Jan 4, 2018 · Jan 2, 2018
diff --git a/reference/constraints/Url.rst b/reference/constraints/Url.rst

 **type**: ``boolean`` **default**: ``false``

 .. versionadded:: 4.1
    This option was deprecated in Symfony 4.1 and will be removed in Symfony 5.0,
    because checking the DNS records is not reliable enough to validate the
    existence of the host. Use the :phpfunction:`checkdnsrr` PHP function if you
    still want to use this kind of validation.

 By default, this constraint just validates the syntax of the given URL. If you
 also need to check whether the associated host exists, set the ``checkDNS``
 option to ``true``:

 **type**: ``string`` **default**: ``The host could not be resolved.``

 .. versionadded:: 4.1
    This option was deprecated in Symfony 4.1 and will be removed in Symfony 5.0,
    because checking the DNS records is not reliable enough to validate the
    existence of the host. Use the :phpfunction:`checkdnsrr` PHP function if you
    still want to use this kind of validation.

 This message is shown when the ``checkDNS`` option is set to ``true`` and the
 DNS check failed.
Original file line number	Diff line number	Diff line change
Expand Up		@@ -231,6 +231,12 @@ checkDNS

		type: ``boolean`` default: ``false``

		.. versionadded:: 4.1
		This option was deprecated in Symfony 4.1 and will be removed in Symfony 5.0,
		because checking the DNS records is not reliable enough to validate the
		existence of the host. Use the :phpfunction:`checkdnsrr` PHP function if you
		still want to use this kind of validation.

		By default, this constraint just validates the syntax of the given URL. If you
		also need to check whether the associated host exists, set the ``checkDNS``
		option to ``true``:
Expand DownExpand Up		@@ -305,6 +311,12 @@ dnsMessage

		type: ``string`` default: ``The host could not be resolved.``

		.. versionadded:: 4.1
		This option was deprecated in Symfony 4.1 and will be removed in Symfony 5.0,
		because checking the DNS records is not reliable enough to validate the
		existence of the host. Use the :phpfunction:`checkdnsrr` PHP function if you
		still want to use this kind of validation.

		This message is shown when the ``checkDNS`` option is set to ``true`` and the
		DNS check failed.

Expand Down