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This example illustrates how a server may make the commitment of a body type depending on the method verb:
This example illustrates how a server may make the commitment of a body type depending on the method verb:本示例演示服务器如何根据请求方法来决定使用哪种消息体类型：
06/18/2026
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Sophisticated servers may wish to defer the choice of the Body template type until after the header is available. Then, a body type may be chosen depending on the header contents. For example, depending on the verb, target path, or target query parameters. To accomplish this, a parser is declared to read in the header only, using a trivial body type such as [link beast.ref.boost__beast__http__empty_body `empty_body`]. Then, a new parser is constructed from this existing parser where the body type is conditionally determined by information from the header or elsewhere.
Sophisticated servers may wish to defer the choice of the Body template type until after the header is available. Then, a body type may be chosen depending on the header contents. For example, depending on the verb, target path, or target query parameters. To accomplish this, a parser is declared to read in the header only, using a trivial body type such as [link beast.ref.boost__beast__http__empty_body `empty_body`]. Then, a new parser is constructed from this existing parser where the body type is conditionally determined by information from the header or elsewhere.高级服务器可能希望等到获取头部信息后，再决定使用哪种 Body 模板类型。这样就能根据头部内容（例如请求方法、目标路径或查询参数）来选用合适的消息体类型。具体做法是：先使用一个简单的消息体类型（如 [link beast.ref.boost__beast__http__empty_body `empty_body`]）声明解析器，只用于读取头部。然后，基于这个已有的解析器构造一个新的解析器，并根据头部或其他信息来确定新解析器的消息体类型。
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Change Body Type __example__
Change Body Type __example修改消息体类型 __示例__
06/18/2026
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These examples in this section are working functions that may be found in the examples directory. They demonstrate the usage of the library for a variety of scenarios.
These examples in this section are working functions that may be found in the examples directory. They demonstrate the usage of the library for a variety of scenarios.本节提供的示例均为可运行函数，存放于 examples 目录中。这些示例展示了该库在不同场景下的具体用法。
06/18/2026
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HTTP Examples
HTTP Examples示例
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This example reads from a child process and sends the output back in an HTTP response. The output of the process is sent as it becomes available:
This example reads from a child process and sends the output back in an HTTP response. The output of the process is sent as it becomes available:
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To enable these use-cases, the body type __buffer_body__ is provided. This body uses a caller-provided pointer and size instead of an owned container. To use this body, instantiate an instance of the serializer and fill in the pointer and size fields before calling a stream write function.
To enable these use-cases, the body type __buffer_body__ is provided. This body uses a caller-provided pointer and size instead of an owned container. To use this body, instantiate an instance of the serializer and fill in the pointer and size fields before calling a stream write function.
06/05/2026
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Sometimes it is necessary to send a message whose body is not conveniently described by a single container. For example, when implementing an HTTP relay function a robust implementation needs to present body buffers individually as they become available from the downstream host. These buffers should be fixed in size, otherwise creating the unnecessary and inefficient burden of reading the complete message body before forwarding it to the upstream host.
Sometimes it is necessary to send a message whose body is not conveniently described by a single container. For example, when implementing an HTTP relay function a robust implementation needs to present body buffers individually as they become available from the downstream host. These buffers should be fixed in size, otherwise creating the unnecessary and inefficient burden of reading the complete message body before forwarding it to the upstream host.
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Send Child Process Output __example__
Send Child Process Output __example__
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The example that follows implements a synchronous HTTP relay. It uses a fixed size buffer, to avoid reading in the entire body so that the upstream connection sees a header without unnecessary latency. This example brings together all of the concepts discussed so far, it uses both a __serializer__ and a __parser__ to achieve its goal:
The example that follows implements a synchronous HTTP relay. It uses a fixed size buffer, to avoid reading in the entire body so that the upstream connection sees a header without unnecessary latency. This example brings together all of the concepts discussed so far, it uses both a __serializer__ and a __parser__ to achieve its goal:
06/05/2026
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An HTTP proxy acts as a relay between client and server. The proxy reads a request from the client and sends it to the server, possibly adjusting some of the headers and representation of the body along the way. Then, the proxy reads a response from the server and sends it back to the client, also with the possibility of changing the headers and body representation.
An HTTP proxy acts as a relay between client and server. The proxy reads a request from the client and sends it to the server, possibly adjusting some of the headers and representation of the body along the way. Then, the proxy reads a response from the server and sends it back to the client, also with the possibility of changing the headers and body representation.
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HTTP Relay __example__
HTTP Relay __example__
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When a server receives a [@https://tools.ietf.org/html/rfc7231#section-4.3.2 HEAD request], the response should contain the entire header that would be delivered if the method was GET, except that the body is omitted.
When a server receives a [@https://tools.ietf.org/html/rfc7231#section-4.3.2 HEAD request], the response should contain the entire header that would be delivered if the method was GET, except that the body is omitted.
06/05/2026
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HEAD response (Server) __example__
HEAD response (Server) __example__
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The [@https://tools.ietf.org/html/rfc7231#section-4.3.2 HEAD request] method indicates to the server that the client wishes to receive the entire header that would be delivered if the method was GET, except that the body is omitted. When a client wishes to receive the response to a HEAD request, it is necessary to inform the parser not to expect a body. This is done by calling [link beast.ref.boost__beast__http__basic_parser.skip `basic_parser::skip`] with the value `true`, as shown in this example:
The [@https://tools.ietf.org/html/rfc7231#section-4.3.2 HEAD request] method indicates to the server that the client wishes to receive the entire header that would be delivered if the method was GET, except that the body is omitted. When a client wishes to receive the response to a HEAD request, it is necessary to inform the parser not to expect a body. This is done by calling [link beast.ref.boost__beast__http__basic_parser.skip `basic_parser::skip`] with the value `true`, as shown in this example:
06/05/2026

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