edge badge
Methods
H
Instance Public methods
head(status, options = {})

Returns a response that has no content (merely headers). The options argument is interpreted to be a hash of header names and values. This allows you to easily return a response that consists only of significant headers:

head :created, location: person_path(@person)

head :created, location: @person

It can also be used to return exceptional conditions:

return head(:method_not_allowed) unless request.post?
return head(:bad_request) unless valid_request?
render

See Rack::Utils::SYMBOL_TO_STATUS_CODE for a full list of valid status symbols.

# File actionpack/lib/action_controller/metal/head.rb, line 19
    def head(status, options = {})
      if status.is_a?(Hash)
        msg = status[:status] ? 'The :status option' : 'The implicit :ok status'
        options, status = status, status.delete(:status)

        ActiveSupport::Deprecation.warn("          #{msg} on `head` has been deprecated and will be removed in Rails 5.1.
          Please pass the status as a separate parameter before the options, instead.
".squish)
      end

      status ||= :ok
      
      location = options.delete(:location)
      content_type = options.delete(:content_type)

      options.each do |key, value|
        headers[key.to_s.dasherize.split('-').each { |v| v[0] = v[0].chr.upcase }.join('-')] = value.to_s
      end

      self.status = status
      self.location = url_for(location) if location

      self.response_body = ""

      if include_content?(self.response_code)
        self.content_type = content_type || (Mime[formats.first] if formats)
        self.response.charset = false if self.response
      else
        headers.delete('Content-Type')
        headers.delete('Content-Length')
      end
      
      true
    end