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Merge branch '6.4' into 7.2
* 6.4: Minor tweaks [WebLink] make use of avilable constant
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web_link.rst

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@@ -195,6 +195,12 @@ You can also add links to the HTTP response directly from controllers and servic
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.. tip::
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The possible values of link relations (``'preload'``, ``'preconnect'``, etc.)
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are also defined as constants in the :class:`Symfony\\Component\\WebLink\\Link`
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class (e.g. ``Link::REL_PRELOAD``, ``Link::REL_PRECONNECT``, etc.).
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.. _`WebLink`: https://github.com/symfony/web-link
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.. _`HTTP/2 Server Push`: https://tools.ietf.org/html/rfc7540#section-8.2
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.. _`Resource Hints`: https://www.w3.org/TR/resource-hints/

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