yhirose 1c2607cbb8 Merge the SSLClient and WebSocketClient TLS session setup ...

SSLClient::initialize_ssl kept its own copy of the session setup that
detail::setup_client_tls_session already implemented for WebSocketClient.
Extend the shared function with the pieces only SSLClient needed - a session
verifier, an independent hostname verification flag, the context mutex,
Windows Schannel verification and error details - and let initialize_ssl
build a ClientTlsSessionOptions and call it. All of them default, so
WebSocketClient's call site is unchanged.

This settles one difference between the two: WebSocketClient used to call
tls::set_hostname for named hosts, which on OpenSSL turns on verification
during the handshake, while SSLClient always set SNI only and verified
post-handshake. The shared function now does the latter for both, so
tls::set_hostname loses its last caller and goes away, as does the
write-only SSLClient::verify_result_.

Certificate verification with a host name rather than an IP literal was the
one combination the WebSocket tests never covered, and it is exactly the
path this normalizes. WebSocketSSLDnsHostTest fills that in; cert2 gains a
DNS:localhost SAN so a name can be verified against it.

2026-08-07 13:41:39 -04:00

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