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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def reconstruct_headers(self, response):
 """ Purpose of this method is to reconstruct the headers dictionary that is normally passed in with a "response" object from scrapy. Args: response: A scrapy response object Returns: A dictionary that mirrors the "response.headers" dictionary that is normally within a response object Raises: None Reason: Originally, there was a bug where the json.dumps() did not properly serialize the headers. This method is a way to circumvent the known issue """


        header_dict = {}
        # begin reconstructing headers from scratch...
        for key in list(response.headers.keys()):
            key_item_list = []
            key_list = response.headers.getlist(key)
            for item in key_list:
                key_item_list.append(item)
            header_dict[key] = key_item_list
        return header_dict