Cześć Maciek :) In general, you can pass extra arguments when you call addCallback(s) or addErrback. They will get passed to the callback.
However, as a side note to that code example, do you understand the difference between .addCallbacks(cb, eb) and: .addCallback(cb).addErrback(eb) and: .addErrback(eb).addCallback(cb) ... Also, keep in mind that you only errback when there is an issue setting up the connection. If the server successfully responds with an error (say, a 404 Not Found, or something), the callback will be called with the response object. So, your question doesn't make a lot of sense to me: if the errback gets called, there's not really a response! Also, if you want to do scraping with Twisted, consider looking at Scrapy, a fully-featured web scraper that uses Twisted internally. pozdrawiam lvh
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