Minor feature and bugfix release with the following changes:

• Added MacOS darwin-ssl support #549
• Added an option to split a request preparation from its execution #533
• cpr::Session is now movable #544
• Not overriding BUILD_TESTING as cache variable any more #561
• Avoid recursive template instantiation in priv::set_option() #540
• Do not move targets in to a bin if cpr is a sub project #531

In this release the CMake integration has been refactored to fix a bunch of SSL issues.
During this change all relevant CMake variable names changed.
Here are the new ones:

-- =======================================================
--   CPR_GENERATE_COVERAGE: OFF
--   CPR_CURL_NOSIGNAL: OFF
--   CPR_USE_SYSTEM_GTEST: OFF
--   CPR_FORCE_USE_SYSTEM_CURL: OFF
--   CPR_ENABLE_SSL: ON
--   CPR_FORCE_OPENSSL_BACKEND: OFF
--   CPR_FORCE_WINSSL_BACKEND: OFF
--   CPR_BUILD_TESTS: ON
--   CPR_BUILD_TESTS_SSL: ON
-- =======================================================

Documentation for those can be found here: https://github.com/whoshuu/cpr/blob/aac5058a15e9ad5ad393973dc6fe44d7614a7f55/CMakeLists.txt#L30-L40

If neither CPR_FORCE_OPENSSL_BACKEND nore CPR_FORCE_WINSSL_BACKEND has been set to ON, CMake will try to automatically detect the best SSL backend for your system (WinSSL - Windows, OpenSSL - Linux & Mac, ...).

How to build on Windows

With WinSSL

mkdir build
cd build
cmake .. -DCPR_BUILD_TESTS_SSL=OFF # SSL test are only supported with OpenSSL
cmake --build .

With OpenSSL

mkdir build
cd build
cmake .. -DCPR_FORCE_OPENSSL_BACKEND=ON # Disable auto detect and force OpenSSL
cmake --build .

Changes

• Added support for GCC10 static analysis
• Added an option to retrieve the std::shared_ptr<CurlHolder> from a session
• Added UpdateHeader(const Header& header) support #506
• Added support for retrieving certificate information #453
• Added urlDecode(std::string) for url decoding
• Add BearerToken support #465
• Explicit move operator for StringHolder
• cpr::Session cleanup and allow the compiler to generate the needed constructor
• Updated curl from 7.69.1 to 7.75.0 #529
• Compatibility for libcurl <= 7.60
• Less auto and more explicit types
• Refactored the CMake variables #529
• Change listening ports used for tests
• Fixed AbstractServer data race
• Fixed Windows OpenSSL builds #529
• Fixed Windows SSL backend detection #529
• Fixed ReadCallback will reset Header #517
• Fixed the Windows OpenSSL CI build

This hotfix for v1.5.1 includes the following fixes:

• Fixed: cpr::Post wrong content length (#450, #456, #458)
• Fixed: Mutex for multithreaded access not being static
• Fixed: No const rvalue references (#424)

Changes

• CMake add ability to use WINSSL (#404)
• Thread save access to libCurl (#313)
• Allow implicit creation of cpr:Url, cpr:Body and cpr:UserAgent (#411)
• Payload with string variables (#409)
• Cleanup (#407, #408)

Changes

• Updated CURL to curl-7_69_1 (#343)
• Updated mongoose to 6.18
• Updated googletest to release-1.10.0
• Refactored the mongoose test server setup
• Added SSL options (#276)
• Fixed URL encoding (#379)
• Fixed Windows std::min type deduction
• GitHub Actions CI (#393)
• Refactored all the CMake stuff (#383)
• Fixed passing correct data type when setting CURLOPT_POSTFIELDSIZE_LARGE
• Switched Body, UserAgent and Url from std::string derivation classes to string holder classes (#303)
• General cleanup of the code base