[Scripting] The `response.rawBody` property does not preserve the original request body payload

Description

I just spotted an issue when I needed to amend the response with a dynamically modified property and calculated signature on the client side (Proxyman). As a result, it has turned out that the response.rawBody property does not guarantee its contents to be exactly the same as the body response payload, which resulted in being unable to calculate the proper signature (the raw response body was different in the script and in the client app).

Steps to Reproduce

1. Add the following snippet for scripting for any of the endpoints:

async function onResponse(context, url, request, response) {
  console.log("\n" + response.rawBody);
  return response;
}

2. Perform any request that runs the script.
3. Observe the logs, compare the request body and the console logs.

Current Behavior

The logged body contents differ from the ones in the response body.

Expected Behavior

The logged body contents should be the same as the ones in the response body in the Proxyman window.

Environment

• App version: e.g Proxyman 4.8.1
• macOS version: e.g macOS Ventura 13.4.1 (22F82)

Please tell me if you need more support by reproducing the issue, or if I can help in some other way.

Cheers!

Start by locating the scripting implementation of response.rawBody and reproduce the issue with the onResponse snippet from the report. Done means the value exposed to scripts preserves the response body exactly as shown in the Proxyman window; no source files or tests are named in the issue.