v.0.7.0

[eao197]

This is the first significant release since v.0.6.13 and there are several breaking changes.

• Switch to C++17. Since v.0.7.0 RESTinio requires C++17 as the minimal C++ standard.
• Switch to nodejs/llhttp library for parsing HTTP requests. Previous versions of RESTinio used nodejs/http-parser, but it is now deprecated and no longer maintained. Since v.0.7.0 RESTinio uses nodejs/llhttp.
• No more external projects for optional, variant and string_view. After switching to C++17 RESTinio uses std::optional, std::variant and std::string_view. Note that for the expected class RESTinio still needs the expected-lite project as a dependency.
• Switch to Catch2 v3. The Catch2 library is used in RESTinio for testing. The first versions of Catch2 were header-only, but since v3 the Catch2 needs to be compiled as a library. Since v.0.7.0 RESTinio uses Catch2 v3 and can’t be used with previous versions of Catch2 library.
• The Clara library is no longer used in RESTinio samples/tests/benchmarks. Parsing of command line arguments in some samples/tests/benchmarks becomes more simple and arguments with long names can’t be shortened now. It means that if --address is required then it can’t be specified as --addr.
• The RapidJSON/json_dto libraries are no longer used in RESTinio samples/tests/benchmarks.
• CMake is now the only build system supported. The previous versions of RESTinio used CMake and our own Mxx_ru build systems. Since v.0.7.0 only CMake is used. But Mxx_ru is still in use for managing dependencies.
• RESTinio's CMake scripts have been refactored significantly. Most of the old CMake variables/options used for the configuration (like RESTINIO_FIND_DEPS) have been removed. There are several new variables/options that have to be used since v0.7.0: RESTINIO_ASIO_SOURCE, RESTINIO_DEP_STANDALONE_ASIO, RESTINIO_DEP_BOOST_ASIO, RESTINIO_DEP_LLHTTP, RESTINIO_DEP_FMT, RESTINIO_DEP_EXPECTED_LITE and so on. Please see the corresponding section in the documentation for more details.
• Several classes/methods/functions marked as deprecated in previous versions are now removed.
• The core restinio/all.hpp header file has been deprecated. It will be removed in v.0.8.0. The new core restinio/core.hpp header file must be used instead.
• The format and behavior of restinio::on_pool_runner_t::stop changed. Now it may accept on_error-callback. The default on_error-callback calls std::abort if an exception is thrown in http_server_t::close_async.
• Added support of chains of asynchronous handlers. Please see the corresponding section in the documentation for more details.
• Added a basic support for chunk extensions in incoming requests.

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This discussion was created from the release v.0.7.0.