SSEGWSW: Server-Sent Events Gateway by Service Workers

Quick start

1. npm install
2. npm start
3. Open http://localhost:8081/example/

Problem

Details

Browsers limit the number of HTTP connections with the same domain name.
This restriction is defined in the HTTP specification (RFC2616).
Most modern browsers allow 6 connections per domain.
Most older browsers allow only two connections per domain.

You cannot make HTTP requests anymore, if you open 6 SSE connections to one domain.

Solution

1. Intercept SSE requests using Service Worker
2. Open only one SSE connection from SW to server for unique url
3. Forward data from server to browser tabs