Custom spider argument support #14
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* Introduced ArachnadoCrawlSpider to support CrawlSpider based spiders.
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This PR introduces similar behavior about custom spider arguments where arguments are embedded into the
requestunder process.The trick had to be done in
set_spider_class_argsis, creating a new class type based on original spider class to prevent arguments set in previous requests be persistent.The arguments could also be set after object instantiation but that would break the behavior compatibility with
scrapy.Spiderwhere arguments are already available in__init__method.