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 {

* There is no way to defer the commitment of the type for `body_` to

typedef basic_message<boost::http::headers, std::vector<std::uint8_t>> message;

template<class Headers, class Body> struct is_message<basic_message<Headers, Body>>: public std::true_type {}; ```

C++ REST SDK (cpprestsdk)

class http_msg_base { public:

protected:

} // namespace details ```