send_file_headers!

# File actionpack/lib/action_controller/metal/data_streaming.rb, line 133 def send_file_headers!(options) type_provided = options.has_key?(:type) content_type = options.fetch(:type, DEFAULT_SEND_FILE_TYPE) raise ArgumentError, ":type option required" if content_type.nil? if content_type.is_a?(Symbol) extension = Mime[content_type] raise ArgumentError, "Unknown MIME type #{options[:type]}" unless extension self.content_type = extension else if !type_provided && options[:filename] # If type wasn't provided, try guessing from file extension. content_type = Mime::Type.lookup_by_extension(File.extname(options[:filename]).downcase.delete('.')) || content_type end self.content_type = content_type end disposition = options.fetch(:disposition, DEFAULT_SEND_FILE_DISPOSITION) unless disposition.nil? disposition = disposition.to_s disposition += %(; filename="#{options[:filename]}") if options[:filename] headers['Content-Disposition'] = disposition end headers['Content-Transfer-Encoding'] = 'binary' response.sending_file = true # Fix a problem with IE 6.0 on opening downloaded files: # If Cache-Control: no-cache is set (which Rails does by default), # IE removes the file it just downloaded from its cache immediately # after it displays the "open/save" dialog, which means that if you # hit "open" the file isn't there anymore when the application that # is called for handling the download is run, so let's workaround that response.cache_control[:public] ||= false end