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	English ↹ ↵ NBS … “ ” ‘ ’ ﹙-﹚ ‐ – — }; ``` 6/10000 · 6
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	English ↹ ↵ NBS … “ ” ‘ ’ ﹙-﹚ ‐ – — This declaration is quite bare-bones. We note the typical problems of most field containers: 92/10000 · 92
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	English ↹ ↵ NBS … “ ” ‘ ’ ﹙-﹚ ‐ – — * The container may only be default-constructed. 48/10000 · 48
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	English ↹ ↵ NBS … “ ” ‘ ’ ﹙-﹚ ‐ – — * No support for allocators, stateful or otherwise. 51/10000 · 51
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	English ↹ ↵ NBS … “ ” ‘ ’ ﹙-﹚ ‐ – — * There are no customization points at all. 43/10000 · 43
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	English ↹ ↵ NBS … “ ” ‘ ’ ﹙-﹚ ‐ – — 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 { 517/10000 · 517
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	English ↹ ↵ NBS … “ ” ‘ ’ ﹙-﹚ ‐ – — class http_msg_base { public: 29/10000 · 29
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	English ↹ ↵ NBS … “ ” ‘ ’ ﹙-﹚ ‐ – — }; ``` 6/10000 · 6
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	English ↹ ↵ NBS … “ ” ‘ ’ ﹙-﹚ ‐ – — 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. 654/10000 · 654
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	English ↹ ↵ NBS … “ ” ‘ ’ ﹙-﹚ ‐ – — The next declaration forms the complete implementation class referenced by the handle in the public interface (which follows after): ``` /// Internal representation of an HTTP request message. class _http_request final : public http::details::http_msg_base, public std::enable_shared_from_this<_http_request> { public: 318/10000 · 318
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	English ↹ ↵ NBS … “ ” ‘ ’ ﹙-﹚ ‐ – — } // namespace details ``` 26/10000 · 26
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	English ↹ ↵ NBS … “ ” ‘ ’ ﹙-﹚ ‐ – — As before, we note that the implementation class for HTTP requests concerns itself more with the mechanics of sending the message asynchronously than it does with actually modeling the HTTP message as described in __rfc7230__: 226/10000 · 226
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	English ↹ ↵ NBS … “ ” ‘ ’ ﹙-﹚ ‐ – — * The constructor accepting `std::unique_ptr<http::details::_http_server_context` 81/10000 · 81
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	English ↹ ↵ NBS … “ ” ‘ ’ ﹙-﹚ ‐ – — * The "cancellation token" is stored inside the message. This breaks the 72/10000 · 72
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	English ↹ ↵ NBS … “ ” ‘ ’ ﹙-﹚ ‐ – — * The `_reply_impl` function implies that the message implementation also 73/10000 · 73
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	English ↹ ↵ NBS … “ ” ‘ ’ ﹙-﹚ ‐ – — Finally, here is the public class which represents an HTTP request: ``` class http_request { public: 100/10000 · 100
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