open uri on jruby proxy issues localhost - jruby

Question

I was originally using rsolr to generate and connect to solr cores on my local machine. This all worked fine in ruby until we moved to jruby. I now receive a 504 gateway error for localhost http requests. This comes from Open-uri. We do have a proxy and I have unset it, set it and used Net::HTTP::Proxy to attempt to connect to localhost.
The error I get is:
require 'open-uri'
open("http://127.0.0.1:8984/solr/")
OpenURI::HTTPError: 504 Gateway Time-out
from /Users/adamcryer/.rvm/rubies/jruby-1.7.4/lib/ruby/1.9/open-uri.rb:346:in `open_http'
from /Users/adamcryer/.rvm/rubies/jruby-1.7.4/lib/ruby/1.9/open-uri.rb:775:in `buffer_open'
from /Users/adamcryer/.rvm/rubies/jruby-1.7.4/lib/ruby/1.9/open-uri.rb:203:in `open_loop'
from org/jruby/RubyKernel.java:1254:in `catch'
from /Users/adamcryer/.rvm/rubies/jruby-1.7.4/lib/ruby/1.9/open-uri.rb:201:in `open_loop'
from /Users/adamcryer/.rvm/rubies/jruby-1.7.4/lib/ruby/1.9/open-uri.rb:146:in `open_uri'
from /Users/adamcryer/.rvm/rubies/jruby-1.7.4/lib/ruby/1.9/open-uri.rb:677:in `open'
from /Users/adamcryer/.rvm/rubies/jruby-1.7.4/lib/ruby/1.9/open-uri.rb:33:in `open'
from (irb):3:in `evaluate'
from org/jruby/RubyKernel.java:1093:in `eval'
from org/jruby/RubyKernel.java:1489:in `loop'
from org/jruby/RubyKernel.java:1254:in `catch'
from org/jruby/RubyKernel.java:1254:in `catch'
from /Users/adamcryer/.rvm/rubies/jruby-1.7.4/bin/irb:13:in `(root)'
I have also tried aliases for localhost -> 127.0.0.1, 0.0.0.0 and my actual local ip 192..
Any idea why this is. Can Open URI in jruby not handle redirects?
EDIT: it does connect if the real local IP is used i.e 192.... (but not on localhost, 127.0.0.1):
jruby-1.7.4 :013 > open("http://127.0.0.1:8985/solr/")
OpenURI::HTTPError: 504 Gateway Time-out
from /Users/adamcryer/.rvm/rubies/jruby-1.7.4/lib/ruby/1.9/open-uri.rb:346:in `open_http'
from /Users/adamcryer/.rvm/rubies/jruby-1.7.4/lib/ruby/1.9/open-uri.rb:775:in `buffer_open'
from /Users/adamcryer/.rvm/rubies/jruby-1.7.4/lib/ruby/1.9/open-uri.rb:203:in `open_loop'
from org/jruby/RubyKernel.java:1254:in `catch'
from /Users/adamcryer/.rvm/rubies/jruby-1.7.4/lib/ruby/1.9/open-uri.rb:201:in `open_loop'
from /Users/adamcryer/.rvm/rubies/jruby-1.7.4/lib/ruby/1.9/open-uri.rb:146:in `open_uri'
from /Users/adamcryer/.rvm/rubies/jruby-1.7.4/lib/ruby/1.9/open-uri.rb:677:in `open'
from /Users/adamcryer/.rvm/rubies/jruby-1.7.4/lib/ruby/1.9/open-uri.rb:33:in `open'
from (irb):13:in `evaluate'
from org/jruby/RubyKernel.java:1093:in `eval'
from org/jruby/RubyKernel.java:1489:in `loop'
from org/jruby/RubyKernel.java:1254:in `catch'
from org/jruby/RubyKernel.java:1254:in `catch'
from /Users/adamcryer/.rvm/rubies/jruby-1.7.4/bin/irb:13:in `(root)'
jruby-1.7.4 :014 > open("http://192.168.2.210:8985/solr/")
=> #<StringIO:0x385715 #status=["200", "OK"], #meta={"content- type"=>"text/html;charset=UTF-8", "x-cache"=>"MISS from pH-squid", "x-cache-lookup"=>"MISS from pH-squid:3128", "via"=>"1.1 pH-squid:3128 (squid/2.7.STABLE9)", "connection"=>"close"}, #base_uri=#<URI::HTTP:0x2a717ef5 URL:http://192.x.x.x:8985/solr/>>
Thanks for any help in advance
EDIT:
This is essentially a duplicate of:
Make JRuby inherit Java proxy settings

Answer 1

See Make JRuby inherit Java proxy settings
Which essentially states:
I have had the same issue. I found that java or net::http doesn't obey the nonProxyHosts option. The best way to get around this is to modify the ENV_JAVA settings to account for this.
The steps I took to ensure nonProxyHosts was used were the following:
1) JAVA_OPTS="-Dhttp.proxyHost=192*** -Dhttp.proxyPort=1234 -Dhttp.nonProxyHosts=local|127.0.0.1"
OR
1) JRUBY_OPTS="-J-Dhttp.proxyHost=192*** -J-Dhttp.proxyPort=1234 -J-Dhttp.nonProxyHosts=local|127.0.0.1"
Keep in mind that at least for java1.7 the nonProxyHosts should not have quotations see here.
Now I find that either net::http or java itself doesn't actually honour the nonProxyHosts option.
However you can get around this by doing the following in JRuby
a = URI("http://someurl")
Net::HTTP.new(a).proxy?.should == true
regex = /$#{ENV_JAVA["http.nonProxyHosts"]}/ #dollar needed to behave as expected
if a.hostname.match(regex)
ENV_JAVA["http.proxyHost"]=nil
end
Net::HTTP.new(a).proxy?.should == false
Or at least this is the only way I could get it to work