function PageCacheTest::testConditionalRequests

Tests support of requests with If-Modified-Since and If-None-Match headers.

File

core/modules/page_cache/tests/src/Functional/PageCacheTest.php, line 161

Class

PageCacheTest

Enables the page cache and tests it with various HTTP requests.

Namespace

Code

public function testConditionalRequests() : void {
  $this->enablePageCaching();
  // Fill the cache.
  $this->drupalGet('');
  // Verify the page is not printed twice when the cache is cold.
  $this->assertSession()
    ->responseNotMatches('#<html.*<html#');
  $this->drupalGet('');
  $this->assertSession()
    ->responseHeaderEquals('X-Drupal-Cache', 'HIT');
  $etag = $this->getSession()
    ->getResponseHeader('ETag');
  $last_modified = $this->getSession()
    ->getResponseHeader('Last-Modified');
  // Ensure a conditional request returns 304 Not Modified.
  $this->drupalGet('', [], [
    'If-Modified-Since' => $last_modified,
    'If-None-Match' => $etag,
  ]);
  $this->assertSession()
    ->statusCodeEquals(304);
  // Ensure a conditional request with obsolete If-Modified-Since date
  // returns 304 Not Modified.
  $this->drupalGet('', [], [
    'If-Modified-Since' => gmdate(DATE_RFC822, strtotime($last_modified)),
    'If-None-Match' => $etag,
  ]);
  $this->assertSession()
    ->statusCodeEquals(304);
  // Ensure a conditional request with obsolete If-Modified-Since date
  // returns 304 Not Modified.
  $this->drupalGet('', [], [
    'If-Modified-Since' => gmdate(DATE_RFC850, strtotime($last_modified)),
    'If-None-Match' => $etag,
  ]);
  $this->assertSession()
    ->statusCodeEquals(304);
  // Ensure a conditional request without If-None-Match returns 200 OK.
  $this->drupalGet('', [], [
    'If-Modified-Since' => $last_modified,
    'If-None-Match' => '',
  ]);
  // Verify the page is not printed twice when the cache is warm.
  $this->assertSession()
    ->responseNotMatches('#<html.*<html#');
  $this->assertSession()
    ->statusCodeEquals(200);
  $this->assertSession()
    ->responseHeaderEquals('X-Drupal-Cache', 'HIT');
  // Ensure a conditional request with If-Modified-Since newer than
  // Last-Modified returns 200 OK.
  $this->drupalGet('', [], [
    'If-Modified-Since' => gmdate(DateTimePlus::RFC7231, strtotime($last_modified) + 1),
    'If-None-Match' => $etag,
  ]);
  $this->assertSession()
    ->statusCodeEquals(200);
  $this->assertSession()
    ->responseHeaderEquals('X-Drupal-Cache', 'HIT');
  // Ensure a conditional request by an authenticated user returns 200 OK.
  $user = $this->drupalCreateUser();
  $this->drupalLogin($user);
  $this->drupalGet('', [], [
    'If-Modified-Since' => $last_modified,
    'If-None-Match' => $etag,
  ]);
  $this->assertSession()
    ->statusCodeEquals(200);
  // Verify that absence of Page was not cached.
  $this->assertSession()
    ->responseHeaderDoesNotExist('X-Drupal-Cache');
  $this->drupalLogout();
}