Use a slightly faster method to check if header is surrounded by whitespace
Use a slightly faster method to check if header is surrounded by whitespace

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