9   { headers: { upgrade: 'h2c' }, expected: 'regular' },  property
10   { headers: { connection: 'upgrade' }, expected: 'regular' },
11   { headers: { connection: 'upgrade', upgrade: 'h2c' }, expected: 'upgrade' },  property
12   { headers: { connection: 'upgrade', upgrade: 'h2c' }, expected: 'destroy' },  property
13   { headers: { connection: 'upgrade', upgrade: 'h2c' }, expected: 'regular' },  property
39       server.removeAllListeners('upgrade');
43     req.on('upgrade', function onUpgrade(res, socket) {
45       done('upgrade');
54     Connection: 'upgrade, keep-alive',
55     Upgrade: 'h2c'  property
58 }).on('upgrade', function(req, socket) {
60              'Connection: upgrade\r\n' +
61              'Upgrade: h2c\r\n\r\n' +