Which of the following is NOT a tool for making HTTP requests?

The answer identifies a tool that does not facilitate making HTTP requests. HTTPie, Simple JSON Server, and Browser Dev Tools each play a role in handling or initiating HTTP requests.

HTTPie is a command-line HTTP client designed for making requests easier for developers. Its user-friendly syntax allows for sending HTTP requests with a straightforward command structure, making it a popular choice for testing APIs.

Simple JSON Server acts as a mock REST API, allowing users to simulate server interactions by creating fake endpoints that respond with JSON. This tool supports making GET, POST, PUT, and DELETE requests, demonstrating its core purpose of mimicking HTTP behaviors.

Browser Dev Tools provide built-in utilities in modern web browsers. These tools include a network tab, which allows developers to inspect HTTP requests sent by the web application, analyze responses, and debug issues related to network activities.

In contrast, an XML Parser is designed to read and manipulate XML data but does not inherently create or process HTTP requests. It focuses on interpreting the structured data contained in XML files rather than interacting with web services or APIs through HTTP. This distinction clarifies why it's the correct answer as it is not a tool for making HTTP requests.