Forked from maxm/SSEDemo
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A re-implementation of https://robpike.io/
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const msg = new TextEncoder().encode("💩");
const initialDelay = 20;
export default async function(req: Request): Promise<Response> {
let timerId: number | undefined;
const body = new ReadableStream({
start(controller) {
let currentDelay = initialDelay;
function writeToStream() {
currentDelay *= 1.03;
controller.enqueue(msg);
timerId = setTimeout(writeToStream, currentDelay);
}
writeToStream();
},
cancel() {
if (typeof timerId === "number") {
clearInterval(timerId);
}
},
});
return new Response(body, {
headers: {
"Content-Type": "text/event-stream",
},
});
}
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v11
June 7, 2024