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Tasks in the Concurrency Runtime operate in a fashion similar to `std::future`, but with some improvements such as continuations which are not yet in the C++ standard. The costs of using a task based asynchronous interface instead of completion handlers is well documented: synchronization points along the call chain of composed task operations which cannot be optimized away. See: [@http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3747.pdf [*A Universal Model for Asynchronous Operations]] (Kohlhoff).
Tasks in the Concurrency Runtime operate in a fashion similar to `std::future`, but with some improvements such as continuations which are not yet in the C++ standard. The costs of using a task based asynchronous interface instead of completion handlers is well documented: synchronization points along the call chain of composed task operations which cannot be optimized away. See: [@http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3747.pdf [*A Universal Model for Asynchronous Operations]] (Kohlhoff).
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The general theme of the HTTP message model in cpprestsdk is "no user definable customizations". There is no allocator support, and no separation of concerns. It is designed to perform a specific set of behaviors. In other words, it does not follow the open/closed principle.
The general theme of the HTTP message model in cpprestsdk is "no user definable customizations". There is no allocator support, and no separation of concerns. It is designed to perform a specific set of behaviors. In other words, it does not follow the open/closed principle.
06/05/2026
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* The HTTP request container conflates HTTP response behavior (see the
* The HTTP request container conflates HTTP response behavior (see the
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* Setting the body requires either a vector or a `concurrency::streams::istream`.
* Setting the body requires either a vector or a `concurrency::streams::istream`.
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* A body can only be extracted once, limiting the use of this container
* A body can only be extracted once, limiting the use of this container
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* No way to define an allocator for the container used when extracting
* No way to define an allocator for the container used when extracting
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* The extraction of the body is conflated with the asynchronous model.
* The extraction of the body is conflated with the asynchronous model.
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* There are no compile-time customization points at all. The only
* There are no compile-time customization points at all. The only
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It is clear from this declaration that the goal of the message model in this library is driven by its use-case (interacting with REST servers) and not to model HTTP messages generally. We note problems similar to the other declarations:
It is clear from this declaration that the goal of the message model in this library is driven by its use-case (interacting with REST servers) and not to model HTTP messages generally. We note problems similar to the other declarations:
06/05/2026
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}; ```
}; ```
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private:
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Finally, here is the public class which represents an HTTP request: ``` class http_request { public:
Finally, here is the public class which represents an HTTP request: ``` class http_request { public:
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* The `_reply_impl` function implies that the message implementation also
* The `_reply_impl` function implies that the message implementation also
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* The "cancellation token" is stored inside the message. This breaks the
* The "cancellation token" is stored inside the message. This breaks the
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* The constructor accepting `std::unique_ptr<http::details::_http_server_context`
* The constructor accepting `std::unique_ptr<http::details::_http_server_context`
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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__:
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__:
06/05/2026
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} // namespace details ```
} // namespace details ```
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};
};
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private:
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