What is the expected response when we make request via Postman using url and base64 sources?

> Please provide us with the following information:
> ---------------------------------------------------------------

### This issue is for a: (mark with an `x`)
```
- [x] bug report -> please search issues before submitting
- [ ] feature request
- [x] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)
```

### Minimal steps to reproduce
> See screenshot below

### Any log messages given by the failure
> See screenshot below

### Expected/desired behavior
> Ideally, I'm expecting a response when a request is made to track the request sent.

### OS and Version?
> Windows 7, 8 or 10. Linux (which distribution). macOS (Yosemite? El Capitan? Sierra?)

Windows 11

### Versions
> Python 3.11

### Mention any other details that might be useful
For urlSource works but what is it we need to do with it as there is nothing to track?

For base64Source I receive below error

Start by reviewing the Postman request details and the screenshots for urlSource and base64Source, using the Python 3.11 and Windows 11 context provided. No repository file or test is named; done would require identifying and documenting the expected response and the cause of the base64Source error.

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