Take first response_headers location when replacing host

Author: pex

lib/rack/reverse_proxy.rb

@@ -79,7 +79,7 @@ def proxy(env, source_request, matcher)
 
       # Replace the location header with the proxy domain
       if response_headers['location'] && options[:replace_response_host]
-        response_location = URI(response_headers['location'])
+        response_location = URI(response_headers['location'][0])
         response_location.host = source_request.host
         response_headers['location'] = response_location.to_s
       end