forked from boostorg/beast
- websocket supports cancellation. - Iterating test for ws cancellation. - Only terminal cancellation is forwarded by default. - basic_stream supports cancellation. - supported cancellation is documented. - http cancellation additions. - Added cancellation_slot tests to http, utils and saved_handler. - Added post to write.cpp, to avoid SIGSEV in test. - Refresher describes cancellation in more detail.