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why scrapy works (sometimes) on WeatherUnderground ?

 I'm a newbie scrapping and following your amazing tutorials finally I mede a spider for Weather Underground. I want to download the daily log of a station. (See for example this test-page)

It works !  But I did not expect to work before adding Splash, because inspecting the page, the final table is rendered by a JS code.

Why is this working? Can I rely on this spider or maybe it will broke sometimes due to rendering issues ? 

Maybe is a silly question, but I can't imagine what's going on.


Willy Pregliasco, Bariloche, Argentina

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