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Issue #2531 asked for connect() to expose error detail the way ClientImpl/SSLClient do via Result, instead of collapsing every failure into a bare bool. The groundwork (detail::ClientTlsSessionError) was already laid during the WebSocketClient/SSLClient dedup but left unwired. - Add httplib::ws::Result: explicit operator bool(), error(), and flattened upgrade-response accessors (status(), headers(), get_header_value(), has_header()); ssl_error()/ssl_backend_error() on SSL builds. - Add Error::WebSocketHandshake for upgrade-validation failures (non-101 status, bad Sec-WebSocket-Accept, bad Upgrade/Connection headers). - Extract detail::parse_status_line from ClientImpl::read_response_line and reuse it in read_websocket_upgrade_response, replacing the previous "HTTP/1.1 101" substring match with a proper parse. Non-101 responses now surface their status and headers instead of being read and discarded. - Wire WebSocketClient::create_stream() to capture ClientTlsSessionError so TLS failures (SSLServerVerification, SSLServerHostnameVerification, ...) reach the caller with backend error codes. - Update tests and README-websocket.md accordingly. This is a source-breaking change for callers that assign the result to bool (e.g. bool ok = cli.connect();); if (cli.connect()) and gtest's ASSERT_TRUE/EXPECT_FALSE(...) macros are unaffected since operator bool still participates in contextual conversion.
