I want to use asio::ssl over the http proxy. sample code: ---- io_service i; tcp::socket t( i ); ssl::context c( i, ssl::context::sslv3_client ); ssl::streamtcp::socket& s( t, c ); tcp::resolver r( i ); tcp::resolver::query q( "proxy.example.com", "3128" ); t.connect( *r.resolve( q ) ); write( t, buffer( "CONNECT www.example.com:443 HTTP/1.0\r\n\r\n" ) ); asio::streambuf res; read_until( t, res, "\r\n\r\n" ); cout << &res; // => "HTTP/1.0 200 Connection established\r\n\r\n" error_code e; s.handshake( ssl::stream_base::client, e ); if( e ){ cout << "handshake() failed: " << e.message() << endl; // e.message() => "End of file" return 1; } write( s, buffer( "GET / HTTP/1.0\r\n\r\n" ) ); while( read( s, res, transfer_at_least(1), e ) ) cout << &res; ---- The http proxy returns correct response. But handshake() failed. What should I do?