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To understand these declarations we need to first understand that cpprestsdk uses the asynchronous model defined by Microsoft's [@https://msdn.microsoft.com/en-us/library/dd504870.aspx [*Concurrency Runtime]]. Identifiers from the [@https://msdn.microsoft.com/en-us/library/jj987780.aspx [*`pplx` namespace]] define common asynchronous patterns such as tasks and events. The `concurrency::streams::istream` parameter and `m_data_available` data member indicates a lack of separation of concerns. The representation of HTTP messages should not be conflated with the asynchronous model used to serialize or parse those messages in the message declarations.
To understand these declarations we need to first understand that cpprestsdk uses the asynchronous model defined by Microsoft's要理解这些声明，我们首先需要了解 cpprestsdk 使用了微软的 [@https://msdn.microsoft.com/en-us/library/dd504870.aspx [*Concurrency Runtime]]. Identifiers from the 所定义的异步模型。来自 [@https://msdn.microsoft.com/en-us/library/jj987780.aspx [*`pplx` namespace]] define common asynchronous patterns such as tasks and events. The 的标识符定义了诸如任务和事件等通用异步模式。`concurrency::streams::istream` parameter and参数和 `m_data_available` data member indicates a lack of separation of concerns. The representation of HTTP messages should not be conflated with the asynchronous model used to serialize or parse those messages in the message declarations.数据成员表明其关注点分离做得不够好。HTTP 消息的表示形式不应与消息声明中用于序列化或解析这些消息的异步模型混为一谈。
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}; ```
}; ```
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protected:
protected:
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class http_msg_base { public:
class http_msg_base { public:
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Now we analyze the structure of the larger message container. The library uses a handle/body idiom. There are two public message container interfaces, one for requests (`http_request`) and one for responses (`http_response`). Each interface maintains a private shared pointer to an implementation class. Public member function calls are routed to the internal implementation. This is the first implementation class, which forms the base class for both the request and response implementations: ``` namespace details {
Now we analyze the structure of the larger message container. The library uses a handle/body idiom. There are two public message container interfaces, one for requests (`http_request`) and one for responses (`http_response`). Each interface maintains a private shared pointer to an implementation class. Public member function calls are routed to the internal implementation. This is the first implementation class, which forms the base class for both the request and response implementations:现在，我们来分析更大的消息容器的结构。该库使用了句柄/主体惯用法（handle/body idiom）。它提供了两个公开的消息容器接口，一个用于请求（`http_request`），另一个用于响应（`http_response`）。每个接口都维护着一个指向实现类的私有共享指针。公开的成员函数调用会被路由到内部的实现。以下是第一个实现类，它构成了请求和响应实现类的基类： ``` namespace details {
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* There are no customization points at all.
* 完全没有任何自定义点。
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* There are no customization points at all.
* 完全没有自定义点。
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* There are no customization points at all.
* There are no customization points at all.没有自定义点。
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* No support for allocators, stateful or otherwise.
* No support for allocators, stateful or otherwise.不支持分配器，无论是有状态分配器还是其他类型的分配器。
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* The container may only be default-constructed.
* The container may only be default-constructed.该容器只能进行默认构造。
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This declaration is quite bare-bones. We note the typical problems of most field containers:
This declaration is quite bare-bones. We note the typical problems of most field containers:这个声明相当简陋。我们注意到大多数字段容器都存在一些典型问题：
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}; ```
}; ```
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private:
private:
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As cpprestsdk is developed by a large corporation, it contains quite a bit of functionality and necessarily has more interfaces. We will break down the interfaces used to model messages into more manageable pieces. This is the container used to store the HTTP header fields: ``` class http_headers { public:
As由于 cpprestsdk is developed by a large corporation, it contains quite a bit of functionality and necessarily has more interfaces. We will break down the interfaces used to model messages into more manageable pieces. This is the container used to store the HTTP header fields:由大型公司（微软）开发，它包含了相当多的功能，因此也必然拥有更多的接口。我们将把用于建模消息的接口拆解为更易于管理的部分。以下是用于存储 HTTP 头字段的容器： ``` class http_headers { public:
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is a Microsoft project which ['"...aims to help C++ developers connect to and interact with services"]. It offers the most functionality of the libraries reviewed here, including support for Websocket services using its websocket++ dependency. It can use native APIs such as HTTP.SYS when building Windows based applications, and it can use Boost.Asio. The WebSocket module uses Boost.Asio exclusively.
is a Microsoft project which ['"...aims to help C++ developers connect to and interact with services"]. It offers the most functionality of the libraries reviewed here, including support for是一个微软项目，其目标是“帮助 C++ 开发者连接服务并与之交互”。在本文所评测的库中，它的功能最为全面，包括通过其 websocket++ 依赖项来支持 WebsSocket services using its websocket++ dependency. It can use native APIs such as HTTP.SYS when building Windows based applications, and it can use服务。在构建基于 Windows 的应用程序时，它能够使用诸如 HTTP.SYS 等原生 API，同时也支持使用 Boost.Asio. The 。其中，WebSocket module uses Boost.Asio exclusively.模块专门且排他性地使用了 Boost.Asio。
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C++ REST SDK (cpprestsdk)
C++ REST SDK (cpprestsdk)
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This representation addresses a narrow range of use cases. It has limited potential for customization and performance. It is more difficult to use because it excludes the start line fields from the model.
This representation addresses a narrow range of use cases. It has limited potential for customization and performance. It is more difficult to use because it excludes the start line fields from the model.* 这种表示法仅能解决一小部分用例。其自定义潜力和性能表现均十分有限。由于该模型将起始行（start line）字段排除在外，导致其使用难度增加。
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* The [*Body] customization point constrains user defined types to
* The [*Body] customization point constrains user defined types to自定义点将用户自定义类型限制为
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* The declarations imply that `std::vector` is a model of [*Body].
* The declarations imply that这些声明暗示 `std::vector` is a model of是 [*Body]. 的一个模型。
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* The trailers are stored in a separate object. Aside from the combinatorial
* The 尾部（trailers are stored in a separate object. Aside from the combinatorial）存储在一个单独的对象中。除了组合爆炸的问题之外
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