echo-request-headers.py

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import json

def session_established(session):

    headers = {}

    for name, value in session.request_headers:

        headers[name.decode('utf-8')] = value.decode('utf-8')

    stream_id = session.create_unidirectional_stream()

    data = json.dumps(headers).encode('utf-8')

    session.send_stream_data(stream_id, data, end_stream=True)