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type: paragraph
With multi-layered streams such as the one declared above, accessing an individual layer can be cumbersome when using chained calls to `next_layer`. The function [link beast.ref.boost__beast__get_lowest_layer `get_lowest_layer`] returns the last stream in a stack of layers in a layered stream. Here we access the lowest layer to cancel all outstanding I/O.
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Name
Name
Description
Description
`NextLayer`
`NextLayer`
The type of the next layer. An object of this type will be constructed and maintained for the lifetime of the stream. All reads and writes will go through the next layer. This type must meet the requirements of either __SyncStream__, __AsyncStream__, or both, depending on the style of I/O that is to be performed.
The type of the next layer. An object of this type will be constructed and maintained for the lifetime of the stream. All reads and writes will go through the next layer. This type must meet the requirements of either __SyncStream__, __AsyncStream__, or both, depending on the style of I/O that is to be performed.
`deflateSupported`
`deflateSupported`
When this value is `true`, the stream will support (but not require) the [@https://tools.ietf.org/html/rfc7692 permessage-deflate extension]. Whether or not the stream actually requests or accepts the extension during a handshake depends on a separate configurable option.

When the value is `false` the extension is disabled. Streams will never request the extension in the client role or accept a request for the extension in the server role. An additional benefit of disabling the extension is that compilation will be faster, and the resulting program executable will contain less code.
When this value is `true`, the stream will support (but not require) the [@https://tools.ietf.org/html/rfc7692 permessage-deflate extension]. Whether or not the stream actually requests or accepts the extension during a handshake depends on a separate configurable option.

When the value is `false` the extension is disabled. Streams will never request the extension in the client role or accept a request for the extension in the server role. An additional benefit of disabling the extension is that compilation will be faster, and the resulting program executable will contain less code.
When a stream is constructed, any arguments provided to the constructor are forwarded to the next layer object's constructor. This declares a stream over a plain TCP/IP socket using an I/O context:
When a stream is constructed, any arguments provided to the constructor are forwarded to the next layer object's constructor. This declares a stream over a plain TCP/IP socket using an I/O context:
Websocket streams use their own protocol-specific timeout feature. When
Websocket streams use their own protocol-specific timeout feature. When
As with most I/O objects, a websocket stream is [*not thread-safe]. Undefined behavior results if two different threads access the object concurrently. For multi-threaded programs, the `tcp_stream` can be constructed from an executor, in this case a strand. The stream declared below will use a strand to invoke all completion handlers:
As with most I/O objects, a websocket stream is [*not thread-safe]. Undefined behavior results if two different threads access the object concurrently. For multi-threaded programs, the `tcp_stream` can be constructed from an executor, in this case a strand. The stream declared below will use a strand to invoke all completion handlers:
If the next layer supports move-construction, then the websocket stream can be constructed from a moved-from object.
If the next layer supports move-construction, then the websocket stream can be constructed from a moved-from object.
The next layer may be accessed by calling [link beast.ref.boost__beast__websocket__stream.next_layer.overload1 `stream::next_layer`].
The next layer may be accessed by calling [link beast.ref.boost__beast__websocket__stream.next_layer.overload1 `stream::next_layer`].
Using SSL
Using SSL
To use WebSockets over SSL, use an instance of the __ssl_stream__ class template as the template type for the stream. The required __io_context__ and __ssl_context__ arguments are forwarded to the wrapped stream's constructor:
To use WebSockets over SSL, use an instance of the __ssl_stream__ class template as the template type for the stream. The required __io_context__ and __ssl_context__ arguments are forwarded to the wrapped stream's constructor:
Code which declares websocket stream objects using Asio SSL types
Code which declares websocket stream objects using Asio SSL types
As before, the underlying SSL stream may be accessed by calling `next_layer`.
As before, the underlying SSL stream may be accessed by calling `next_layer`.
With multi-layered streams such as the one declared above, accessing an individual layer can be cumbersome when using chained calls to `next_layer`. The function [link beast.ref.boost__beast__get_lowest_layer `get_lowest_layer`] returns the last stream in a stack of layers in a layered stream. Here we access the lowest layer to cancel all outstanding I/O.
With multi-layered streams such as the one declared above, accessing an individual layer can be cumbersome when using chained calls to `next_layer`. The function [link beast.ref.boost__beast__get_lowest_layer `get_lowest_layer`] returns the last stream in a stack of layers in a layered stream. Here we access the lowest layer to cancel all outstanding I/O.
Non-Blocking Mode
Non-Blocking Mode
Please note that websocket streams do not support non-blocking modes.
Please note that websocket streams do not support non-blocking modes.
English Chinese (Simplified Han script) Actions
Name
Name
Description
Description
`NextLayer`
`NextLayer`
The type of the next layer. An object of this type will be constructed and maintained for the lifetime of the stream. All reads and writes will go through the next layer. This type must meet the requirements of either __SyncStream__, __AsyncStream__, or both, depending on the style of I/O that is to be performed.
The type of the next layer. An object of this type will be constructed and maintained for the lifetime of the stream. All reads and writes will go through the next layer. This type must meet the requirements of either __SyncStream__, __AsyncStream__, or both, depending on the style of I/O that is to be performed.
`deflateSupported`
`deflateSupported`
When this value is `true`, the stream will support (but not require) the [@https://tools.ietf.org/html/rfc7692 permessage-deflate extension]. Whether or not the stream actually requests or accepts the extension during a handshake depends on a separate configurable option.

When the value is `false` the extension is disabled. Streams will never request the extension in the client role or accept a request for the extension in the server role. An additional benefit of disabling the extension is that compilation will be faster, and the resulting program executable will contain less code.
When this value is `true`, the stream will support (but not require) the [@https://tools.ietf.org/html/rfc7692 permessage-deflate extension]. Whether or not the stream actually requests or accepts the extension during a handshake depends on a separate configurable option.

When the value is `false` the extension is disabled. Streams will never request the extension in the client role or accept a request for the extension in the server role. An additional benefit of disabling the extension is that compilation will be faster, and the resulting program executable will contain less code.
When a stream is constructed, any arguments provided to the constructor are forwarded to the next layer object's constructor. This declares a stream over a plain TCP/IP socket using an I/O context:
When a stream is constructed, any arguments provided to the constructor are forwarded to the next layer object's constructor. This declares a stream over a plain TCP/IP socket using an I/O context:
Websocket streams use their own protocol-specific timeout feature. When
Websocket streams use their own protocol-specific timeout feature. When
As with most I/O objects, a websocket stream is [*not thread-safe]. Undefined behavior results if two different threads access the object concurrently. For multi-threaded programs, the `tcp_stream` can be constructed from an executor, in this case a strand. The stream declared below will use a strand to invoke all completion handlers:
As with most I/O objects, a websocket stream is [*not thread-safe]. Undefined behavior results if two different threads access the object concurrently. For multi-threaded programs, the `tcp_stream` can be constructed from an executor, in this case a strand. The stream declared below will use a strand to invoke all completion handlers:
If the next layer supports move-construction, then the websocket stream can be constructed from a moved-from object.
If the next layer supports move-construction, then the websocket stream can be constructed from a moved-from object.
The next layer may be accessed by calling [link beast.ref.boost__beast__websocket__stream.next_layer.overload1 `stream::next_layer`].
The next layer may be accessed by calling [link beast.ref.boost__beast__websocket__stream.next_layer.overload1 `stream::next_layer`].
Using SSL
Using SSL
To use WebSockets over SSL, use an instance of the __ssl_stream__ class template as the template type for the stream. The required __io_context__ and __ssl_context__ arguments are forwarded to the wrapped stream's constructor:
To use WebSockets over SSL, use an instance of the __ssl_stream__ class template as the template type for the stream. The required __io_context__ and __ssl_context__ arguments are forwarded to the wrapped stream's constructor:
Code which declares websocket stream objects using Asio SSL types
Code which declares websocket stream objects using Asio SSL types
As before, the underlying SSL stream may be accessed by calling `next_layer`.
As before, the underlying SSL stream may be accessed by calling `next_layer`.
With multi-layered streams such as the one declared above, accessing an individual layer can be cumbersome when using chained calls to `next_layer`. The function [link beast.ref.boost__beast__get_lowest_layer `get_lowest_layer`] returns the last stream in a stack of layers in a layered stream. Here we access the lowest layer to cancel all outstanding I/O.
With multi-layered streams such as the one declared above, accessing an individual layer can be cumbersome when using chained calls to `next_layer`. The function [link beast.ref.boost__beast__get_lowest_layer `get_lowest_layer`] returns the last stream in a stack of layers in a layered stream. Here we access the lowest layer to cancel all outstanding I/O.
Non-Blocking Mode
Non-Blocking Mode
Please note that websocket streams do not support non-blocking modes.
Please note that websocket streams do not support non-blocking modes.

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With multi-layered streams such as the one declared above, accessing an individual layer can be cumbersome when using chained calls to `next_layer`. The function [link beast.ref.boost__beast__get_lowest_layer `get_lowest_layer`] returns the last stream in a stack of layers in a layered stream. Here we access the lowest layer to cancel all outstanding I/O.
With multi-layered streams such as the one declared above, accessing an individual layer can be cumbersome when using chained calls to `next_layer`. The function [link beast.ref.boost__beast__get_lowest_layer `get_lowest_layer`] returns the last stream in a stack of layers in a layered stream. Here we access the lowest layer to cancel all outstanding I/O.
06/05/2026
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Source string description
type: paragraph
Unit identifier
59378
Source string location
string ID 131
String age
06/05/2026
Last updated
06/05/2026
Source string age
06/05/2026
Translation file QuickBook file
doc/qbk/06_websocket/_websocket_zh_Hans.qbk, string 23