Note this is a direct fork of node-SseStream. It just changes the header that the server uses for caching.

More info on this change:

The header 'Cache-Control': 'no-transform' is needed for proxies that interfere with the request (such as caching). This was the case with the create-react-app, when proxying requests to the dev-server backend to your real backend. See this issue: https://github.com/facebook/create-react-app/issues/1633#issuecomment-291353470 . Maybe this header isn't always desired, but I didn't know a good way to make this configurable other than passing a 3rd argument to this pipe function, or maybe an extra parameter to the constructor allowing users to overwrite some of these headers if they want.

SseStream

A node stream for writing Server-Sent Events

Installation

npm install ssestream-no-cache-transform

Or:

yarn add ssestream-no-cache-transform

Usage

In a (req, res) handler for a request event, Express #get route or similar:

const SseStream = require('ssestream-no-cache-transform')

function (req, res) {
  const sse = new SseStream(req)
  sse.pipe(res)

  const message = {
    data: 'hello\nworld',
  }
  sse.write(message)
}

Properties on message:

• data (String or object, which gets turned into JSON)
• event
• id
• retry
• comment