Exit Zen
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string ID 37
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During the development of Beast the authors have studied other software packages and in particular the comments left during the Boost Review process of other packages offering similar functionality. In this section and the FAQs that follow we attempt to answer those questions that are also applicable to Beast.
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string ID 22
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This is the type of the object passed to the decorator to represent HTTP Upgrade response.
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string ID 21
type: table cell
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This functions returns a new buffer sequence which, when iterated, traverses the sequence which would be formed if all of the input buffer sequences were concatenated. With this routine, multiple calls to a stream's `write_some` function may be combined into one, eliminating expensive system calls.
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The [link beast.ref.boost__beast__websocket__stream `websocket::stream`] member functions [link beast.ref.boost__beast__websocket__stream.handshake `handshake`] and [link beast.ref.boost__beast__websocket__stream.async_handshake `async_handshake`] are used to send the request with the required host and target strings. This code connects to the IP address returned from a hostname lookup, then performs the WebSocket handshake in the client role.
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string ID 36
type: table title
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Valid expressions
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string ID 17
type: table cell
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This implementation of __File__ uses the C++ standard library facilities obtained by including `<cstdio>`.
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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`.
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string ID 38
type: table cell
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Determines the type of the [link beast.ref.boost__beast__http__message.body `message::body`] member.
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In this table:
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string ID 16
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"This should work with standalone-Asio!"
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string ID 37
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In this table:
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string ID 22
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This function returns the suggested timeout settings for a given role (client or server).
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The creation and operation of the __io_context__ associated with the underlying stream is left to the callers, permitting any implementation strategy including one that does not require threads for environments where threads are unavailable. Beast WebSocket itself does not use or require threads.
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string ID 54
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[link beast.ref.boost__beast__basic_stream `basic_stream`]
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Unlike regular completion handlers used in calls to asynchronous initiation functions, the control callback only needs to be set once. The callback is not reset after being called. The same callback is used for both synchronous and asynchronous reads. The callback is passive; in order to be called, a stream read operation must be active.
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The Expect field with the value "100-continue" in a request is special. It indicates that the after sending the message header, a client desires an immediate informational response before sending the message body, which presumably may be expensive to compute or large. This behavior is described in [@https://tools.ietf.org/html/rfc7231#section-5.1.1 rfc7231 section 5.1.1]. Handling the Expect field can be implemented easily in a server by constructing a __parser__ to read the header first, then send an informational HTTP response, and finally read the body using the same parser instance. A synchronous version of this server action looks like this:
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This class is designed to be used as a base class when authoring composed asynchronous operations expressed as an intermediate completion handler. This eliminates the need for the extensive boilerplate to propagate the associated executor and the associated allocator.
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This library is not a client or server, but it can be used to build those things. Many examples are provided, including clients and servers, which may be used as a starting point for writing your own program.
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* Calling a synchronous function by accident. In general composed
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string ID 19
type: table cell
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Enables the use of deprecated APIs within Beast.
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