Traditional load testing has always involved simulating user traffic by replaying a series of HTTP requests. This traffic is designed to appear just like a the traffic a real user would cause and is considered a virtual user.
However, achieving realistic traffic can sometimes be very tricky, especially with new technologies like AJAX and things like .NET’s view state. The upside of this approach is that it requires a fraction of the hardware that would be required to run real browsers. For this reason, load testing tools have opted to simulate HTTP traffic for years.
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