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<?php
namespace Drupal\page_cache\Tests;
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use Drupal\Component\Datetime\DateTimePlus;
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use Drupal\Core\Site\Settings;
use Drupal\Core\Url;
use Drupal\entity_test\Entity\EntityTest;
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use Drupal\simpletest\WebTestBase;
use Drupal\Core\Cache\Cache;
use Drupal\user\RoleInterface;
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/**
* Enables the page cache and tests it with various HTTP requests.
* @group page_cache
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*/
class PageCacheTest extends WebTestBase {
protected $dumpHeaders = TRUE;
/**
* Modules to enable.
*
* @var array
*/
public static $modules = ['test_page_test', 'system_test', 'entity_test'];
/**
* {@inheritdoc}
*/
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protected function setUp() {
parent::setUp();
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$this->config('system.site')
->set('name', 'Drupal')
->set('page.front', '/test-page')
->save();
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}
/**
* Test that cache tags are properly persisted.
*
* Since tag based invalidation works, we know that our tag properly
* persisted.
*/
public function testPageCacheTags() {
$config = $this->config('system.performance');
$config->set('cache.page.max_age', 300);
$config->save();
$path = 'system-test/cache_tags_page';
$tags = ['system_test_cache_tags_page'];
$this->drupalGet($path);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS');
// Verify a cache hit, but also the presence of the correct cache tags.
$this->drupalGet($path);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'HIT');
$cid_parts = [\Drupal::url('system_test.cache_tags_page', [], ['absolute' => TRUE]), 'html'];
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$cid = implode(':', $cid_parts);
$cache_entry = \Drupal::cache('render')->get($cid);
sort($cache_entry->tags);
$expected_tags = [
'config:user.role.anonymous',
'http_response',
'pre_render',
'rendered',
'system_test_cache_tags_page',
];
$this->assertIdentical($cache_entry->tags, $expected_tags);
Cache::invalidateTags($tags);
$this->drupalGet($path);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS');
}
/**
* Test that the page cache doesn't depend on cacheability headers.
*/
public function testPageCacheTagsIndependentFromCacheabilityHeaders() {
$this->setHttpResponseDebugCacheabilityHeaders(FALSE);
$path = 'system-test/cache_tags_page';
$tags = ['system_test_cache_tags_page'];
$this->drupalGet($path);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS');
// Verify a cache hit, but also the presence of the correct cache tags.
$this->drupalGet($path);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'HIT');
$cid_parts = [\Drupal::url('system_test.cache_tags_page', [], ['absolute' => TRUE]), 'html'];
$cid = implode(':', $cid_parts);
$cache_entry = \Drupal::cache('render')->get($cid);
sort($cache_entry->tags);
$expected_tags = [
'config:user.role.anonymous',
'http_response',
'pre_render',
'rendered',
'system_test_cache_tags_page',
];
$this->assertIdentical($cache_entry->tags, $expected_tags);
Cache::invalidateTags($tags);
$this->drupalGet($path);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS');
}
/**
* Tests support for different cache items with different request formats
* specified via a query parameter.
*/
public function testQueryParameterFormatRequests() {
$config = $this->config('system.performance');
$config->set('cache.page.max_age', 300);
$config->save();
$accept_header_cache_url = Url::fromRoute('system_test.page_cache_accept_header');
$accept_header_cache_url_with_json = Url::fromRoute('system_test.page_cache_accept_header', ['_format' => 'json']);
$this->drupalGet($accept_header_cache_url);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS', 'HTML page was not yet cached.');
$this->drupalGet($accept_header_cache_url);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'HIT', 'HTML page was cached.');
$this->assertRaw('<p>oh hai this is html.</p>', 'The correct HTML response was returned.');
$this->drupalGet($accept_header_cache_url_with_json);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS', 'Json response was not yet cached.');
$this->drupalGet($accept_header_cache_url_with_json);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'HIT', 'Json response was cached.');
$this->assertRaw('{"content":"oh hai this is json"}', 'The correct Json response was returned.');
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// Enable REST support for nodes and hal+json.
\Drupal::service('module_installer')->install(['node', 'rest', 'hal', 'basic_auth']);
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$this->drupalCreateContentType(['type' => 'article']);
$node = $this->drupalCreateNode(['type' => 'article']);
$node_uri = $node->urlInfo();
$node_url_with_hal_json_format = $node->urlInfo('canonical')->setRouteParameter('_format', 'hal_json');
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$this->drupalGet($node_uri);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS');
$this->assertEqual($this->drupalGetHeader('Content-Type'), 'text/html; charset=UTF-8');
$this->drupalGet($node_uri);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'HIT');
$this->assertEqual($this->drupalGetHeader('Content-Type'), 'text/html; charset=UTF-8');
// Now request a HAL page, we expect that the first request is a cache miss
// and it serves HTML.
$this->drupalGet($node_url_with_hal_json_format);
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$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS');
$this->assertEqual($this->drupalGetHeader('Content-Type'), 'application/hal+json');
$this->drupalGet($node_url_with_hal_json_format);
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$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'HIT');
$this->assertEqual($this->drupalGetHeader('Content-Type'), 'application/hal+json');
// Clear the page cache. After that request a HAL request, followed by an
// ordinary HTML one.
\Drupal::cache('render')->deleteAll();
$this->drupalGet($node_url_with_hal_json_format);
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$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS');
$this->assertEqual($this->drupalGetHeader('Content-Type'), 'application/hal+json');
$this->drupalGet($node_url_with_hal_json_format);
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$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'HIT');
$this->assertEqual($this->drupalGetHeader('Content-Type'), 'application/hal+json');
$this->drupalGet($node_uri);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS');
$this->assertEqual($this->drupalGetHeader('Content-Type'), 'text/html; charset=UTF-8');
$this->drupalGet($node_uri);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'HIT');
$this->assertEqual($this->drupalGetHeader('Content-Type'), 'text/html; charset=UTF-8');
}
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/**
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* Tests support of requests with If-Modified-Since and If-None-Match headers.
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*/
public function testConditionalRequests() {
$config = $this->config('system.performance');
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$config->set('cache.page.max_age', 300);
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$config->save();
// Fill the cache.
$this->drupalGet('');
// Verify the page is not printed twice when the cache is cold.
$this->assertNoPattern('#<html.*<html#');
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$this->drupalHead('');
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$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'HIT', 'Page was cached.');
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$etag = $this->drupalGetHeader('ETag');
$last_modified = $this->drupalGetHeader('Last-Modified');
$this->drupalGet('', [], ['If-Modified-Since: ' . $last_modified, 'If-None-Match: ' . $etag]);
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$this->assertResponse(304, 'Conditional request returned 304 Not Modified.');
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$this->drupalGet('', [], ['If-Modified-Since: ' . gmdate(DATE_RFC822, strtotime($last_modified)), 'If-None-Match: ' . $etag]);
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$this->assertResponse(304, 'Conditional request with obsolete If-Modified-Since date returned 304 Not Modified.');
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$this->drupalGet('', [], ['If-Modified-Since: ' . gmdate(DATE_RFC850, strtotime($last_modified)), 'If-None-Match: ' . $etag]);
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$this->assertResponse(304, 'Conditional request with obsolete If-Modified-Since date returned 304 Not Modified.');
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$this->drupalGet('', [], ['If-Modified-Since: ' . $last_modified]);
// Verify the page is not printed twice when the cache is warm.
$this->assertNoPattern('#<html.*<html#');
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$this->assertResponse(200, 'Conditional request without If-None-Match returned 200 OK.');
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'HIT', 'Page was cached.');
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$this->drupalGet('', [], ['If-Modified-Since: ' . gmdate(DateTimePlus::RFC7231, strtotime($last_modified) + 1), 'If-None-Match: ' . $etag]);
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$this->assertResponse(200, 'Conditional request with new a If-Modified-Since date newer than Last-Modified returned 200 OK.');
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'HIT', 'Page was cached.');
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$user = $this->drupalCreateUser();
$this->drupalLogin($user);
$this->drupalGet('', [], ['If-Modified-Since: ' . $last_modified, 'If-None-Match: ' . $etag]);
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$this->assertResponse(200, 'Conditional request returned 200 OK for authenticated user.');
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$this->assertFalse($this->drupalGetHeader('X-Drupal-Cache'), 'Absence of Page was not cached.');
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}
/**
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* Tests cache headers.
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*/
public function testPageCache() {
$config = $this->config('system.performance');
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$config->set('cache.page.max_age', 300);
$config->set('response.gzip', 1);
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$config->save();
// Fill the cache.
$this->drupalGet('system-test/set-header', ['query' => ['name' => 'Foo', 'value' => 'bar']]);
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$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS', 'Page was not cached.');
$this->assertEqual(strtolower($this->drupalGetHeader('Vary')), 'cookie,accept-encoding', 'Vary header was sent.');
// Symfony's Response logic determines a specific order for the subvalues
// of the Cache-Control header, even if they are explicitly passed in to
// the response header bag in a different order.
$this->assertEqual($this->drupalGetHeader('Cache-Control'), 'max-age=300, public', 'Cache-Control header was sent.');
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$this->assertEqual($this->drupalGetHeader('Expires'), 'Sun, 19 Nov 1978 05:00:00 GMT', 'Expires header was sent.');
$this->assertEqual($this->drupalGetHeader('Foo'), 'bar', 'Custom header was sent.');
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// Check cache.
$this->drupalGet('system-test/set-header', ['query' => ['name' => 'Foo', 'value' => 'bar']]);
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$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'HIT', 'Page was cached.');
$this->assertEqual(strtolower($this->drupalGetHeader('Vary')), 'cookie,accept-encoding', 'Vary: Cookie header was sent.');
$this->assertEqual($this->drupalGetHeader('Cache-Control'), 'max-age=300, public', 'Cache-Control header was sent.');
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$this->assertEqual($this->drupalGetHeader('Expires'), 'Sun, 19 Nov 1978 05:00:00 GMT', 'Expires header was sent.');
$this->assertEqual($this->drupalGetHeader('Foo'), 'bar', 'Custom header was sent.');
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// Check replacing default headers.
$this->drupalGet('system-test/set-header', ['query' => ['name' => 'Expires', 'value' => 'Fri, 19 Nov 2008 05:00:00 GMT']]);
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$this->assertEqual($this->drupalGetHeader('Expires'), 'Fri, 19 Nov 2008 05:00:00 GMT', 'Default header was replaced.');
$this->drupalGet('system-test/set-header', ['query' => ['name' => 'Vary', 'value' => 'User-Agent']]);
$this->assertEqual(strtolower($this->drupalGetHeader('Vary')), 'user-agent,accept-encoding', 'Default header was replaced.');
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// Check that authenticated users bypass the cache.
$user = $this->drupalCreateUser();
$this->drupalLogin($user);
$this->drupalGet('system-test/set-header', ['query' => ['name' => 'Foo', 'value' => 'bar']]);
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$this->assertFalse($this->drupalGetHeader('X-Drupal-Cache'), 'Caching was bypassed.');
$this->assertTrue(strpos(strtolower($this->drupalGetHeader('Vary')), 'cookie') === FALSE, 'Vary: Cookie header was not sent.');
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$this->assertEqual($this->drupalGetHeader('Cache-Control'), 'must-revalidate, no-cache, private', 'Cache-Control header was sent.');
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$this->assertEqual($this->drupalGetHeader('Expires'), 'Sun, 19 Nov 1978 05:00:00 GMT', 'Expires header was sent.');
$this->assertEqual($this->drupalGetHeader('Foo'), 'bar', 'Custom header was sent.');
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// Until bubbling of max-age up to the response is supported, verify that
// a custom #cache max-age set on an element does not affect page max-age.
$this->drupalLogout();
$this->drupalGet('system-test/cache_maxage_page');
$this->assertEqual($this->drupalGetHeader('Cache-Control'), 'max-age=300, public');
}
/**
* Tests the automatic presence of the anonymous role's cache tag.
*
* The 'user.permissions' cache context ensures that if the permissions for a
* role are modified, users are not served stale render cache content. But,
* when entire responses are cached in reverse proxies, the value for the
* cache context is never calculated, causing the stale response to not be
* invalidated. Therefore, when varying by permissions and the current user is
* the anonymous user, the cache tag for the 'anonymous' role must be added.
*
* This test verifies that, and it verifies that it does not happen for other
* roles.
*/
public function testPageCacheAnonymousRolePermissions() {
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$config = $this->config('system.performance');
$config->set('cache.page.max_age', 300);
$config->save();
$content_url = Url::fromRoute('system_test.permission_dependent_content');
$route_access_url = Url::fromRoute('system_test.permission_dependent_route_access');
// 1. anonymous user, without permission.
$this->drupalGet($content_url);
$this->assertText('Permission to pet llamas: no!');
$this->assertCacheContext('user.permissions');
$this->assertCacheTag('config:user.role.anonymous');
$this->drupalGet($route_access_url);
$this->assertCacheContext('user.permissions');
$this->assertCacheTag('config:user.role.anonymous');
// 2. anonymous user, with permission.
user_role_grant_permissions(RoleInterface::ANONYMOUS_ID, ['pet llamas']);
$this->drupalGet($content_url);
$this->assertText('Permission to pet llamas: yes!');
$this->assertCacheContext('user.permissions');
$this->assertCacheTag('config:user.role.anonymous');
$this->drupalGet($route_access_url);
$this->assertCacheContext('user.permissions');
$this->assertCacheTag('config:user.role.anonymous');
// 3. authenticated user, without permission.
$auth_user = $this->drupalCreateUser();
$this->drupalLogin($auth_user);
$this->drupalGet($content_url);
$this->assertText('Permission to pet llamas: no!');
$this->assertCacheContext('user.permissions');
$this->assertNoCacheTag('config:user.role.authenticated');
$this->drupalGet($route_access_url);
$this->assertCacheContext('user.permissions');
$this->assertNoCacheTag('config:user.role.authenticated');
// 4. authenticated user, with permission.
user_role_grant_permissions(RoleInterface::AUTHENTICATED_ID, ['pet llamas']);
$this->drupalGet($content_url);
$this->assertText('Permission to pet llamas: yes!');
$this->assertCacheContext('user.permissions');
$this->assertNoCacheTag('config:user.role.authenticated');
$this->drupalGet($route_access_url);
$this->assertCacheContext('user.permissions');
$this->assertNoCacheTag('config:user.role.authenticated');
}
/**
* Tests the 4xx-response cache tag is added and invalidated.
*/
public function testPageCacheAnonymous403404() {
$admin_url = Url::fromRoute('system.admin');
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$invalid_url = 'foo/does_not_exist';
$tests = [
403 => $admin_url,
404 => $invalid_url,
];
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$cache_ttl_4xx = Settings::get('cache_ttl_4xx', 3600);
foreach ($tests as $code => $content_url) {
// Anonymous user, without permissions.
$this->drupalGet($content_url);
$this->assertResponse($code);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS');
$this->assertCacheTag('4xx-response');
$this->drupalGet($content_url);
$this->assertResponse($code);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'HIT');
$entity_values = [
'name' => $this->randomMachineName(),
'user_id' => 1,
'field_test_text' => [
0 => [
'value' => $this->randomString(),
'format' => 'plain_text',
]
],
];
$entity = EntityTest::create($entity_values);
$entity->save();
// Saving an entity clears 4xx cache tag.
$this->drupalGet($content_url);
$this->assertResponse($code);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS');
$this->drupalGet($content_url);
$this->assertResponse($code);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'HIT');
// Rebuilding the router should invalidate the 4xx cache tag.
$this->container->get('router.builder')->rebuild();
$this->drupalGet($content_url);
$this->assertResponse($code);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS');
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// Ensure the 'expire' field on the cache entry uses cache_ttl_4xx.
$cache_item = \Drupal::service('cache.render')->get($this->getUrl() . ':html');
$difference = $cache_item->expire - (int) $cache_item->created;
// Given that a second might have passed we cannot be sure that
// $difference will exactly equal the default cache_ttl_4xx setting.
// Account for any timing difference or rounding errors by ensuring the
// value is within 10 seconds.
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$this->assertTrue(
$difference > $cache_ttl_4xx - 10 &&
$difference < $cache_ttl_4xx + 10,
"The cache entry expiry time uses the cache_ttl_4xx setting. Expire: {$cache_item->expire} Created: {$cache_item->created}"
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);
}
// Disable 403 and 404 caching.
$settings['settings']['cache_ttl_4xx'] = (object) [
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'value' => 0,
'required' => TRUE,
];
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$this->writeSettings($settings);
\Drupal::service('cache.render')->deleteAll();
foreach ($tests as $code => $content_url) {
// Getting the 404 page twice should still result in a cache miss.
$this->drupalGet($content_url);
$this->drupalGet($content_url);
$this->assertResponse($code);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS');
}
}
/**
* Tests the omit_vary_cookie setting.
*/
public function testPageCacheWithoutVaryCookie() {
$config = $this->config('system.performance');
$config->set('cache.page.max_age', 300);
$config->save();
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$settings['settings']['omit_vary_cookie'] = (object) [
'value' => TRUE,
'required' => TRUE,
];
$this->writeSettings($settings);
// Fill the cache.
$this->drupalGet('');
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS', 'Page was not cached.');
$this->assertTrue(strpos($this->drupalGetHeader('Vary'), 'Cookie') === FALSE, 'Vary: Cookie header was not sent.');
$this->assertEqual($this->drupalGetHeader('Cache-Control'), 'max-age=300, public', 'Cache-Control header was sent.');
// Check cache.
$this->drupalGet('');
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'HIT', 'Page was cached.');
$this->assertTrue(strpos($this->drupalGetHeader('Vary'), 'Cookie') === FALSE, 'Vary: Cookie header was not sent.');
$this->assertEqual($this->drupalGetHeader('Cache-Control'), 'max-age=300, public', 'Cache-Control header was sent.');
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}
/**
* Test the setting of forms to be immutable.
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*/
public function testFormImmutability() {
// Install the module that provides the test form.
$this->container->get('module_installer')
->install(['page_cache_form_test']);
// Uninstall the page_cache module to verify that form is immutable
// regardless of the internal page cache module.
$this->container->get('module_installer')->uninstall(['page_cache']);
\Drupal::service('router.builder')->rebuild();
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$this->drupalGet('page_cache_form_test_immutability');
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$this->assertText("Immutable: TRUE", "Form is immutable.");
// The immutable flag is set unconditionally by system_form_alter(), set
// a flag to tell page_cache_form_test_module_implements_alter() to disable
// that implementation.
\Drupal::state()->set('page_cache_bypass_form_immutability', TRUE);
\Drupal::moduleHandler()->resetImplementations();
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Cache::invalidateTags(['rendered']);
$this->drupalGet('page_cache_form_test_immutability');
$this->assertText("Immutable: FALSE", "Form is not immutable,");
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}
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/**
* Tests cacheability of a CacheableResponse.
*
* Tests the difference between having a controller return a plain Symfony
* Response object versus returning a Response object that implements the
* CacheableResponseInterface.
*/
public function testCacheableResponseResponses() {
$config = $this->config('system.performance');
$config->set('cache.page.max_age', 300);
$config->save();
// GET a URL, which would be marked as a cache miss if it were cacheable.
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$this->drupalGet('/system-test/respond-reponse');
$this->assertFalse($this->drupalGetHeader('X-Drupal-Cache'), 'Drupal page cache header not found.');
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$this->assertEqual($this->drupalGetHeader('Cache-Control'), 'must-revalidate, no-cache, private', 'Cache-Control header was sent');
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// GET it again, verify it's still not cached.
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$this->drupalGet('/system-test/respond-reponse');
$this->assertFalse($this->drupalGetHeader('X-Drupal-Cache'), 'Drupal page cache header not found.');
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$this->assertEqual($this->drupalGetHeader('Cache-Control'), 'must-revalidate, no-cache, private', 'Cache-Control header was sent');
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// GET a URL, which would be marked as a cache miss if it were cacheable.
$this->drupalGet('/system-test/respond-public-response');
$this->assertFalse($this->drupalGetHeader('X-Drupal-Cache'), 'Drupal page cache header not found.');
$this->assertEqual($this->drupalGetHeader('Cache-Control'), 'max-age=60, public', 'Cache-Control header was sent');
// GET it again, verify it's still not cached.
$this->drupalGet('/system-test/respond-public-response');
$this->assertFalse($this->drupalGetHeader('X-Drupal-Cache'), 'Drupal page cache header not found.');
$this->assertEqual($this->drupalGetHeader('Cache-Control'), 'max-age=60, public', 'Cache-Control header was sent');
// GET a URL, which should be marked as a cache miss.
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$this->drupalGet('/system-test/respond-cacheable-reponse');
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS', 'Page was not cached.');
$this->assertEqual($this->drupalGetHeader('Cache-Control'), 'max-age=300, public', 'Cache-Control header was sent.');
// GET it again, it should now be a cache hit.
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$this->drupalGet('/system-test/respond-cacheable-reponse');
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'HIT', 'Page was cached.');
$this->assertEqual($this->drupalGetHeader('Cache-Control'), 'max-age=300, public', 'Cache-Control header was sent.');
// Uninstall page cache. This should flush all caches so the next call to a
// previously cached page should be a miss now.
$this->container->get('module_installer')
->uninstall(['page_cache']);
// GET a URL that was cached by Page Cache before, it should not be now.
$this->drupalGet('/respond-cacheable-reponse');
$this->assertFalse($this->drupalGetHeader('X-Drupal-Cache'), 'Drupal page cache header not found.');
Alex Bronstein
committed
}
Alex Pott
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/**
* Tests that HEAD requests are treated the same as GET requests.
*/
public function testHead() {
// GET, then HEAD.
$url_a = $this->buildUrl('system-test/set-header', ['query' => ['name' => 'Foo', 'value' => 'bar']]);
$response_body = $this->curlExec([CURLOPT_HTTPGET => TRUE, CURLOPT_URL => $url_a, CURLOPT_CUSTOMREQUEST => 'GET', CURLOPT_NOBODY => FALSE]);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS', 'Page was not cached.');
$this->assertEqual($this->drupalGetHeader('Foo'), 'bar', 'Custom header was sent.');
$this->assertEqual('The following header was set: <em class="placeholder">Foo</em>: <em class="placeholder">bar</em>', $response_body);
$response_body = $this->curlExec([CURLOPT_HTTPGET => FALSE, CURLOPT_URL => $url_a, CURLOPT_CUSTOMREQUEST => 'HEAD', CURLOPT_NOBODY => FALSE]);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'HIT', 'Page was cached.');
$this->assertEqual($this->drupalGetHeader('Foo'), 'bar', 'Custom header was sent.');
$this->assertEqual('', $response_body);
// HEAD, then GET.
$url_b = $this->buildUrl('system-test/set-header', ['query' => ['name' => 'Foo', 'value' => 'baz']]);
$response_body = $this->curlExec([CURLOPT_HTTPGET => FALSE, CURLOPT_URL => $url_b, CURLOPT_CUSTOMREQUEST => 'HEAD', CURLOPT_NOBODY => FALSE]);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS', 'Page was not cached.');
$this->assertEqual($this->drupalGetHeader('Foo'), 'baz', 'Custom header was sent.');
$this->assertEqual('', $response_body);
$response_body = $this->curlExec([CURLOPT_HTTPGET => TRUE, CURLOPT_URL => $url_b, CURLOPT_CUSTOMREQUEST => 'GET', CURLOPT_NOBODY => FALSE]);
$this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'HIT', 'Page was cached.');
$this->assertEqual($this->drupalGetHeader('Foo'), 'baz', 'Custom header was sent.');
$this->assertEqual('The following header was set: <em class="placeholder">Foo</em>: <em class="placeholder">baz</em>', $response_body);
}