Last week, the Nature articles were parsed successfully. Now it’s just sending an ePub with “Client challenge”. Here’s an example: What The Odyssey reveals about ancient science — from botany to psychiatry
Hi @dmal: “Client challenge” means, nature.com is using anti-bot techniques to prevent content stealing and/or AI content crawling. As these bots using methods similar to P2K, some websites are also blocking P2K.
But if you are using the plugin for desktop browsers or the bookmarklet for desktop and mobile, you can push the already retrieved content to P2K. This also helps for paid content behind a paywall.
get plugin/bookmarklet at Push to Kindle - Getting Started