function HttpResponseDebugCacheabilityHeadersTest::testCacheDebugHeadersLineLength

Tests that cache debug headers do not error from exceeding line limits.

File

core/tests/Drupal/KernelTests/Core/EventSubscriber/HttpResponseDebugCacheabilityHeadersTest.php, line 35

Class

HttpResponseDebugCacheabilityHeadersTest

Tests that debug cacheability header lines do not exceed Apache limit.

Namespace

Code

public function testCacheDebugHeadersLineLength() : void {
  $assertSession = $this->assertSession();
  $this->drupalGet('test-cache-contexts-headers');
  $assertSession->statusCodeEquals(200);
  $assertSession->addressEquals('test-cache-contexts-headers');
  $headers = $this->getSession()
    ->getResponseHeaders();
  $this->assertArrayHasKey('x-drupal-cache-contexts', $headers);
  $context_lines = (array) $headers['x-drupal-cache-contexts'];
  // The payload is engineered to exceed the Apache line limit, so the header
  // must have been split across multiple lines, and each individual line must
  // stay under the 8190-byte limit that would otherwise trigger a 500.
  $this->assertGreaterThan(1, count($context_lines));
  foreach ($context_lines as $line) {
    $this->assertLessThanOrEqual(8190, strlen($line));
  }
  // Merge multiple cache contexts headers together if needed.
  $contexts = implode(' ', $context_lines);
  $this->assertStringContainsString('url.query_args:0000', $contexts);
  $this->assertStringContainsString('url.query_args:0699', $contexts);
  $this->drupalGet('test-cache-tags-headers');
  $assertSession->statusCodeEquals(200);
  $assertSession->addressEquals('test-cache-tags-headers');
  $headers = $this->getSession()
    ->getResponseHeaders();
  $this->assertArrayHasKey('x-drupal-cache-tags', $headers);
  $tag_lines = (array) $headers['x-drupal-cache-tags'];
  $this->assertGreaterThan(1, count($tag_lines));
  foreach ($tag_lines as $line) {
    $this->assertLessThanOrEqual(8190, strlen($line));
  }
  // Merge multiple cache tags headers together if needed.
  $tags = implode(' ', $tag_lines);
  $this->assertStringContainsString('cache-tag:00000', $tags);
  $this->assertStringContainsString('cache-tag:00799', $tags);
}