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A body whose `value_type` is `std::basic_string` or `std::string`. Insertion complexity is amortized constant time, while capacity grows geometrically. Messages with this body type may be serialized and parsed. This is the type of body used in the examples.
[link beast.ref.boost__beast__http__vector_body `vector_body`]
A body whose `value_type` is `std::vector`. Insertion complexity is amortized constant time, while capacity grows geometrically. Messages with this body type may be serialized and parsed.
Usage
These examples show how to create and fill in request and response objects: Here we build an [@https://tools.ietf.org/html/rfc7231#section-4.3.1 HTTP GET] request with an empty message body:
Create Request
193
Statements
193
Serialized Result
[http_snippet_2]
GET /index.htm HTTP/1.1\r\n
Accept: text/html\r\n
User-Agent: Beast\r\n
\r\n
In this code we create an HTTP response with a status code indicating success. This message has a body with a non-zero length. The function [link beast.ref.boost__beast__http__message.prepare_payload `message::prepare_payload`] automatically sets the Content-Length or Transfer-Encoding field depending on the content and type of the `body` member. Use of this function is optional; these fields may also be set explicitly.
Create Response
214
Statements
214
Serialized Result
[http_snippet_3]
HTTP/1.1 200 OK\r\n
Server: Beast\r\n
Content-Length: 13\r\n
\r\n
Hello, world!
The implementation will automatically fill in the obsolete [@https://tools.ietf.org/html/rfc7230#section-3.1.2 reason-phrase] from the status code when serializing a message. Or it may be set directly using [link beast.ref.boost__beast__http__header.reason.overload2 `header::reason`].
English Actions
Message Containers
Beast provides a single class template __message__ and some aliases which model HTTP/1 and [@https://tools.ietf.org/html/rfc7540 HTTP/2] messages:
Message
__message__
/// An HTTP message
template<
bool isRequest, // `true` for requests, `false` for responses
class Body, // Controls the container and algorithms used for the body
class Fields = fields> // The type of container to store the fields
class message;
[link beast.ref.boost__beast__http__request `request`]
/// A typical HTTP request
template<class Body, class Fields = fields>
using request = message<true, Body, Fields>;
[link beast.ref.boost__beast__http__response `response`]
/// A typical HTTP response
template<class Body, class Fields = fields>
using response = message<false, Body, Fields>;
The container offers value semantics including move and copy if supported by __Body__ and __Fields__. User defined template function parameters can accept any message, or can use partial specialization to accept just requests or responses. The default __fields__ is a provided associative container using the standard allocator and supporting modification and inspection of fields. As per __rfc7230__, a non-case-sensitive comparison is used for field names. User defined types for fields are possible. The `Body` type determines the type of the container used to represent the body as well as the algorithms for transferring buffers to and from the container. The library comes with a collection of common body types. As with fields, user defined body types are possible.
Sometimes it is desired to only work with a header. Beast provides a single class template __header__ and some aliases to model HTTP/1 and HTTP/2 headers:
Header
__header__
/// An HTTP header
template<
bool isRequest, // `true` for requests, `false` for responses
class Fields = fields> // The type of container to store the fields
class header;
[link beast.ref.boost__beast__http__request_header `request_header`]
/// A typical HTTP request header
template<class Fields>
using request_header = header<true, Fields>;
Create Request
[http_snippet_2]
GET /index.htm HTTP/1.1\r\n
Accept: text/html\r\n
User-Agent: Beast\r\n
\r\n
In this code we create an HTTP response with a status code indicating success. This message has a body with a non-zero length. The function [link beast.ref.boost__beast__http__message.prepare_payload `message::prepare_payload`] automatically sets the Content-Length or Transfer-Encoding field depending on the content and type of the `body` member. Use of this function is optional; these fields may also be set explicitly.
Create Response
[http_snippet_3]
HTTP/1.1 200 OK\r\n
Server: Beast\r\n
Content-Length: 13\r\n
\r\n
Hello, world!
The implementation will automatically fill in the obsolete [@https://tools.ietf.org/html/rfc7230#section-3.1.2 reason-phrase] from the status code when serializing a message. Or it may be set directly using [link beast.ref.boost__beast__http__header.reason.overload2 `header::reason`].

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HTTP/1.1 200 OK\r\n
Server: Beast\r\n
Content-Length: 13\r\n
\r\n
Hello, world!
HTTP/1.1 200 OK\r\n
Server: Beast\r\n
Content-Length: 13\r\n
\r\n
Hello, world!
06/05/2026
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Glossary

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String information

Component
Boost Beast Translation (zh_Hans)/Doc / Qbk / 04 Http / 02 Message (qbk)
Source string description
type: table code
Flags
read-only
Unit identifier
57333
Source string location
string ID 214
String age
06/05/2026
Last updated
06/05/2026
Source string age
06/05/2026
Translation file QuickBook file
doc/qbk/04_http/02_message.qbk, string 52