render a response or forward template against a sample request without creating an expectation

Dry run of a Velocity, Mustache or JavaScript template. Renders the template against the sample request with the same engines, sandbox settings and JavaScript and Velocity timeouts as serving, and reports the rendered response (or request, for a forward template), or the failure with the template line and column where the engine reports one and a hint for common mistakes. A Velocity reference or Mustache variable that did not resolve, and a scenario.set call, are reported as warnings; a dry run never changes scenario state and writes nothing to the event log. When javascriptTemplateExecutionTimeout or velocityTemplateExecutionTimeout is 0 a dry run still stops that template after 5 seconds. At most two dry runs run at once and further calls get a 429; a Mustache template, or a Velocity template inside one long Java call, cannot be stopped, so the response is written after the time limit plus a grace period even if the template is still running. Running a template needs a role that may change expectations.