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[link beast.ref.boost__beast__http__parser.on_chunk_body `on_chunk_body`]
[link beast.ref.boost__beast__http__parser.on_chunk_body `on_chunk_body`]
06/18/2026
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Set a callback to be invoked on each chunk header.

The callback will be invoked once for every chunk in the message payload, as well as once for the last chunk. The invocation happens after the chunk header is available but before any body octets have been parsed.

The extensions are provided in raw, validated form, use [link beast.ref.boost__beast__http__basic_chunk_extensions.parse `chunk_extensions::parse`] to parse the extensions into a structured container for easier access. The implementation type-erases the callback without requiring a dynamic allocation. For this reason, the callback object is passed by a non-constant reference.

The function object will be called with this equivalent signature:
Set a callback to be invoked on each chunk header.

The callback will be invoked once for every chunk in the message payload, as well as once for the last chunk. The invocation happens after the chunk header is available but before any body octets have been parsed.

The extensions are provided in raw, validated form, use [link beast.ref.boost__beast__http__basic_chunk_extensions.parse `chunk_extensions::parse`] to parse the extensions into a structured container for easier access. The implementation type-erases the callback without requiring a dynamic allocation. For this reason, the callback object is passed by a non-constant reference.

The function object will be called with this equivalent signature:设置一个回调函数，在每次解析分块头部时调用。

该回调函数会对消息体中的每个分块调用一次，同时对最后一个分块也调用一次。调用时机在分块头部可用之后、分块体数据开始解析之前。

分块扩展以原始格式提供，且已经过验证。可以使用 [link beast.ref.boost__beast__http__basic_chunk_extensions.parse `chunk_extensions::parse`] 将扩展解析为结构化容器，便于访问。该实现通过类型擦除处理回调，且无需动态分配内存，因此回调对象通过非常量引用传递。

回调函数对象的调用签名等效于：
06/18/2026
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[link beast.ref.boost__beast__http__parser.on_chunk_header `on_chunk_header`]
[link beast.ref.boost__beast__http__parser.on_chunk_header `on_chunk_header`]
06/16/2026
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Description
Description描述
158
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Name
Name名称
158
06/16/2026
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Chunking Parse Callbacks
Chunking Parse Callbacks分块解析回调接口
06/16/2026
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The __parser__ automatically removes the chunked transfer coding when it is the last encoding in the list. However, it also discards the chunk extensions and does not provide a way to determine the boundaries between chunks. Advanced applications which need to access the chunk extensions or read complete individual chunks may use a callback interface provided by __parser__:
The __parser__ automatically removes the chunked transfer coding when it is the last encoding in the list. However, it also discards the chunk extensions and does not provide a way to determine the boundaries between chunks. Advanced applications which need to access the chunk extensions or read complete individual chunks may use a callback interface provided by当分块传输编码位于编码列表的末尾时，__parser__ 会自动将其移除。但在此过程中，解析器会丢弃分块扩展，也不提供确定分块之间边界的方法。对于需要访问分块扩展或读取完整分块的高级应用，可以使用 __parser__: 提供的回调接口：
06/16/2026
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Parsing Chunks
解析分块数据
06/16/2026
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Parsing Chunks
Parsing Chunks解析分块数据
06/16/2026
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For the ultimate level of control, a caller can manually compose the chunk itself by first emitting a header with the correct chunk body size, and then by emitting the chunk body in multiple calls to the stream write function. In this case the caller is responsible for also emitting the terminating CRLF (`"\r\n"`):
For the ultimate level of control, a caller can manually compose the chunk itself by first emitting a header with the correct chunk body size, and then by emitting the chunk body in multiple calls to the stream write function. In this case the caller is responsible for also emitting the terminating若需要最高级别的控制，调用方可以手动组合分块：先发送一个带有正确分块体大小的头部，然后通过多次调用流写入函数来发送分块体。此时，调用方还需负责发送终止的 CRLF (（`"\r\n"`):）：
06/16/2026
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Alternatively, callers can take over the generation and lifetime management of the serialized trailer fields by passing in a non-owning string:
Alternatively, callers can take over the generation and lifetime management of the serialized trailer fields by passing in a non-owning string:或者，调用方也可以传入一个非拥有字符串，自行负责序列化尾部字段的生成及其生命周期管理：
06/16/2026
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Using a custom allocator to serialize the last chunk:
Using a custom allocator to serialize the last chunk:使用自定义分配器序列化最后分块：
06/16/2026
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The next code sample emits a chunked response which promises two trailer fields and delivers them in the last chunk. The implementation allocates memory using the default or a passed-in allocator to hold the state information required to serialize the trailer:
The next code sample emits a chunked response which promises two trailer fields and delivers them in the last chunk. The implementation allocates memory using the default or a passed-in allocator to hold the state information required to serialize the trailer:以下代码示例发送一个分块响应，该响应承诺携带两个尾部字段，并在最后分块中发送这些字段。实现会使用默认分配器或传入的分配器分配内存，用于保存序列化尾部所需的状态信息：
06/16/2026
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Callers can take over the generation and management of the extensions buffer by passing a non-owning string. Note that this requires the string contents to adhere to the correct syntax for chunk extensions, including the needed double quotes for values which contain spaces:
Callers can take over the generation and management of the extensions buffer by passing a non-owning string. Note that this requires the string contents to adhere to the correct syntax for chunk extensions, including the needed double quotes for values which contain spaces:调用方可以通过传递一个非拥有字符串来接管扩展缓冲区的生成和管理。需要注意的是，这要求字符串内容符合分块扩展的正确语法，包括对包含空格的字段值使用必要的双引号：
06/16/2026
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The following code sends additional chunks, and sets chunk extensions using the helper container. The container automatically quotes values in the serialized output when necessary:
The following code sends additional chunks, and sets chunk extensions using the helper container. The container automatically quotes values in the serialized output when necessary:以下代码发送额外的分块，并使用辅助容器设置分块扩展。该容器在必要时会自动对序列化输出中的值进行引号处理：
06/16/2026
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This example demonstrates sending a complete chunked message payload manually. No chunk extensions or trailers are emitted:
This example demonstrates sending a complete chunked message payload manually. No chunk extensions or trailers are emitted:本示例演示如何手动发送完整的分块消息有效载荷，过程中不发送分块扩展或尾部字段：
06/16/2026

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