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Until now parse and serialize operations apply or remove the chunked transfer coding as needed for message payloads whose size is not known ahead of time. For some domain specific niches, it is necessary to assume direct control over incoming or outgoing chunks in a chunk encoded message payload. For parsing this is achieved by setting hooks using the functions [link beast.ref.boost__beast__http__parser.on_chunk_header `on_chunk_header`] and/or [link beast.ref.boost__beast__http__parser.on_chunk_body `on_chunk_body`]. For serializing callers may first emit the header, and then use these buffer sequence adapters to control the contents of each chunk including [@https://tools.ietf.org/html/rfc7230#section-4.1.1 ['chunk extensions]] and the [@https://tools.ietf.org/html/rfc7230#section-4.1.2 ['trailer-part]]: [link beast.ref.boost__beast__http__chunk_body `chunk_body`], [link beast.ref.boost__beast__http__chunk_crlf `chunk_crlf`], [link beast.ref.boost__beast__http__chunk_header `chunk_header`], and [link beast.ref.boost__beast__http__chunk_last `chunk_last`].
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Interfaces for operating on HTTP messages are structured into several layers. The highest level provides ease of use, while lower levels provide progressively more control, options, and flexibility. At the lowest level customization points are provided, where user defined types can replace parts of the implementation. The layers are arranged thusly:
Interfaces for operating on HTTP messages are structured into several layers. The highest level provides ease of use, while lower levels provide progressively more control, options, and flexibility. At the lowest level customization points are provided, where user defined types can replace parts of the implementation. The layers are arranged thusly:
[*6]
[*6]
__message__
__message__
At the highest level, these free functions send or receive a complete HTTP message in one call. They are designed for ease of use: [link beast.ref.boost__beast__http__read.overload4 `read`], [link beast.ref.boost__beast__http__write.overload4 `write`], [link beast.ref.boost__beast__http__async_read.overload2 `async_read`], and [link beast.ref.boost__beast__http__async_write.overload2 `async_write`].
At the highest level, these free functions send or receive a complete HTTP message in one call. They are designed for ease of use: [link beast.ref.boost__beast__http__read.overload4 `read`], [link beast.ref.boost__beast__http__write.overload4 `write`], [link beast.ref.boost__beast__http__async_read.overload2 `async_read`], and [link beast.ref.boost__beast__http__async_write.overload2 `async_write`].
[*5]
[*5]
__parser__, __serializer__
__parser__, __serializer__
For more control, callers may take responsibility for managing the required __parser__ or __serializer__ transient state objects. This allows additional configuration such as limiting the number of bytes for message components during parsing, or regulating the size of buffers emitted during output. These functions send or receive complete messages using a serializer or parser: [link beast.ref.boost__beast__http__read.overload2 `read`], [link beast.ref.boost__beast__http__write.overload2 `write`], [link beast.ref.boost__beast__http__async_read.overload1 `async_read`], and [link beast.ref.boost__beast__http__async_write.overload1 `async_write`].
For more control, callers may take responsibility for managing the required __parser__ or __serializer__ transient state objects. This allows additional configuration such as limiting the number of bytes for message components during parsing, or regulating the size of buffers emitted during output. These functions send or receive complete messages using a serializer or parser: [link beast.ref.boost__beast__http__read.overload2 `read`], [link beast.ref.boost__beast__http__write.overload2 `write`], [link beast.ref.boost__beast__http__async_read.overload1 `async_read`], and [link beast.ref.boost__beast__http__async_write.overload1 `async_write`].
[*4]
[*4]
__header__
__header__
Sometimes it is necessary to first send or receive the HTTP header. For example, to read the header and take action before continuing to read the body. These functions use a __parser__ or __serializer__ to read or write the header: [link beast.ref.boost__beast__http__read_header.overload2 `read_header`], [link beast.ref.boost__beast__http__write_header.overload2 `write_header`], [link beast.ref.boost__beast__http__async_read_header `async_read_header`], and [link beast.ref.boost__beast__http__async_write_header `async_write_header`].
Sometimes it is necessary to first send or receive the HTTP header. For example, to read the header and take action before continuing to read the body. These functions use a __parser__ or __serializer__ to read or write the header: [link beast.ref.boost__beast__http__read_header.overload2 `read_header`], [link beast.ref.boost__beast__http__write_header.overload2 `write_header`], [link beast.ref.boost__beast__http__async_read_header `async_read_header`], and [link beast.ref.boost__beast__http__async_write_header `async_write_header`].
[*3]
[*3]
partial __message__
partial __message__
All of the stream operations at higher levels thus far have operated on a complete header or message. At this level it is possible to send and receive messages incrementally. This allows resource constrained implementations to perform work bounded on storage, or allows better control when setting timeouts for example. These functions read or write bounded amounts of data and return the number of bytes transacted: [link beast.ref.boost__beast__http__read_some.overload2 `read_some`], [link beast.ref.boost__beast__http__write_some.overload2 `write_some`], [link beast.ref.boost__beast__http__async_read_some `async_read_some`], and [link beast.ref.boost__beast__http__async_write_some `async_write_some`].
All of the stream operations at higher levels thus far have operated on a complete header or message. At this level it is possible to send and receive messages incrementally. This allows resource constrained implementations to perform work bounded on storage, or allows better control when setting timeouts for example. These functions read or write bounded amounts of data and return the number of bytes transacted: [link beast.ref.boost__beast__http__read_some.overload2 `read_some`], [link beast.ref.boost__beast__http__write_some.overload2 `write_some`], [link beast.ref.boost__beast__http__async_read_some `async_read_some`], and [link beast.ref.boost__beast__http__async_write_some `async_write_some`].
[*2]
[*2]
[@https://tools.ietf.org/html/rfc7230#section-4.1 ['chunked-body]]
[@https://tools.ietf.org/html/rfc7230#section-4.1 ['chunked-body]]
Until now parse and serialize operations apply or remove the chunked transfer coding as needed for message payloads whose size is not known ahead of time. For some domain specific niches, it is necessary to assume direct control over incoming or outgoing chunks in a chunk encoded message payload. For parsing this is achieved by setting hooks using the functions [link beast.ref.boost__beast__http__parser.on_chunk_header `on_chunk_header`] and/or [link beast.ref.boost__beast__http__parser.on_chunk_body `on_chunk_body`]. For serializing callers may first emit the header, and then use these buffer sequence adapters to control the contents of each chunk including [@https://tools.ietf.org/html/rfc7230#section-4.1.1 ['chunk extensions]] and the [@https://tools.ietf.org/html/rfc7230#section-4.1.2 ['trailer-part]]: [link beast.ref.boost__beast__http__chunk_body `chunk_body`], [link beast.ref.boost__beast__http__chunk_crlf `chunk_crlf`], [link beast.ref.boost__beast__http__chunk_header `chunk_header`], and [link beast.ref.boost__beast__http__chunk_last `chunk_last`].
Until now parse and serialize operations apply or remove the chunked transfer coding as needed for message payloads whose size is not known ahead of time. For some domain specific niches, it is necessary to assume direct control over incoming or outgoing chunks in a chunk encoded message payload. For parsing this is achieved by setting hooks using the functions [link beast.ref.boost__beast__http__parser.on_chunk_header `on_chunk_header`] and/or [link beast.ref.boost__beast__http__parser.on_chunk_body `on_chunk_body`]. For serializing callers may first emit the header, and then use these buffer sequence adapters to control the contents of each chunk including [@https://tools.ietf.org/html/rfc7230#section-4.1.1 ['chunk extensions]] and the [@https://tools.ietf.org/html/rfc7230#section-4.1.2 ['trailer-part]]: [link beast.ref.boost__beast__http__chunk_body `chunk_body`], [link beast.ref.boost__beast__http__chunk_crlf `chunk_crlf`], [link beast.ref.boost__beast__http__chunk_header `chunk_header`], and [link beast.ref.boost__beast__http__chunk_last `chunk_last`].
[*1]
[*1]
buffers
buffers
For ultimate control, the use of library stream algorithms may be bypassed entirely and instead work directly with buffers by calling members of __parser__ or __serializer__.
For ultimate control, the use of library stream algorithms may be bypassed entirely and instead work directly with buffers by calling members of __parser__ or __serializer__.
[*0]
[*0]
['user-defined]
['user-defined]
In addition to the typical customization points of __Stream__ and __DynamicBuffer__, user-defined types may replace parts of the library implementation at the lowest level. The customization points include __Fields__ for creating a container to store HTTP fields, __Body__ for defining containers and algorithms used for HTTP message payloads, and user-defined subclasses of __basic_parser__ for implementing custom message representation strategies.
In addition to the typical customization points of __Stream__ and __DynamicBuffer__, user-defined types may replace parts of the library implementation at the lowest level. The customization points include __Fields__ for creating a container to store HTTP fields, __Body__ for defining containers and algorithms used for HTTP message payloads, and user-defined subclasses of __basic_parser__ for implementing custom message representation strategies.
This documentation assumes some familiarity with __Asio__ and
This documentation assumes some familiarity with __Asio__ and
English Chinese (Simplified Han script) Actions
HTTP
HTTP
Higher level functions such as Basic
Higher level functions such as Basic
This library offers programmers simple and performant models of HTTP messages and their associated operations including synchronous, asynchronous, and buffer-oriented parsing and serialization of messages in the HTTP/1 wire format using __Asio__. Specifically, the library provides:
This library offers programmers simple and performant models of HTTP messages and their associated operations including synchronous, asynchronous, and buffer-oriented parsing and serialization of messages in the HTTP/1 wire format using __Asio__. Specifically, the library provides:
Stream Reading
Stream Reading
The functions [link beast.ref.boost__beast__http__read `read`], [link beast.ref.boost__beast__http__read_header `read_header`], [link beast.ref.boost__beast__http__read_some `read_some`], [link beast.ref.boost__beast__http__async_read `async_read`], [link beast.ref.boost__beast__http__async_read_header `async_read_header`], and [link beast.ref.boost__beast__http__async_read_some `async_read_some`] read HTTP/1 message data from a [link beast.concepts.streams stream].
The functions [link beast.ref.boost__beast__http__read `read`], [link beast.ref.boost__beast__http__read_header `read_header`], [link beast.ref.boost__beast__http__read_some `read_some`], [link beast.ref.boost__beast__http__async_read `async_read`], [link beast.ref.boost__beast__http__async_read_header `async_read_header`], and [link beast.ref.boost__beast__http__async_read_some `async_read_some`] read HTTP/1 message data from a [link beast.concepts.streams stream].
Stream Writing
Stream Writing
For more control, callers may take responsibility for managing the required __parser__ or __serializer__ transient state objects. This allows additional configuration such as limiting the number of bytes for message components during parsing, or regulating the size of buffers emitted during output. These functions send or receive complete messages using a serializer or parser: [link beast.ref.boost__beast__http__read.overload2 `read`], [link beast.ref.boost__beast__http__write.overload2 `write`], [link beast.ref.boost__beast__http__async_read.overload1 `async_read`], and [link beast.ref.boost__beast__http__async_write.overload1 `async_write`].
For more control, callers may take responsibility for managing the required __parser__ or __serializer__ transient state objects. This allows additional configuration such as limiting the number of bytes for message components during parsing, or regulating the size of buffers emitted during output. These functions send or receive complete messages using a serializer or parser: [link beast.ref.boost__beast__http__read.overload2 `read`], [link beast.ref.boost__beast__http__write.overload2 `write`], [link beast.ref.boost__beast__http__async_read.overload1 `async_read`], and [link beast.ref.boost__beast__http__async_write.overload1 `async_write`].
[*4]
[*4]
__header__
__header__
Sometimes it is necessary to first send or receive the HTTP header. For example, to read the header and take action before continuing to read the body. These functions use a __parser__ or __serializer__ to read or write the header: [link beast.ref.boost__beast__http__read_header.overload2 `read_header`], [link beast.ref.boost__beast__http__write_header.overload2 `write_header`], [link beast.ref.boost__beast__http__async_read_header `async_read_header`], and [link beast.ref.boost__beast__http__async_write_header `async_write_header`].
Sometimes it is necessary to first send or receive the HTTP header. For example, to read the header and take action before continuing to read the body. These functions use a __parser__ or __serializer__ to read or write the header: [link beast.ref.boost__beast__http__read_header.overload2 `read_header`], [link beast.ref.boost__beast__http__write_header.overload2 `write_header`], [link beast.ref.boost__beast__http__async_read_header `async_read_header`], and [link beast.ref.boost__beast__http__async_write_header `async_write_header`].
[*3]
[*3]
partial __message__
partial __message__
All of the stream operations at higher levels thus far have operated on a complete header or message. At this level it is possible to send and receive messages incrementally. This allows resource constrained implementations to perform work bounded on storage, or allows better control when setting timeouts for example. These functions read or write bounded amounts of data and return the number of bytes transacted: [link beast.ref.boost__beast__http__read_some.overload2 `read_some`], [link beast.ref.boost__beast__http__write_some.overload2 `write_some`], [link beast.ref.boost__beast__http__async_read_some `async_read_some`], and [link beast.ref.boost__beast__http__async_write_some `async_write_some`].
All of the stream operations at higher levels thus far have operated on a complete header or message. At this level it is possible to send and receive messages incrementally. This allows resource constrained implementations to perform work bounded on storage, or allows better control when setting timeouts for example. These functions read or write bounded amounts of data and return the number of bytes transacted: [link beast.ref.boost__beast__http__read_some.overload2 `read_some`], [link beast.ref.boost__beast__http__write_some.overload2 `write_some`], [link beast.ref.boost__beast__http__async_read_some `async_read_some`], and [link beast.ref.boost__beast__http__async_write_some `async_write_some`].
[*2]
[*2]
[@https://tools.ietf.org/html/rfc7230#section-4.1 ['chunked-body]]
[@https://tools.ietf.org/html/rfc7230#section-4.1 ['chunked-body]]
Until now parse and serialize operations apply or remove the chunked transfer coding as needed for message payloads whose size is not known ahead of time. For some domain specific niches, it is necessary to assume direct control over incoming or outgoing chunks in a chunk encoded message payload. For parsing this is achieved by setting hooks using the functions [link beast.ref.boost__beast__http__parser.on_chunk_header `on_chunk_header`] and/or [link beast.ref.boost__beast__http__parser.on_chunk_body `on_chunk_body`]. For serializing callers may first emit the header, and then use these buffer sequence adapters to control the contents of each chunk including [@https://tools.ietf.org/html/rfc7230#section-4.1.1 ['chunk extensions]] and the [@https://tools.ietf.org/html/rfc7230#section-4.1.2 ['trailer-part]]: [link beast.ref.boost__beast__http__chunk_body `chunk_body`], [link beast.ref.boost__beast__http__chunk_crlf `chunk_crlf`], [link beast.ref.boost__beast__http__chunk_header `chunk_header`], and [link beast.ref.boost__beast__http__chunk_last `chunk_last`].
Until now parse and serialize operations apply or remove the chunked transfer coding as needed for message payloads whose size is not known ahead of time. For some domain specific niches, it is necessary to assume direct control over incoming or outgoing chunks in a chunk encoded message payload. For parsing this is achieved by setting hooks using the functions [link beast.ref.boost__beast__http__parser.on_chunk_header `on_chunk_header`] and/or [link beast.ref.boost__beast__http__parser.on_chunk_body `on_chunk_body`]. For serializing callers may first emit the header, and then use these buffer sequence adapters to control the contents of each chunk including [@https://tools.ietf.org/html/rfc7230#section-4.1.1 ['chunk extensions]] and the [@https://tools.ietf.org/html/rfc7230#section-4.1.2 ['trailer-part]]: [link beast.ref.boost__beast__http__chunk_body `chunk_body`], [link beast.ref.boost__beast__http__chunk_crlf `chunk_crlf`], [link beast.ref.boost__beast__http__chunk_header `chunk_header`], and [link beast.ref.boost__beast__http__chunk_last `chunk_last`].
[*1]
[*1]
buffers
buffers
For ultimate control, the use of library stream algorithms may be bypassed entirely and instead work directly with buffers by calling members of __parser__ or __serializer__.
For ultimate control, the use of library stream algorithms may be bypassed entirely and instead work directly with buffers by calling members of __parser__ or __serializer__.

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Until now parse and serialize operations apply or remove the chunked transfer coding as needed for message payloads whose size is not known ahead of time. For some domain specific niches, it is necessary to assume direct control over incoming or outgoing chunks in a chunk encoded message payload. For parsing this is achieved by setting hooks using the functions [link beast.ref.boost__beast__http__parser.on_chunk_header `on_chunk_header`] and/or [link beast.ref.boost__beast__http__parser.on_chunk_body `on_chunk_body`]. For serializing callers may first emit the header, and then use these buffer sequence adapters to control the contents of each chunk including [@https://tools.ietf.org/html/rfc7230#section-4.1.1 ['chunk extensions]] and the [@https://tools.ietf.org/html/rfc7230#section-4.1.2 ['trailer-part]]: [link beast.ref.boost__beast__http__chunk_body `chunk_body`], [link beast.ref.boost__beast__http__chunk_crlf `chunk_crlf`], [link beast.ref.boost__beast__http__chunk_header `chunk_header`], and [link beast.ref.boost__beast__http__chunk_last `chunk_last`].
Until now parse and serialize operations apply or remove the chunked transfer coding as needed for message payloads whose size is not known ahead of time. For some domain specific niches, it is necessary to assume direct control over incoming or outgoing chunks in a chunk encoded message payload. For parsing this is achieved by setting hooks using the functions [link beast.ref.boost__beast__http__parser.on_chunk_header `on_chunk_header`] and/or [link beast.ref.boost__beast__http__parser.on_chunk_body `on_chunk_body`]. For serializing callers may first emit the header, and then use these buffer sequence adapters to control the contents of each chunk including [@https://tools.ietf.org/html/rfc7230#section-4.1.1 ['chunk extensions]] and the [@https://tools.ietf.org/html/rfc7230#section-4.1.2 ['trailer-part]]: [link beast.ref.boost__beast__http__chunk_body `chunk_body`], [link beast.ref.boost__beast__http__chunk_crlf `chunk_crlf`], [link beast.ref.boost__beast__http__chunk_header `chunk_header`], and [link beast.ref.boost__beast__http__chunk_last `chunk_last`].
06/05/2026
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type: table cell
Unit identifier
58108
Source string location
string ID 80
String age
06/05/2026
Last updated
06/05/2026
Source string age
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Translation file QuickBook file
doc/qbk/04_http/_http_zh_Hans.qbk, string 27