There are a few things that a JMeter developer can do to test a web application: - Use the HTTP Request sampler to send requests to the web server and measure the response time. - Use the Throughput Controller to limit the number of simultaneous requests. This will help simulate different load levels on the server. - Use the Transaction Controller to measure the overall performance of the application under test. This includes measuring response times for individual transactions (such as login, search, add to cart, etc.)