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Commit58b7f96

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minorsymfony#3596 [HTTP Cache] Validation model: Fix header name (bicpi)
This PR was merged into the 2.3 branch.Discussion----------[HTTP Cache] Validation model: Fix header name| Q | A| ------------- | ---| Doc fix? | yes| New docs? | no| Applies to | all| Fixed tickets | -In the cache validation model, the response sends an `ETag` header, but the following requests send an `If-None-Match` header. So the `If-None-Match` header from the request is compared to the `ETag` from the previous response. See `Symfony\Component\HttpFoundation\Request::getETags()` which is used by `Symfony\Component\HttpFoundation\Response::isNotModified()`.Commits-------f7ef7c0 [HTTP Cache] Validation model: Fix header name
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‎book/http_cache.rst

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@@ -572,9 +572,16 @@ To see a simple implementation, generate the ETag as the md5 of the content::
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}
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The:method:`Symfony\\Component\\HttpFoundation\\Response::isNotModified`
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method compares the ``ETag`` sent with the ``Request`` with the one set
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on the ``Response``. If the two match, the method automatically sets the
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``Response`` status code to 304.
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method compares the ``If-None-Match`` sent with the ``Request`` with the
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``ETag`` header set on the ``Response``. If the two match, the method
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automatically sets the ``Response`` status code to 304.
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..note::
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The ``If-None-Match`` request header equals the ``ETag`` header of the
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last response sent to the client for the particular resource. This is
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how the client and server communicate with each other and decide whether
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or not the resource has been updated since it was cached.
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This algorithm is simple enough and very generic, but you need to create the
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whole ``Response`` before being able to compute the ETag, which is sub-optimal.

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