I scrape data for a living, and most of that job is the same fight over and over: a site has data I need, and it really doesn't want me to have it. This is the story of one wall that beat every trick in the usual playbook — and what finally worked. The target I needed a set of listings from a large classifieds site (mobile.de — car listings). Nothing exotic: title, price, a few fields per listing. The kind of thing that should take twenty minutes. It took a lot more than twenty minutes....