Mar 14, 2019 · Mar 13, 2019
diff --git a/reference/configuration/framework.rst b/reference/configuration/framework.rst
  * :ref:`enabled <reference-csrf_protection-enabled>`

 * `default_locale`_
 * `disallow_search_engine_index`_
 * `esi`_

  * :ref:`enabled <reference-esi-enabled>`
    You can read more information about the default locale in
    :ref:`translation-default-locale`.

 disallow_search_engine_index
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 **type**: ``boolean`` **default**: ``true`` when the debug mode is enabled, ``false`` otherwise.

 .. versionadded:: 4.3

    The ``disallow_search_engine_index`` option was introduced in Symfony 4.3.

 If ``true``, Symfony adds a ``X-Robots-Tag: noindex`` HTTP tag to all responses
 (unless your own app adds that header, in which case it's not modified). This
 `X-Robots-Tag HTTP header`_ tells search engines to not index your web site.
 This option is a protection measure in case you accidentally publish your site
 in debug mode.

 trusted_hosts
 ~~~~~~~~~~~~~

 .. _`CSRF security attacks`: https://en.wikipedia.org/wiki/Cross-site_request_forgery
 .. _`session.sid_length PHP option`: https://php.net/manual/session.configuration.php#ini.session.sid-length
 .. _`session.sid_bits_per_character PHP option`: https://php.net/manual/session.configuration.php#ini.session.sid-bits-per-character
 .. _`X-Robots-Tag HTTP header`: https://developers.google.com/search/reference/robots_meta_tag
Original file line number	Diff line number	Diff line change
Expand Up		@@ -73,6 +73,7 @@ Configuration
		* :ref:`enabled <reference-csrf_protection-enabled>`

		* `default_locale`_
		* `disallow_search_engine_index`_
		* `esi`_

		* :ref:`enabled <reference-esi-enabled>`
Expand DownExpand Up		@@ -384,6 +385,21 @@ method.
		You can read more information about the default locale in
		:ref:`translation-default-locale`.

		disallow_search_engine_index
		~~~~~~~~~~~~~~~~~~~~~~~~~~~~

		type: ``boolean`` default: ``true`` when the debug mode is enabled, ``false`` otherwise.

		.. versionadded:: 4.3

		The ``disallow_search_engine_index`` option was introduced in Symfony 4.3.

		If ``true``, Symfony adds a ``X-Robots-Tag: noindex`` HTTP tag to all responses
		(unless your own app adds that header, in which case it's not modified). This
		`X-Robots-Tag HTTP header`_ tells search engines to not index your web site.
		This option is a protection measure in case you accidentally publish your site
		in debug mode.

		trusted_hosts
		~~~~~~~~~~~~~

Expand DownExpand Up		@@ -2340,3 +2356,4 @@ a :doc:`normal workflow </workflow/usage>` or a :doc:`state machine </workflow/s
		.. _`CSRF security attacks`: https://en.wikipedia.org/wiki/Cross-site_request_forgery
		.. _`session.sid_length PHP option`: https://php.net/manual/session.configuration.php#ini.session.sid-length
		.. _`session.sid_bits_per_character PHP option`: https://php.net/manual/session.configuration.php#ini.session.sid-bits-per-character
		.. _`X-Robots-Tag HTTP header`: https://developers.google.com/search/reference/robots_meta_tag