def remove_header(headers, name):
    """
    Removes the named header from the list of headers.  Returns the
    value of that header, or None if no header found.  If multiple
    headers are found, only the last one is returned.
    """
    name = name.lower()
    i = 0
    result = None
    while i < len(headers):
        if headers[i][0].lower() == name:
            result = headers[i][1]
            del headers[i]
            continue
        i += 1
    return result