Protocol version from JavaScript Fetch responses

I was just playing with Fetch and noticed it seemed impossible to get the protocol version from the response start line. During an HTTP request the first line of a response could look like this:

HTTP/1.1 404 Not Found

Basically, I am looking for a way to get the HTTP/1.1 part of the first line.

I was able to find the Response.status and Response.statusText properties, but is there a way to get either the first line (which does not seem to be part of Response.headers) or the protocol version directly?

Answer

The short answer is: No, it’s not possible.

I could actually not find details on the “long answer” and why this information was unavailable.