It looks like World Bank might've changed their API? This redirects to their homepage: http://iresearch.worldbank.org/PovcalNet/PovcalNetAPI.ashx?PovertyLine=30&Countries=all&YearSelected=2015&display=C&format=csv If you update the API path and the CORS proxy still isn't working, you could also try https://corsproxy.io/ (which, note, requires escaping the URL, as in their sample line of code on that page).

Thanks a lot for bringing this to my attention! I'm checking now if they have changed access to their api.