inspect-headers.py

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def main(request, response):

    headers = []

    if b"headers" in request.GET:

        checked_headers = request.GET.first(b"headers").split(b"|")

        for header in checked_headers:

            if header in request.headers:

                headers.append((b"x-request-" + header, request.headers.get(header, b"")))

    if b"cors" in request.GET:

        if b"Origin" in request.headers:

            headers.append((b"Access-Control-Allow-Origin", request.headers.get(b"Origin", b"")))

        else:

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

        headers.append((b"Access-Control-Allow-Credentials", b"true"))

        headers.append((b"Access-Control-Allow-Methods", b"GET, POST, HEAD"))

        exposed_headers = [b"x-request-" + header for header in checked_headers]

        headers.append((b"Access-Control-Expose-Headers", b", ".join(exposed_headers)))

        if b"allow_headers" in request.GET:

            headers.append((b"Access-Control-Allow-Headers", request.GET[b'allow_headers']))

        else:

            headers.append((b"Access-Control-Allow-Headers", b", ".join(request.headers)))

    headers.append((b"content-type", b"text/plain"))

    return headers, b""