add client size close for 0.13-release#719

deanberris merged 2 commits intocpp-netlib:0.13-releasecpp-netlib/cpp-netlib:0.13-releasefrom

chenzhaoyu:add-active-client-side-close-0.13-releasechenzhaoyu/cpp-netlib:add-active-client-side-close-0.13-releaseCopy head branch name to clipboard