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Updated Code with Custom Headers Feature
Modified get_args function: Added --headers argument to accept custom headers.
Updated main function: Processed the custom headers and passed them to the Scrapy execute command.
How to Use the New Feature
python your_script.py -u http://example.com --headers 'User-Agent: CustomAgent, X-Custom-Header: Value'
This will add these headers to the requests made by your Scrapy spider.