# Replaying Traffic

When developing and testing web applications, it is common to wonder how your server and site will handle many continuous requests. You may also want to test if a specific functionality of your web application will respond correctly to multiple repeating requests. With Fiddler Everywhere, you can replay a session or multiple sessions and set specific repeating conditions such as the number of repeats, repeat behavior, and request behavior for each separate repeat.

## One-Time Replay

To trigger a one-time replay for selected sessions, follow these steps:

1. Select one or more sessions.
2. Invoke the context menu or press `R`.

As a result, the selected sessions will be immediately replayed and displayed as new entries in the Fiddler traffic grid.

![One-time replay for sessions](https://www.telerik.com/fiddler/fiddler-everywhere/documentation/assets/763162187fb04269838d7fd553a60803/replay-simple.png)

## Advanced Replay

For more advanced replay options, follow these steps:

1. Select one or more sessions.
2. Invoke the context menu or press `Alt`+`R`/`Option`+`R`.

The above opens the **Advanced Replay** configuration prompt window, allowing you to control the following aspects of the replay process:

* **Number of Repeats**: Configure how many times the selected session must be replayed. The maximum is 100000 iterations.
* **Repeat Behavior**: Set whether the repeats for each selected session must be triggered sequentially (one after the other) or in parallel (in a batch).
  * **Sequential**: each repeat will start after the previous one has finished.
  * **Parallel**: all repeats will start at the same time.
* **Request Behavior**: Set whether the requests from multiple selected sessions in each repeat must be triggered sequentially (one after the other) or in parallel (in a batch). This option is available only when multiple different sessions are selected.
  * **Sequential**: each request in the series of repeats will start after the previous one has finished.
  * **Parallel**: all requests will start simultaneously in the repeats.

![Advanced Replay configuration](https://www.telerik.com/fiddler/fiddler-everywhere/documentation/assets/5087e10b4572da4d0a4440a4e2962c89/replay-advanced.png)

All replay options are available for live traffic and traffic loaded from saved snapshots (for example, saved session's snapshots loaded from the **Snapshots** list or from imported SAZ files).