Fetch Response.statusText

Ever wondered why Response.statusText returns an empty string? It's because it is not part of the HTTP/2 spec.

HTTP/2 does not define a way to carry the version or reason phrase that is included in an HTTP/1.1 status line.

Otherwise, in HTTP/1 it will return status message such as OK, Continue and Not Found.

Reference:

• RFC 7540
• whatwg/fetch#599