boost-wintls
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Stream Shutdown does not produce Error on incomplete protocol shutdown
As originally mentioned in #56, Asio.SSL has error::stream_truncated. This StackOverflow Post does explain very well what it is good for: https://stackoverflow.com/questions/25587403/boost-asio-ssl-async-shutdown-always-finishes-with-an-error (I think, that stream_truncated did not exist when that post was written and corresponds to the mentioned SSL_R_SHORT_READ.)
I have added #74 to show the current behavior of Asio.SSL and WinTLS in the relevant cases.
Looking at the Schannel Docs, i suspect that the sspi_shutdown class may have to be more complex than it currently is..?
As a sidenote: The StackOverflow post mentions that Asio should produce error::eof during shutdown in some cases. I did not observe that in my tests. However, this is handled in the beast https sync/async examples and in the WinTLS async example, butn not in the WinTLS sync example. Could it be, that the information is outdated and error::eof will not occur anymore? At the very least, it seems inconsistent, that error::eof is handled in the async example, but not in the sync example.