Along the same lines, what is the need for an alternative to SSE? There are some issues with SSE in HTTP/1.1, but HTTP/2 pretty much fixes those. I am curious

Along the same lines, what is the need for an alternative to SSE? There are some issues with SSE in HTTP/1.1, but HTTP/2 pretty much fixes those. I am curious what problem(s) are being targeted with this solution.