Incoming Salmon requests can be turned into follows and unfollows

config/initializers/ostatus.rb

@@ -1,6 +1,7 @@
-LOCAL_DOMAIN = ENV['LOCAL_DOMAIN'] || 'localhost'
-HUB_URL      = ENV['HUB_URL'] || 'https://pubsubhubbub.superfeedr.com'
+LOCAL_DOMAIN       = ENV['LOCAL_DOMAIN'] || 'localhost'
+HUB_URL            = ENV['HUB_URL']      || 'https://pubsubhubbub.superfeedr.com'
+CANONICAL_PROTOCOL = ENV['LOCAL_HTTPS'] == 'true' ? 'https://' : 'http://'
 
 Rails.application.configure do
-  config.action_mailer.default_url_options = { host: LOCAL_DOMAIN }
+  config.action_mailer.default_url_options = { host: LOCAL_DOMAIN, protocol: CANONICAL_PROTOCOL }
 end