A PHP HTTP client for fetching content from remote urls. \Drupal::httpClient() Default http client in Drupal (It's guzzle under the hood). Topics Module Development Resources Guzzle Documentation Course: Module Development Module Development Hooks Navigating Code Drupal Bootstrap Process Plugins OOP in Drupal XDebug Debugging techniques Caching Drupal Services Guzzle Custom Module Dependencies Drupal Core Utilities and Includes