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-rw-r--r--actionview/lib/action_view/helpers/asset_url_helper.rb5
1 files changed, 4 insertions, 1 deletions
diff --git a/actionview/lib/action_view/helpers/asset_url_helper.rb b/actionview/lib/action_view/helpers/asset_url_helper.rb
index d86e7e490c..006b15be91 100644
--- a/actionview/lib/action_view/helpers/asset_url_helper.rb
+++ b/actionview/lib/action_view/helpers/asset_url_helper.rb
@@ -88,9 +88,12 @@ module ActionView
# still sending assets for plain HTTP requests from asset hosts. If you don't
# have SSL certificates for each of the asset hosts this technique allows you
# to avoid warnings in the client about mixed media.
+ # Note that the request parameter might not be supplied, e.g. when the assets
+ # are precompiled via a Rake task. Make sure to use a Proc instead of a lambda,
+ # since a Proc allows missing parameters and sets them to nil.
#
# config.action_controller.asset_host = Proc.new { |source, request|
- # if request.ssl?
+ # if request && request.ssl?
# "#{request.protocol}#{request.host_with_port}"
# else
# "#{request.protocol}assets.example.com"