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Function
Function
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WebSocket Stream Write Operations
WebSocket Stream Write Operations
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These stream members are used to write websocket messages:
These stream members are used to write websocket messages:
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Sending
Sending
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Messages can be either text or binary. A message sent as text must contain consist of valid utf8, while a message sent as binary may contain arbitrary data. In addition to message frames, websocket provides ['control frames] in the form of ping, pong, and close messages which have a small upper limit on their payload size. Depending on how a message is framed, control frames may have more opportunities to be sent in-between.
Messages can be either text or binary. A message sent as text must contain consist of valid utf8, while a message sent as binary may contain arbitrary data. In addition to message frames, websocket provides ['control frames] in the form of ping, pong, and close messages which have a small upper limit on their payload size. Depending on how a message is framed, control frames may have more opportunities to be sent in-between.
06/05/2026
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An algorithm should never depend on the way that incoming or outgoing
An algorithm should never depend on the way that incoming or outgoing
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The boundaries between frames of a multi-frame message are not not considered part of the message. Intermediaries such as proxies which forward the websocket traffic are free to "reframe" (split frames and combine them) the message in arbitrary ways. These intermediaries include Beast, which can reframe messages automatically in some cases depending on the options set on the stream.
The boundaries between frames of a multi-frame message are not not considered part of the message. Intermediaries such as proxies which forward the websocket traffic are free to "reframe" (split frames and combine them) the message in arbitrary ways. These intermediaries include Beast, which can reframe messages automatically in some cases depending on the options set on the stream.
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Once a websocket session is established, messages can be sent unsolicited by either peer at any time. A message is made up of one or more ['messages frames]. Each frame is prefixed with the size of the payload in bytes, followed by the data. A frame also contains a flag (called 'fin') indicating whether or not it is the last frame of the message. When a message is made up from only one frame, it is possible to know immediately what the size of the message will be. Otherwise, the total size of the message can only be determined once the last frame is received.
Once a websocket session is established, messages can be sent unsolicited by either peer at any time. A message is made up of one or more ['messages frames]. Each frame is prefixed with the size of the payload in bytes, followed by the data. A frame also contains a flag (called 'fin') indicating whether or not it is the last frame of the message. When a message is made up from only one frame, it is possible to know immediately what the size of the message will be. Otherwise, the total size of the message can only be determined once the last frame is received.
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Messages
Messages
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Component created
Component created (boost_endpoint) 06/05/2026
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Changes committed 06/05/2026
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Parsing of the “doc/qbk/06_websocket/07_teardown.qbk” file was enforced. 06/05/2026
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File “doc/qbk/06_websocket/07_teardown.qbk” was added. 06/05/2026
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To invoke the customization point, first bring the default implementation into scope with a `using` statement. Then call the customization point without namespace qualification, allowing argument-dependent lookup to take effect:
To invoke the customization point, first bring the default implementation into scope with a `using` statement. Then call the customization point without namespace qualification, allowing argument-dependent lookup to take effect:
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Invoking Teardown
Invoking Teardown
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When the implementation invokes the asynchronous teardown function, it always uses an invokable completion handler. It is not necessary to specify the return type customization when creating user-defined overloads of `async_teardown`.
When the implementation invokes the asynchronous teardown function, it always uses an invokable completion handler. It is not necessary to specify the return type customization when creating user-defined overloads of `async_teardown`.
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To provide overloads of teardown for a user-defined type, simply declare the two free functions with the correct signature, accepting a reference to the user-defined type as the stream parameter:
To provide overloads of teardown for a user-defined type, simply declare the two free functions with the correct signature, accepting a reference to the user-defined type as the stream parameter:
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User-defined Teardown
User-defined Teardown
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The implementation provides suitable overloads of the teardown customization points when websocket streams are instantiated using the Asio types __socket__ or __ssl_stream__ for the next layer. In this case no user action is required. However, when the websocket stream is instantiated for a user-defined type, compile errors will result if the customization points are not provided for the user defined type. Furthermore, user-defined types that wrap one of the Asio objects mentioned earlier may wish to invoke a teardown customization point for the wrapped object. This is how those tasks are accomplished.
The implementation provides suitable overloads of the teardown customization points when websocket streams are instantiated using the Asio types __socket__ or __ssl_stream__ for the next layer. In this case no user action is required. However, when the websocket stream is instantiated for a user-defined type, compile errors will result if the customization points are not provided for the user defined type. Furthermore, user-defined types that wrap one of the Asio objects mentioned earlier may wish to invoke a teardown customization point for the wrapped object. This is how those tasks are accomplished.
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* [link beast.ref.boost__beast__websocket__async_teardown `async_teardown`]:
* [link beast.ref.boost__beast__websocket__async_teardown `async_teardown`]:
06/05/2026

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