def secure_headers(headers):
    for header in headers:
        if header[0] in _SECURE_HEADERS:
            yield NeverIndexedHeaderTuple(*header)
        elif header[0] in (b'cookie', u'cookie') and len(header[1]) < 20:
            yield NeverIndexedHeaderTuple(*header)
        else:
            yield header
Certain headers are at risk of being attacked during the header compression
dataset/ETHPy150Open python-hyper/hyper-h2/h2/utilities.py/secure_headers