Net::HTTP and Nokogiri - undefined method `body' for nil:NilClass (NoMethodError) - ruby

Question

Thanks for your time. Somewhat new to OOP and Ruby and after synthesizing solutions from a few different stack overflow answers I've got myself turned around.
My goal is to write a script that parses a CSV of URLs using Nokogiri library. After trying and failing to use open-uri and the open-uri-redirections plugin to follow redirects, I settled on Net::HTTP and that got me moving...until I ran into URLs that have a 302 redirect specifically.
Here's the method I'm using to engage the URL:
require 'Nokogiri'
require 'Net/http'
require 'csv'
def fetch(uri_str, limit = 10)
# You should choose better exception.
raise ArgumentError, 'HTTP redirect too deep' if limit == 0
url = URI.parse(uri_str)
#puts "The value of uri_str is: #{ uri_str}"
#puts "The value of URI.parse(uri_str) is #{ url }"
req = Net::HTTP::Get.new(url.path, { 'User-Agent' => 'Mozilla/5.0 (etc...)' })
# puts "THE URL IS #{url.scheme + ":" + url.host + url.path}" # just a reporter so I can see if it's mangled
response = Net::HTTP.start(url.host, url.port, :use_ssl => url.scheme == 'https') { |http| http.request(req) }
case response
when Net::HTTPSuccess then response
when Net::HTTPRedirection then fetch(response['location'], limit - 1)
else
#puts "Problem clause!"
response.error!
end
end
Further down in my script I take an ARGV with the URL csv filename, do CSV.read, encode the URL to a string, then use Nokogiri::HTML.parse to turn it all into something I can use xpath selectors to examine and then write to an output CSV.
Works beautifully...so long as I encounter a 200 response, which unfortunately is not every website. When I run into a 302 I'm getting this:
C:/Ruby24-x64/lib/ruby/2.4.0/Net/http.rb:1570:in `addr_port': undefined method `+' for nil:NilClass (NoMethodError)
from C:/Ruby24-x64/lib/ruby/2.4.0/Net/http.rb:1503:in `begin_transport'
from C:/Ruby24-x64/lib/ruby/2.4.0/Net/http.rb:1442:in `transport_request'
from C:/Ruby24-x64/lib/ruby/2.4.0/Net/http.rb:1416:in `request'
from httpcsv.rb:14:in `block in fetch'
from C:/Ruby24-x64/lib/ruby/2.4.0/Net/http.rb:877:in `start'
from C:/Ruby24-x64/lib/ruby/2.4.0/Net/http.rb:608:in `start'
from httpcsv.rb:14:in `fetch'
from httpcsv.rb:17:in `fetch'
from httpcsv.rb:42:in `block in <main>'
from C:/Ruby24-x64/lib/ruby/2.4.0/csv.rb:866:in `each'
from C:/Ruby24-x64/lib/ruby/2.4.0/csv.rb:866:in `each'
from httpcsv.rb:38:in `<main>'
I know I'm missing something right in front of me but I can't tell what I should puts to see if it is nil. Any help is appreciated, thanks in advance.