HTTP transaction monitor with capacity to replay in debuggings session

A system for testing and debugging a web application, comprising:

• a server which hosts the web application;
• a client which accesses components of the web application by sending HTTP requests to the server and receiving HTTP responses from the server;
• a data collector which runs on the server and collects data from the HTTP requests and the HTTP responses;
• a debugging controller which runs on the client and controls an execution mode of the server;
• a graphical display which displays the collected data and through which replay requests are sent to the server, each replay request specifying a prior HTTP request to be interpreted by the server;
• and
• a request player which runs on the server and modifies each replay request with a portion of the collected data associated with the prior HTTP request to be interpreted by the server.