* `f` is an instance of `F`
* `p` is a value of type `char const*` which points to a null
* `F` is a [*File] type
* `f` is an instance of `F`
* `p` is a value of type `char const*` which points to a null
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In this table:
In this table:
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Requirements
Requirements
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* [link beast.ref.boost__beast__file_mode `file_mode`]
* [link beast.ref.boost__beast__is_file `is_file`]
* [link beast.ref.boost__beast__file_mode `file_mode`]
* [link beast.ref.boost__beast__is_file `is_file`]
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Associated Types
Associated Types
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The [*File] concept abstracts access to files in the underlying file system. To support other platform interfaces, users may author their own [*File] types which meet these requirements.
The [*File] concept abstracts access to files in the underlying file system. To support other platform interfaces, users may author their own [*File] types which meet these requirements.
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File
File
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File “doc/qbk/07_concepts/Body_zh_Hans.qbk” was added. 06/05/2026
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* [link beast.ref.boost__beast__http__basic_dynamic_body `basic_dynamic_body`]
* [link beast.ref.boost__beast__http__basic_file_body `basic_file_body`]
* [link beast.ref.boost__beast__http__basic_string_body `basic_string_body`]
* [link beast.ref.boost__beast__http__buffer_body `buffer_body`]
* [link beast.ref.boost__beast__http__empty_body `empty_body`]
* [link beast.ref.boost__beast__http__span_body `span_body`]
* [link beast.ref.boost__beast__http__vector_body `vector_body`]
* [link beast.ref.boost__beast__http__basic_dynamic_body `basic_dynamic_body`]
* [link beast.ref.boost__beast__http__basic_file_body `basic_file_body`]
* [link beast.ref.boost__beast__http__basic_string_body `basic_string_body`]
* [link beast.ref.boost__beast__http__buffer_body `buffer_body`]
* [link beast.ref.boost__beast__http__empty_body `empty_body`]
* [link beast.ref.boost__beast__http__span_body `span_body`]
* [link beast.ref.boost__beast__http__vector_body `vector_body`]
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Models
Models
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Exemplar
Exemplar
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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.
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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`std::uint64_t`
`std::uint64_t`
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B::size(
B::value_type body)
B::size(
B::value_type body)
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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.
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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`B::writer`
`B::writer`
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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.
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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`B::reader`
`B::reader`
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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.
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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`B::value_type`
`B::value_type`
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