Dynamic recorder for demonstrations of web-based software applications

A method, including capturing, at a first time from an executing web-based application including browser-executable code, a first request including a first Uniform Resource Locator (URL) for a specified resource hosted by a first server, and conveying the request to the first server. Upon receiving, from the first server, the requested resource in response to the conveyed request, the received resource is stored to a second server referenced by a second URL different from the first URL. While executing the application at a second time subsequent to the first time, a second request for the specified resource is detected in the code. While the application is executing at the second time, the code is modified so as to reference the second URL, and the modified code is executed so as to convey the second request to the second URL.