Browser Tracer


The Browser Tracer is available from the Tools menu in Design Studio. The Browser Tracer can trace HTTP traffic in Design Studio as well as JavaScript execution for robots written with the Classic browser that was default in pre-9.3 robots. It is useful for performance tuning robots and figuring out workarounds for sites that do not work out-of-the-box.


To start tracing, enable the Record button. While recording - especially if using JavaScript recording - things may run much slower than normal since vast amounts of data is collected. Thus, you should make sure to disable the Record button once you have traced what you wanted.

HTTP Trace

The HTTP trace shows HTTP traffic. Selecting a trace entry shows the details about that HTTP event in the detail view below the trace. The detail view shows the request and response headers, as well as the request and response data sent. Normally, only POST requests will contain request data.

JavaScript Trace

JavaScript tracing is only available for robots that use the Classic browser that was default in pre-9.3 robots. If you have a robot that uses the Default browser, the JavaScript tab will not be available.

Below each JavaScript trace, the JavaScript source code for the currently selected trace entry is shown. When a trace entry is selected, the corresponding source code line is highlighted in the source view. The trace entry is the runtime result of the execution of the highlighted source code line. Each source code line may, of course, be executed multiple times, in which case multiple trace entries are produced - all corresponding to the same source code line.

Stepping through trace entries can help you understand how a piece of JavaScript code works.

It is possible to turn off tracing of JavaScript if you are only interested in the HTTP trace. You do this by removing the check mark from the "Enable JavaScript Tracing" option in the Trace menu.

Saving and Loading Trace Sessions

Trace sessions can be saved and loaded at a later time. A trace session contains both the Design Studio trace and the proxy trace, and both JavaScript and HTTP traces. Saving a trace session can be useful if it is large and you want to look at it in detail at a later time, or if you want to mail it to someone else.

Note that bug reports submitted from Design Studio will automatically contain the current trace session, if any.