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A secure SSL/TLS connection requires a proper shutdown process to securely indicate the [@https://en.wikipedia.org/wiki/End-of-file ['EOF]] condition. This process prevents a type of attack known as a [@https://en.wikipedia.org/wiki/Transport_Layer_Security#Truncation_attack ['truncation attack]] in which an attacker can close the underlying transport layer and control the length of the last message in the SSL/TLS connection. A shutdown process consists of exchanging `close_notify` message between two parties. In __Asio__ these steps happen by calling `shutdown()` or `async_shutdown()` on `ssl::stream` object.
A secure安全的 SSL/TLS connection requires a proper shutdown process to securely indicate the [@https://en.wikipedia.org/wiki/End-of-file ['EOF]] condition. This process prevents a type of attack known as a [@https://en.wikipedia.org/wiki/Transport_Layer_Security#Truncation_attack ['truncation attack]] in which an attacker can close the underlying transport layer and control the length of the last message in the SSL/TLS connection. A shutdown process consists of exchanging `close_notify` message between two parties. In __Asio__ these steps happen by calling连接需要通过正确的关闭流程来安全地指示 [文件结束] 条件。该流程用于防止被称为 [截断攻击] 的安全威胁，攻击者可以通过关闭底层传输层来控制 SSL/TLS 连接中最后一条消息的长度。关闭流程包含双方交换 `close_notify` 消息。在 __Asio__ 中，这些步骤通过调用 `ssl::stream` 对象的 `shutdown()` or或 `async_shutdown()` on `ssl::stream` object.函数完成。
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SSL/TLS Shutdown
SSL/TLS Shutdown关闭流程
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A variable of type [link beast.ref.boost__beast__websocket__stream `websocket::stream<tcp::socket>`] which is already connected with a remote host.
A variable of type一个类型为 [link beast.ref.boost__beast__websocket__stream `websocket::stream<tcp::socket>`] which is already connected with a remote host.的变量，该变量已与远程主机建立连接。
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[link beast.ref.boost__beast__websocket__stream [*`ws`]]
[link beast.ref.boost__beast__websocket__stream [*`ws`]]
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A variable of type [@boost:/doc/html/boost_asio/reference/ssl__stream.html `net::ssl::stream<tcp::socket>`] which is already connected and has handshaked with a remote host.
A variable of type一个类型为 [@boost:/doc/html/boost_asio/reference/ssl__stream.html `net::ssl::stream<tcp::socket>`] which is already connected and has handshaked with a remote host.的变量，该变量已与远程主机建立连接并完成握手。
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[@boost:/doc/html/boost_asio/reference/ssl__stream.html [*`ssl_sock`]]
[@boost:/doc/html/boost_asio/reference/ssl__stream.html [*`ssl_sock`]]
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A variable of type [@boost:/doc/html/boost_asio/reference/ip__tcp/socket.html `tcp::socket`] which has already been connected to a remote host.
A variable of type一个类型为 [@boost:/doc/html/boost_asio/reference/ip__tcp/socket.html `tcp::socket`] which has already been connected to a remote host.的变量，该变量已连接到远程主机。
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[@boost:/doc/html/boost_asio/reference/ip__tcp/socket.html [*`sock`]]
[@boost:/doc/html/boost_asio/reference/ip__tcp/socket.html [*`sock`]]
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A variable of type __io_context__ which is running on one separate thread, and upon which an __executor_work_guard__ object has been constructed.
A variable of type __io_context__ which is running on one separate thread, and upon which an __executor_work_guard__ object has been constructed.一个类型为 __io_context__ 的变量，该变量在单独线程上运行，且已为其构造一个 __executor_work_guard__ 对象。
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[@boost:/doc/html/boost_asio/reference/io_context.html [*`ioc`]]
[@boost:/doc/html/boost_asio/reference/io_context.html [*`ioc`]]
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Description
Description描述
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Name
Name名称
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Global Variables
Global Variables全局变量
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Throughout this documentation identifiers with the following names have special meaning:
Throughout this documentation identifiers with the following names have special meaning:在本文档中，以下名称的标识符具有特殊含义：
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Most library stream algorithms require a __socket__, __ssl_stream__, or other __Stream__ object that has already established communication with a remote peer. This example is provided as a reminder of how to work with sockets:
Most library stream algorithms require a大多数库中的流算法都需要一个已与远程对等端建立通信的 __socket__, 、__ssl_stream__, or other 或其他 __Stream__ object that has already established communication with a remote peer. This example is provided as a reminder of how to work with sockets:对象。以下示例用于回顾如何使用套接字：
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Using Networking
Using Networking使用网络库
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This transformed, internal handler is responsible for the finalizing step that delivers the result of the operation to the caller. For example, when using `net::use_future` the internal handler will deliver the result by calling [@https://en.cppreference.com/w/cpp/thread/promise/set_value `std::promise::set_value`] on the promise object returned by the initiating function.
This transformed, internal handler is responsible for the finalizing step that delivers the result of the operation to the caller. For example, when using `net::use_future` the internal handler will deliver the result by calling这个经过转换的内部处理器负责执行最终步骤，将操作结果传递给调用方。例如，当使用 `net::use_future` 时，内部处理器会通过调用发起函数返回的 promise 对象上的 [@https://en.cppreference.com/w/cpp/thread/promise/set_value `std::promise::set_value`] on the promise object returned by the initiating function.来传递结果。
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The type of the function's return value is determined by the [@boost:/doc/html/boost_asio/reference/async_result.html `net::async_result`] customization point, which comes with specializations for common library types such as `std::future` and may also be specialized for user-defined types. The body of the initiating function calls the [@boost:/doc/html/boost_asio/reference/async_initiate.html `net::async_initiate`] helper to capture the arguments and forward them to the specialization of `async_result`. An additional "initiation function" object is provided which `async_result` may use to immediately launch the operation, or defer the launch of the operation until some point in the future (this is called "lazy execution"). The initiation function object receives the internal completion handler which matches the signature expected by the initiating function:
The type of the function's return value is determined by the函数返回值类型由 [@boost:/doc/html/boost_asio/reference/async_result.html `net::async_result`] customization point, which comes with specializations for common library types such as `std::future` and may also be specialized for user-defined types. The body of the initiating function calls the [@boost:/doc/html/boost_asio/reference/async_initiate.html `net::async_initiate`] helper to capture the arguments and forward them to the specialization of `async_result`. An additional "initiation function" object is provided which `async_result` may use to immediately launch the operation, or defer the launch of the operation until some point in the future (this is called "lazy execution"). The initiation function object receives the internal completion handler which matches the signature expected by the initiating function:定制点决定。该定制点为 `std::future` 等常用库类型提供特化版本，同时也支持用户自定义类型的特化。发起函数的函数体通过调用 [@boost:/doc/html/boost_asio/reference/async_initiate.html `net::async_initiate`] 辅助函数来捕获参数并将其转发给 `async_result` 的特化版本。此外，还提供一个额外的“发起函数”对象，`async_result` 可利用该对象立即启动操作，或将操作启动延迟到未来某个时刻（即“延迟执行”）。该发起函数对象接收一个内部完成处理器，其签名与发起函数所期望的签名相匹配。
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