Logging

Register Fetch\Middleware\LoggingMiddleware with a PSR-3 logger to log request activity:

use Fetch\Middleware\LoggingMiddleware;

$handler = fetch_client()->getHandler();
$handler->addMiddleware(new LoggingMiddleware($logger));

Logging middleware participates in the middleware pipeline. It does not make request execution asynchronous. Review the logger configuration and any custom middleware for redaction of authorization headers, cookies, credentials, request/response bodies, and sensitive query parameters. Never log secret-bearing values from example applications.