"The basic principle behind REST status code conventions is that a status code must make the client aware of what is going on and what the server expects the client to do next"

You can fulfill this principle by giving answers to the following questions:Is there a problem or not?If there is a problem, on which side is it? On the client or on the server side?If there is a problem, what should the client do?

The difference is what the server expects the client to do next.

What produces that text, and what do you want to use it for?

The question on the title: replace space with new line The simple, quick, brute force solution is to do exactly that, replace all spaces with new lines:

But in your question you are listing a list of paths:

However you're probably asking the wrong question. (Not necessarily, for example this might come up in a makefile.)