Avoid empty \"If-Modified-Since\" header in validation request
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@ -352,7 +352,9 @@ class HttpCache implements HttpKernelInterface, TerminableInterface
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}
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// add our cached last-modified validator
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if ($entry->headers->has('Last-Modified')) {
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$subRequest->headers->set('if_modified_since', $entry->headers->get('Last-Modified'));
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}
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// Add our cached etag validator to the environment.
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// We keep the etags from the client to handle the case when the client
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@ -859,6 +859,7 @@ class HttpCacheTest extends HttpCacheTestCase
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public function testValidatesCachedResponsesWithETagAndNoFreshnessInformation()
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{
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$this->setNextResponse(200, [], 'Hello World', function ($request, $response) {
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$this->assertFalse($request->headers->has('If-Modified-Since'));
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$response->headers->set('Cache-Control', 'public');
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$response->headers->set('ETag', '"12345"');
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if ($response->getETag() == $request->headers->get('IF_NONE_MATCH')) {
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