Be sure to test that the outbound data buffer is clear
Be sure to test that the outbound data buffer is clear

vladmunteanu/hyper-h2,python-hyper/hyper-h2,python-hyper/hyper-h2,vladmunteanu/hyper-h2,Kriechi/hyper-h2,Kriechi/hyper-h2,bhavishyagopesh/hyper-h2