Merge pull request #18 from Shopify/fix-regexp-modifier

Author: nurse

lib/net/http/generic_request.rb

@@ -143,7 +143,7 @@ def update_uri(addr, port, ssl) # :nodoc: internal use only
     end
 
     if host = self['host']
-      host.sub!(/:.*/s, ''.freeze)
+      host.sub!(/:.*/m, ''.freeze)
     elsif host = @uri.host
     else
      host = addr