Dynatrace Pro Certification Practice Exam

When does an XHR action begin and end according to Dynatrace?

1. Starts on page load and ends when the user navigates away

2. Starts with a user click and ends when all subsequent requests receive responses

3. Starts with the first byte received and ends on session timeout

4. Starts with a form submission and ends with the page load

The correct answer is: Starts with a user click and ends when all subsequent requests receive responses

The correct response identifies that an XHR (XMLHttpRequest) action begins with a user click and ends when all subsequent requests receive their responses. This aligns with how XHR actions function within web applications, particularly around user interactions that trigger data retrieval without requiring a full page reload. In a web context, when a user interacts with the application—such as clicking a button that sends an XHR request—the action is logged as the start of the XHR activity. After the initial user-initiated request, the tracking continues until all related asynchronous requests (that may have been triggered by that initial click) have completed and responded, ensuring that all data required for the user's interaction has been fully received. This comprehensive tracking allows for detailed performance metrics related to how quickly and efficiently an application responds to user actions. In contrast, the other options do not accurately represent the lifecycle of an XHR action as understood by Dynatrace. They suggest various trigger points and endpoints that do not encompass the full scope of how XHR interactions are measured in terms of user experience and performance tracking. Thus, understanding the approved start and end points is critical for accurate performance analysis.