[Indiana Law Journal] AWS WAF 'challenge' (HTTP 403) for https://www.repository.law.indiana.edu/context/ilj/article/1208/viewcontent/21_83IndLJ537_2008_.pdf; retrying with fallback UA [Indiana Law Journal] HTTP 403 for https://www.repository.law.indiana.edu/context/ilj/article/1208/viewcontent/21_83IndLJ537_2008_.pdf (fallback UA); retrying after 3.2s [Indiana Law Journal] HTTP 403 for https://www.repository.law.indiana.edu/context/ilj/article/1208/viewcontent/21_83IndLJ537_2008_.pdf (fallback UA); retrying after 4.8s [Indiana Law Journal] Retrying download with curl fallback [Indiana Law Journal] curl fallback returned 22 for https://www.repository.law.indiana.edu/context/ilj/article/1208/viewcontent/21_83IndLJ537_2008_.pdf: curl: (22) The requested URL returned error: 403 [Indiana Law Journal] Retrying download with HTTP session fallback