Module: ActionController::Head

Included in:
ConditionalGet
Defined in:
actionpack/lib/action_controller/metal/head.rb

Instance Method Summary collapse

Instance Method Details

#head(status, options = nil) ⇒ Object

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.



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# File 'actionpack/lib/action_controller/metal/head.rb', line 21

def head(status, options = nil)
  if status.is_a?(Hash)
    raise ArgumentError, "#{status.inspect} is not a valid value for `status`."
  end

  status ||= :ok

  if options
    location = options.delete(:location)
    content_type = options.delete(:content_type)

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

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

  if include_content?(response_code)
    unless self.media_type
      self.content_type = content_type || ((f = formats) && Mime[f.first]) || Mime[:html]
    end

    response.charset = false
  end

  self.response_body = ""

  true
end