echo-headers.py - mozsearch

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import json

def main(request, response):

    response.headers.set(b"Access-Control-Allow-Origin", b"*")

    headers = {}

    for header in request.headers:

        key = header.decode('utf-8')

        value = request.headers.get(header).decode('utf-8')

        headers[key] = value

    return json.dumps(headers)