A Connect/Express style middleware for parsing the Accept-Events header field
npm install express-accept-eventsAccept-Events header field specified in Per Resource Events.
sh
npm|pnpm|yarn|bun add express-accept-events
`
Usage
In case one is using an Express server:
`js
import AcceptEvents from "express-accept-events";
const app = express();
app.use(acceptEvents);
`
The middleware populates req.acceptEvents with a list of notification protocols and their corresponding parameters (sorted by the value of a q parameter, if provided) in GET and POST requests. For Example, the following HTTP request:
`http
GET /notifications HTTP/1.1
Host: example.com
Accept: text/plain
Accept-Events: "prep"; accept="message/rfc822"; q=0.9, "solid"; type="WebSocket2023"
`
with the GET handler, so specified:
`js
app.get("/foo", (req, res) => {
console.log(req.acceptEvents);
});
`
will result in the output:
`sh
[
[ "solid", Map(1) { "type" => "WebSocket2023" } ]
[ "prep", Map(2) { "accept" => "message/rfc822", "q" => 0.9 } ]
]
`
Errors
In case the middleware fails to parse the Accept-Events header field, the req.acceptEvents` property is not created.