In Ruby 2.3, if the argument to open-uri is http and the host redirects to https , then open-uri would throw an error.
1 2> require 'open-uri' 3> open('http://www.google.com/gmail') 4 5RuntimeError: redirection forbidden: http://www.google.com/gmail -> https://www.google.com/gmail/ 6
To get around this issue, we could use open_uri_redirections gem.
1 2> require 'open-uri' 3> require 'open_uri_redirections' 4> open('http://www.google.com/gmail/', :allow_redirections => :safe) 5 6=> #<Tempfile:/var/folders/jv/fxkfk9_10nb_964rvrszs2540000gn/T/open-uri20170228-41042-2fffoa> 7
In Ruby 2.4, this issue is fixed. So now http to https redirection is possible using open-uri.
1 2> require 'open-uri' 3> open('http://www.google.com/gmail') 4=> #<Tempfile:/var/folders/jv/fxkfk9_10nb_964rvrszs2540000gn/T/open-uri20170228-41077-1bkm1dv> 5
Note that redirection from https to http will raise an error, like it did in previous versions, since that has possible security concerns.