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* Defer the commitment to a __Body__ type until after reading the header.
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10
Parser Stream Operations
解析器流操作
Non-trivial algorithms need to do more than receive entire messages at once, such as:
非平凡算法需要执行的操作不仅限于一次性接收完整消息，该算法需要做更多事，例如：
* Receive the header first and body later.
* 先接收头部，再接收消息体。
* Receive a large body using a fixed-size buffer.
* 使用固定大小缓冲区接收大型消息体。
* Receive a message incrementally: bounded work in each I/O cycle.
* 逐步接收消息：每个 I/O 周期内只处理有限的数据量。
* Defer the commitment to a __Body__ type until after reading the header.
* 在读取头部之后，再确定 __Body__ 类型。
These types of operations require callers to manage the lifetime of associated state, by constructing a class derived from __basic_parser__. Beast comes with the derived instance __parser__ which creates complete __message__ objects using the __basic_fields__ Fields container.
这类操作要求调用方管理相关状态的生命周期，具体方式为构造一个派生自 __basic_parser__ 的类。Beast 提供派生类 __parser__，该类型使用 __basic_fields__ 字段容器来创建完整的 __message__ 对象。
Parser
解析器
29
Name
名称
29
Description
描述
__parser__
__解析器__
/// An HTTP/1 parser for producing a message.
template<
bool isRequest, // `true` to parse an HTTP request
class Body, // The Body type for the resulting message
class Allocator = std::allocator<char>> // The type of allocator for the header
class parser
: public basic_parser<...>;
/// 用于生成消息的 HTTP/1 解析器
template<
bool isRequest, // 若为 true 则解析 HTTP 请求
class Body, // 结果消息的消息体
class Allocator = std::allocator<char>> // 头部所使用的分配器
class parser
: public basic_parser<...>;
[link beast.ref.boost__beast__http__request_parser `request_parser`]
[link beast.ref.boost__beast__http__request_parser `request_parser`]
/// An HTTP/1 parser for producing a request message.
template<class Body, class Allocator = std::allocator<char>>
using request_parser = parser<true, Body, Allocator>;
/// 用于生成请求消息的 HTTP/1 解析器
template<class Body, class Allocator = std::allocator<char>>
using request_parser = parser<true, Body, Allocator>;
[link beast.ref.boost__beast__http__response_parser `response_parser`]
[link beast.ref.boost__beast__http__response_parser `response_parser`]
/// An HTTP/1 parser for producing a response message.
template<class Body, class Allocator = std::allocator<char>>
using response_parser = parser<false, Body, Allocator>;
/// 用于生成响应消息的 HTTP/1 解析器
template<class Body, class Allocator = std::allocator<char>>
using response_parser = parser<false, Body, Allocator>;
The __basic_parser__ and classes derived from it handle octet streams
__basic_parser__ 及其派生类用于处理八位字节流。
The stream operations which work on parsers are:
用于操作解析器的流操作如下：
71
Parser Stream Operations
解析器流操作
71
Name
名称
71
Description
描述
English Chinese (Simplified Han script) Actions
The parser contains a message constructed internally. Arguments passed to the parser's constructor are forwarded into the message container. The caller can access the message inside the parser by calling [link beast.ref.boost__beast__http__parser.get `parser::get`]. If the `Fields` and `Body` types are [*MoveConstructible], the caller can take ownership of the message by calling [link beast.ref.boost__beast__http__parser.release `parser::release`]. In this example we read an HTTP response with a string body using a parser, then print the response:
解析器内部包含一个已构造的消息对象。传入解析器构造函数的参数会转发到消息容器中。调用方可通过 [link beast.ref.boost__beast__http__parser.get `parser::get`] 访问该消息。若 `Fields` 和 `Body` 类型支持移动构造，调用方还可通过 [link beast.ref.boost__beast__http__parser.release `parser::release`] 获取消息的所有权。以下示例使用解析器读取一个包含字符串消息体的 HTTP 响应，并将其打印出来：
Incremental Read __example__
增量读取 __示例__
Non-trivial algorithms need to do more than receive entire messages at once, such as:
非平凡算法需要执行的操作不仅限于一次性接收完整消息，该算法需要做更多事，例如：
* Receive the header first and body later.
* 先接收头部，再接收消息体。
* Receive a large body using a fixed-size buffer.
* 使用固定大小缓冲区接收大型消息体。
* Receive a message incrementally: bounded work in each I/O cycle.
* 逐步接收消息：每个 I/O 周期内只处理有限的数据量。
* Defer the commitment to a __Body__ type until after reading the header.
* 在读取头部之后，再确定 __Body__ 类型。
These types of operations require callers to manage the lifetime of associated state, by constructing a class derived from __basic_parser__. Beast comes with the derived instance __parser__ which creates complete __message__ objects using the __basic_fields__ Fields container.
这类操作要求调用方管理相关状态的生命周期，具体方式为构造一个派生自 __basic_parser__ 的类。Beast 提供派生类 __parser__，该类型使用 __basic_fields__ 字段容器来创建完整的 __message__ 对象。
Parser
解析器
__parser__
__解析器__
/// An HTTP/1 parser for producing a message.
template<
bool isRequest, // `true` to parse an HTTP request
class Body, // The Body type for the resulting message
class Allocator = std::allocator<char>> // The type of allocator for the header
class parser
: public basic_parser<...>;
/// 用于生成消息的 HTTP/1 解析器
template<
bool isRequest, // 若为 true 则解析 HTTP 请求
class Body, // 结果消息的消息体
class Allocator = std::allocator<char>> // 头部所使用的分配器
class parser
: public basic_parser<...>;
[link beast.ref.boost__beast__http__request_parser `request_parser`]
[link beast.ref.boost__beast__http__request_parser `request_parser`]
/// An HTTP/1 parser for producing a request message.
template<class Body, class Allocator = std::allocator<char>>
using request_parser = parser<true, Body, Allocator>;
/// 用于生成请求消息的 HTTP/1 解析器
template<class Body, class Allocator = std::allocator<char>>
using request_parser = parser<true, Body, Allocator>;
[link beast.ref.boost__beast__http__response_parser `response_parser`]
[link beast.ref.boost__beast__http__response_parser `response_parser`]
/// An HTTP/1 parser for producing a response message.
template<class Body, class Allocator = std::allocator<char>>
using response_parser = parser<false, Body, Allocator>;
/// 用于生成响应消息的 HTTP/1 解析器
template<class Body, class Allocator = std::allocator<char>>
using response_parser = parser<false, Body, Allocator>;
The __basic_parser__ and classes derived from it handle octet streams
__basic_parser__ 及其派生类用于处理八位字节流。
The stream operations which work on parsers are:
用于操作解析器的流操作如下：
[link beast.ref.boost__beast__http__read.overload1 [*read]]
[link beast.ref.boost__beast__http__read.overload1 [*read]]
Read everything into a parser from a __SyncReadStream__.
从 __SyncReadStream__ 读取所有数据到解析器。
[link beast.ref.boost__beast__http__async_read.overload1 [*async_read]]
[link beast.ref.boost__beast__http__async_read.overload1 [*async_read]]
Read everything into a parser asynchronously from an __AsyncReadStream__.
从 __AsyncReadStream__ 异步读取所有数据到解析器。
[link beast.ref.boost__beast__http__async_read_some [*async_read_some]]
[link beast.ref.boost__beast__http__async_read_some [*async_read_some]]
Read some octets into a parser asynchronously from an __AsyncReadStream__.
从 __AsyncReadStream__ 异步读取部分八位字节到解析器。
As with message stream operations, parser stream operations require a persisted __DynamicBuffer__ for holding unused octets from the stream. The basic parser implementation is optimized for the case where this dynamic buffer stores its input sequence in a single contiguous memory buffer. It is advised to use an instance of __flat_buffer__, __flat_static_buffer__, or __flat_static_buffer_base__ for this purpose, although a user defined instance of __DynamicBuffer__ which produces input sequences of length one is also suitable.
与消息流操作类似，解析器流操作也需要一个持久的 DynamicBuffer 来保存流中未使用的八位字节。当动态缓冲区使用单个连续内存块存储输入序列时，基本解析器实现能达到最优性能。因此，建议使用 flat_buffer、flat_static_buffer 或 flat_static_buffer_base 的实例；当然，用户自定义的 DynamicBuffer 实现，只要它能生成长度为 1 的输入序列，也同样适用。
This function uses [link beast.ref.boost__beast__http__buffer_body `buffer_body`] and parser stream operations to read a message body progressively using a small, fixed-size buffer:
该函数使用 [link beast.ref.boost__beast__http__buffer_body `buffer_body`] 和解析器流操作，通过一个固定大小的小缓冲区逐步读取消息体：
Reading large response body __example__
读取大型响应消息体 __示例__
This example presents how to increase the default limit of the response body size, thus the content larger than the default 8MB can be read.
本示例展示如何提高响应消息体大小的默认限制，以便读取超过默认 8MB 大小的内容。

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User avatar Bstran

Translation changed
* Defer the commitment to a __Body__ type until after reading the header.
* Defer the commitment to a __Body__ type until after reading the header.在读取头部之后，再确定 __Body__ 类型。
06/16/2026
User avatar admin

String added in the repository
* Defer the commitment to a __Body__ type until after reading the header.
* Defer the commitment to a __Body__ type until after reading the header.
06/05/2026
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String information

Source string description
type: list
Unit identifier
58174
Source string location
string ID 22
String age
06/05/2026
Last updated
06/26/2026
Source string age
06/05/2026
Translation file QuickBook file
doc/qbk/04_http/05_parser_streams_zh_Hans.qbk, string 6