ActionDispatch::Http::MimeNegotiation

Namespace

Class

ActionDispatch::Http::MimeNegotiation::InvalidType

Methods

accepts
content_mime_type
format
format=
formats
formats=
negotiate_mime
return_only_media_type_on_content_type
return_only_media_type_on_content_type=
should_apply_vary_header?
variant
variant=

Constants

BROWSER_LIKE_ACCEPTS	=	/,\s\\/\\|\\/\\s,/
	We use normal content negotiation unless you include / in your list, in which case we assume you’re a browser and send HTML.
RESCUABLE_MIME_FORMAT_ERRORS	=	[ ActionController::BadRequest, ActionDispatch::Http::Parameters::ParseError, ]

Instance Public methods

accepts()

Returns the accepted MIME type for the request.

📝 Source code

# File actionpack/lib/action_dispatch/http/mime_negotiation.rb, line 54
      def accepts
        fetch_header("action_dispatch.request.accepts") do |k|
          header = get_header("HTTP_ACCEPT").to_s.strip

          v = if header.empty?
            [content_mime_type]
          else
            Mime::Type.parse(header)
          end
          set_header k, v
        rescue ::Mime::Type::InvalidMimeType => e
          raise InvalidType, e.message
        end
      end

🔎 See on GitHub

content_mime_type()

The MIME type of the HTTP request, such as Mime.

📝 Source code

# File actionpack/lib/action_dispatch/http/mime_negotiation.rb, line 36
      def content_mime_type
        fetch_header("action_dispatch.request.content_type") do |k|
          v = if get_header("CONTENT_TYPE") =~ /^([^,;]*)/
            Mime::Type.lookup($1.strip.downcase)
          else
            nil
          end
          set_header k, v
        rescue ::Mime::Type::InvalidMimeType => e
          raise InvalidType, e.message
        end
      end

🔎 See on GitHub

format(_view_path = nil)

Returns the MIME type for the format used in the request.

GET /posts/5.xml   | request.format => Mime[:xml]
GET /posts/5.xhtml | request.format => Mime[:html]
GET /posts/5       | request.format => Mime[:html] or Mime[:js], or request.accepts.first

📝 Source code

# File actionpack/lib/action_dispatch/http/mime_negotiation.rb, line 75
      def format(_view_path = nil)
        formats.first || Mime::NullType.instance
      end

🔎 See on GitHub

format=(extension)

Sets the format by string extension, which can be used to force custom formats that are not controlled by the extension.

class ApplicationController < ActionController::Base
  before_action :adjust_format_for_iphone

  private
    def adjust_format_for_iphone
      request.format = :iphone if request.env["HTTP_USER_AGENT"][/iPhone/]
    end
end

📝 Source code

# File actionpack/lib/action_dispatch/http/mime_negotiation.rb, line 127
      def format=(extension)
        parameters[:format] = extension.to_s
        set_header "action_dispatch.request.formats", [Mime::Type.lookup_by_extension(parameters[:format])]
      end

🔎 See on GitHub

formats()

📝 Source code

# File actionpack/lib/action_dispatch/http/mime_negotiation.rb, line 79
      def formats
        fetch_header("action_dispatch.request.formats") do |k|
          v = if params_readable?
            Array(Mime[parameters[:format]])
          elsif use_accept_header && valid_accept_header
            accepts.dup
          elsif extension_format = format_from_path_extension
            [extension_format]
          elsif xhr?
            [Mime[:js]]
          else
            [Mime[:html]]
          end

          v.select! do |format|
            format.symbol || format.ref == "*/*"
          end

          set_header k, v
        end
      end

🔎 See on GitHub

formats=(extensions)

Sets the formats by string extensions. This differs from format= by allowing you to set multiple, ordered formats, which is useful when you want to have a fallback.

In this example, the :iphone format will be used if it’s available, otherwise it’ll fallback to the :html format.

class ApplicationController < ActionController::Base
  before_action :adjust_format_for_iphone_with_html_fallback

  private
    def adjust_format_for_iphone_with_html_fallback
      request.formats = [ :iphone, :html ] if request.env["HTTP_USER_AGENT"][/iPhone/]
    end
end

📝 Source code

# File actionpack/lib/action_dispatch/http/mime_negotiation.rb, line 146
      def formats=(extensions)
        parameters[:format] = extensions.first.to_s
        set_header "action_dispatch.request.formats", extensions.collect { |extension|
          Mime::Type.lookup_by_extension(extension)
        }
      end

🔎 See on GitHub

negotiate_mime(order)

Returns the first MIME type that matches the provided array of MIME types.

📝 Source code

# File actionpack/lib/action_dispatch/http/mime_negotiation.rb, line 154
      def negotiate_mime(order)
        formats.each do |priority|
          if priority == Mime::ALL
            return order.first
          elsif order.include?(priority)
            return priority
          end
        end

        order.include?(Mime::ALL) ? format : nil
      end

🔎 See on GitHub

return_only_media_type_on_content_type()

📝 Source code

# File actionpack/lib/action_dispatch/http/mime_negotiation.rb, line 27
        def return_only_media_type_on_content_type
          ActionDispatch.deprecator.warn(
            "`config.action_dispatch.return_only_request_media_type_on_content_type` is deprecated and will" \
            " be removed in Rails 7.2."
          )
        end

🔎 See on GitHub

return_only_media_type_on_content_type=(value)

📝 Source code

# File actionpack/lib/action_dispatch/http/mime_negotiation.rb, line 20
        def return_only_media_type_on_content_type=(value)
          ActionDispatch.deprecator.warn(
            "`config.action_dispatch.return_only_request_media_type_on_content_type` is deprecated and will" \
              " be removed in Rails 7.2."
          )
        end

🔎 See on GitHub

should_apply_vary_header?()

📝 Source code

# File actionpack/lib/action_dispatch/http/mime_negotiation.rb, line 166
      def should_apply_vary_header?
        !params_readable? && use_accept_header && valid_accept_header
      end

🔎 See on GitHub

variant()

📝 Source code

# File actionpack/lib/action_dispatch/http/mime_negotiation.rb, line 112
      def variant
        @variant ||= ActiveSupport::ArrayInquirer.new
      end

🔎 See on GitHub

variant=(variant)

Sets the variant for template.

📝 Source code

# File actionpack/lib/action_dispatch/http/mime_negotiation.rb, line 102
      def variant=(variant)
        variant = Array(variant)

        if variant.all?(Symbol)
          @variant = ActiveSupport::ArrayInquirer.new(variant)
        else
          raise ArgumentError, "request.variant must be set to a Symbol or an Array of Symbols."
        end
      end

🔎 See on GitHub