Fix redircetion with multiple Location headers

Resolves: #585

lib/http/redirector.rb

@@ -58,7 +58,8 @@ def perform(request, response)
 
         @response.flush
 
-        @request  = redirect_to @response.headers[Headers::LOCATION]
+        # XXX(ixti): using `Array#inject` to return `nil` if no Location header.
+        @request  = redirect_to(@response.headers.get(Headers::LOCATION).inject(:+))
         @response = yield @request
       end
 

spec/lib/http/redirector_spec.rb

@@ -76,6 +76,19 @@ def redirect_response(status, location)
       expect(res.to_s).to eq "foo"
     end
 
+    it "concatenates multiple Location headers" do
+      req     = HTTP::Request.new :verb => :head, :uri => "http://example.com"
+      headers = HTTP::Headers.new
+
+      %w[http://example.com /123].each { |loc| headers.add("Location", loc) }
+
+      res = redirector.perform(req, simple_response(301, "", headers)) do |redirect|
+        simple_response(200, redirect.uri.to_s)
+      end
+
+      expect(res.to_s).to eq "http://example.com/123"
+    end
+
     context "following 300 redirect" do
       context "with strict mode" do
         let(:options) { {:strict => true} }