M-x eww with Emacs-24.5 -Q on Debian 8, for example with the address "http://google.com" (or just "google.com"). And receive the error message in the subject line, in other words: I can't use eww at all for internet addresses, what the heck is going on?
Glenn Morris on the emacs.bugs mailing list pointed out a bug of emacs-24.5. One has to delete the cookie caching file saved in
url-cookie-file because it can became saved in an incorrect format. http://debbugs.gnu.org/cgi/bugreport.cgi?bug=21370