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[link beast.ref.boost__beast__http__async_read.overload2 [*async_read]]
[link beast.ref.boost__beast__http__async_read.overload2 [*async_read]]
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Read a __message__ from a __SyncReadStream__.
Read a __message__ from a从 __SyncReadStream__. 读取 __message__。
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[link beast.ref.boost__beast__http__read.overload3 [*read]]
[link beast.ref.boost__beast__http__read.overload3 [*read]]
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Description
Description描述
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Name
Name名称
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Message Stream Operations
Message Stream Operations消息流操作
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Beast provides synchronous and asynchronous algorithms to parse and serialize HTTP/1 wire format messages on streams. These functions form the message-oriented stream interface:
Beast provides synchronous and asynchronous algorithms to parse and serialize HTTP/1 wire format messages on streams. These functions form the message-oriented stream interface:提供同步和异步算法，用于在流上解析和序列化 HTTP/1 线路格式的消息。这些函数构成面向消息的流接口：
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Message Stream Operations
Message Stream Operations消息流操作
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File “doc/qbk/04_http/03_streams_zh_Hans.qbk” was added. 06/05/2026
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The completion handler is called with the number of bytes written to the stream, which includes protocol specific data such as the delimiters in the header and line endings. The number may be used to measure the amount of data transferred, or it may be ignored as in the example.
The completion handler is called with the number of bytes written to the stream, which includes protocol specific data such as the delimiters in the header and line endings. The number may be used to measure the amount of data transferred, or it may be ignored as in the example.
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The asynchronous version could be used instead:
The asynchronous version could be used instead:
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A set of free functions allow serialization of an entire HTTP message to a stream. This example constructs and sends an HTTP response:
A set of free functions allow serialization of an entire HTTP message to a stream. This example constructs and sends an HTTP response:
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Writing
Writing
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If a read stream algorithm cannot complete its operation without exceeding the maximum specified size of the dynamic buffer provided, the error [link beast.ref.boost__beast__http__error `buffer_overflow`] is returned. This is one technique which may be used to impose a limit on the maximum size of an HTTP message header for protection from buffer overflow attacks. The following code will print the error message:
If a read stream algorithm cannot complete its operation without exceeding the maximum specified size of the dynamic buffer provided, the error [link beast.ref.boost__beast__http__error `buffer_overflow`] is returned. This is one technique which may be used to impose a limit on the maximum size of an HTTP message header for protection from buffer overflow attacks. The following code will print the error message:
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Messages may also be read asynchronously. When performing asynchronous stream read operations the stream, buffer, and message variables must remain valid until the operation has completed. Beast asynchronous initiation functions use Asio's completion handler model. This call reads a message asynchronously and reports the error code upon completion. The handler is called with the error, set to any that occurs, and the number of bytes parsed. This number may be used to measure the relative amount of work performed, or it may be ignored as this example shows.
Messages may also be read asynchronously. When performing asynchronous stream read operations the stream, buffer, and message variables must remain valid until the operation has completed. Beast asynchronous initiation functions use Asio's completion handler model. This call reads a message asynchronously and reports the error code upon completion. The handler is called with the error, set to any that occurs, and the number of bytes parsed. This number may be used to measure the relative amount of work performed, or it may be ignored as this example shows.
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Other Implementations of __DynamicBuffer__ may avoid parser
Other Implementations of __DynamicBuffer__ may avoid parser
06/05/2026

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