Boost Beast Translation (zh_Hans)/Doc / Qbk / 08 Design / 2 Http Comparison (qbk) — Chinese (Simplified Han script) @ Boost-Weblate: There are a few C++ published libraries which implement some …

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Key	English	Chinese (Simplified Han script)
	HTTP Comparison to Other Libraries	HTTP Comparison to Other Libraries
	There are a few C++ published libraries which implement some of the HTTP protocol. We analyze the message model chosen by those libraries and discuss the advantages and disadvantages relative to Beast.	There are a few C++ published libraries which implement some of the HTTP protocol. We analyze the message model chosen by those libraries and discuss the advantages and disadvantages relative to Beast.
	The general strategy used by the author to evaluate external libraries is as follows:	The general strategy used by the author to evaluate external libraries is as follows:
	* Review the message model. Can it represent a complete request or	* Review the message model. Can it represent a complete request or
	* Review the stream abstraction. This is the type of object, such as	* Review the stream abstraction. This is the type of object, such as
	* Check treatment of buffers. Does the library manage the buffers	* Check treatment of buffers. Does the library manage the buffers
	* How does the library handle corner cases such as trailers,	* How does the library handle corner cases such as trailers,
	Declarations examples from external libraries have been edited:	Declarations examples from external libraries have been edited:
	cpp-netlib	cpp-netlib
	is a network programming library previously intended for Boost but not having gone through formal review. As of this writing it still uses the Boost name, namespace, and directory structure although the project states that Boost acceptance is no longer a goal. The library is based on Boost.Asio and bills itself as ['"a collection of network related routines/implementations geared towards providing a robust cross-platform networking library"]. It cites ['"Common Message Type"] as a feature. As of the branch previous linked, it uses these declarations: ``` template <class Tag> struct basic_message {	is a network programming library previously intended for Boost but not having gone through formal review. As of this writing it still uses the Boost name, namespace, and directory structure although the project states that Boost acceptance is no longer a goal. The library is based on Boost.Asio and bills itself as ['"a collection of network related routines/implementations geared towards providing a robust cross-platform networking library"]. It cites ['"Common Message Type"] as a feature. As of the branch previous linked, it uses these declarations: ``` template <class Tag> struct basic_message {
82	}; ```	}; ```
	This container is the base class template used to represent HTTP messages. It uses a "tag" type style specializations for a variety of trait classes, allowing for customization of the various parts of the message. For example, a user specializes `headers_container<T>` to determine what container type holds the header fields. We note some problems with the container declaration:	This container is the base class template used to represent HTTP messages. It uses a "tag" type style specializations for a variety of trait classes, allowing for customization of the various parts of the message. For example, a user specializes `headers_container<T>` to determine what container type holds the header fields. We note some problems with the container declaration:
	* The header and body containers may only be default-constructed.	* The header and body containers may only be default-constructed.
	* No stateful allocator support.	* No stateful allocator support.
	* There is no way to defer the commitment of the type for `body_` to	* There is no way to defer the commitment of the type for `body_` to
	* The message model includes a "source" and "destination." This is	* The message model includes a "source" and "destination." This is
	* The use of `string_type` (a customization point) for source,	* The use of `string_type` (a customization point) for source,

	English	Chinese (Simplified Han script)	Actions
	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 [@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.
	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:	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:
	} // namespace details ```	} // namespace details ```
	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__:
	* The constructor accepting `std::unique_ptr<http::details::_http_server_context`	* The constructor accepting `std::unique_ptr<http::details::_http_server_context`
	* The "cancellation token" is stored inside the message. This breaks the	* The "cancellation token" is stored inside the message. This breaks the
	* The `_reply_impl` function implies that the message implementation also	* The `_reply_impl` function implies that the message implementation also
	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:
	* No support for allocators, stateful or otherwise.	* No support for allocators, stateful or otherwise.
	HTTP Comparison to Other Libraries	HTTP Comparison to Other Libraries
	There are a few C++ published libraries which implement some of the HTTP protocol. We analyze the message model chosen by those libraries and discuss the advantages and disadvantages relative to Beast.	There are a few C++ published libraries which implement some of the HTTP protocol. We analyze the message model chosen by those libraries and discuss the advantages and disadvantages relative to Beast.
	The general strategy used by the author to evaluate external libraries is as follows:	The general strategy used by the author to evaluate external libraries is as follows:
	* Review the message model. Can it represent a complete request or	* Review the message model. Can it represent a complete request or
	* Review the stream abstraction. This is the type of object, such as	* Review the stream abstraction. This is the type of object, such as
	* Check treatment of buffers. Does the library manage the buffers	* Check treatment of buffers. Does the library manage the buffers
	* How does the library handle corner cases such as trailers,	* How does the library handle corner cases such as trailers,
	Declarations examples from external libraries have been edited:	Declarations examples from external libraries have been edited:
	cpp-netlib	cpp-netlib
	is a network programming library previously intended for Boost but not having gone through formal review. As of this writing it still uses the Boost name, namespace, and directory structure although the project states that Boost acceptance is no longer a goal. The library is based on Boost.Asio and bills itself as ['"a collection of network related routines/implementations geared towards providing a robust cross-platform networking library"]. It cites ['"Common Message Type"] as a feature. As of the branch previous linked, it uses these declarations: ``` template <class Tag> struct basic_message {	is a network programming library previously intended for Boost but not having gone through formal review. As of this writing it still uses the Boost name, namespace, and directory structure although the project states that Boost acceptance is no longer a goal. The library is based on Boost.Asio and bills itself as ['"a collection of network related routines/implementations geared towards providing a robust cross-platform networking library"]. It cites ['"Common Message Type"] as a feature. As of the branch previous linked, it uses these declarations: ``` template <class Tag> struct basic_message {

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