filterheaders

#!/usr/bin/env python3

import binascii
import sys


EAT_HEADERS = (
    b'CF-Connecting-IP:',
    b'CF-IPCountry:',
    b'CF-RAY:',
    b'CF-Visitor:',
    b'X-Amzn-Trace-Id:',
    b'X-Forwarded-For:',
    b'X-Forwarded-Port:',
    b'X-Forwarded-Proto:',
)


def decode_request(line):
    return binascii.unhexlify(line.strip().encode('utf-8'))

def encode_request(request):
    return binascii.hexlify(request).decode('utf-8') + '\n'

def handle_request(request_text):
    lines = request_text.splitlines(keepends=True)
    output = []
    output.append(lines.pop(0)) # message header

    for line in lines:
        if not line.startswith(EAT_HEADERS):
            output.append(line)

    return b''.join(output)


def main():
    while True:
        line = sys.stdin.readline()
        if not line:
            break
        in_ = decode_request(line)
        out = handle_request(in_)
        if out is not None:
            sys.stdout.write(encode_request(out))

if __name__ == "__main__":
    main()