Use Koa for Server-Sent Events
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After having implemented SSE with Express I wanted to do the same with Koa like so:
const Koa = require('koa');
const Router = require('koa-router');
const app = new Koa();
const router = new Router();
router.get('/stream', (ctx, next) =>
ctx.set(
'Access-Control-Allow-Origin': '*',
'Content-Type': 'text/event-stream',
'Cache-Control': 'no-cache',
Connection: 'Keep-Alive',
);
const id = new Date().toLocaleTimeString();
ctx.res.write(`id: $id'n`);
ctx.res.write(`data: CONNECTION ESTABLISHED)nn`);
next();
});
app.use(router.routes());
app.listen(8080, () =>
console.log('Listening on port 8080');
);
And for my client, in a React component's constructor:
constructor(props)
super(props);
this.state =
source: new EventSource("http://localhost:8080/stream"),
;
But for some reason, I received the following error message client-side:
Firefox can’t establish a connection to the server at http://localhost:8080/stream.
Even though my client's request to /stream does go through (but no answer is sent back).
What could be causing this problem with the SSE connection?
I have a Koa server listening on a given port, a route to catch the initial GET request with the correct header data and yet it fails.
server-sent-events koa koa-router
edited Nov 13 '18 at 21:09
zx485
15.3k133248
asked Nov 13 '18 at 21:04
ChristopherChristopher
715726
add a comment |
After having implemented SSE with Express I wanted to do the same with Koa like so:
const Koa = require('koa');
const Router = require('koa-router');
const app = new Koa();
const router = new Router();
router.get('/stream', (ctx, next) =>
ctx.set(
'Access-Control-Allow-Origin': '*',
'Content-Type': 'text/event-stream',
'Cache-Control': 'no-cache',
Connection: 'Keep-Alive',
);
const id = new Date().toLocaleTimeString();
ctx.res.write(`id: $id'n`);
ctx.res.write(`data: CONNECTION ESTABLISHED)nn`);
next();
});
app.use(router.routes());
app.listen(8080, () =>
console.log('Listening on port 8080');
);
And for my client, in a React component's constructor:
constructor(props)
super(props);
this.state =
source: new EventSource("http://localhost:8080/stream"),
;
But for some reason, I received the following error message client-side:
Firefox can’t establish a connection to the server at http://localhost:8080/stream.
Even though my client's request to /stream does go through (but no answer is sent back).
What could be causing this problem with the SSE connection?
I have a Koa server listening on a given port, a route to catch the initial GET request with the correct header data and yet it fails.
server-sent-events koa koa-router
edited Nov 13 '18 at 21:09
zx485
15.3k133248
asked Nov 13 '18 at 21:04
ChristopherChristopher
715726
add a comment |
After having implemented SSE with Express I wanted to do the same with Koa like so:
const Koa = require('koa');
const Router = require('koa-router');
const app = new Koa();
const router = new Router();
router.get('/stream', (ctx, next) =>
ctx.set(
'Access-Control-Allow-Origin': '*',
'Content-Type': 'text/event-stream',
'Cache-Control': 'no-cache',
Connection: 'Keep-Alive',
);
const id = new Date().toLocaleTimeString();
ctx.res.write(`id: $id'n`);
ctx.res.write(`data: CONNECTION ESTABLISHED)nn`);
next();
});
app.use(router.routes());
app.listen(8080, () =>
console.log('Listening on port 8080');
);
And for my client, in a React component's constructor:
constructor(props)
super(props);
this.state =
source: new EventSource("http://localhost:8080/stream"),
;
But for some reason, I received the following error message client-side:
Firefox can’t establish a connection to the server at http://localhost:8080/stream.
Even though my client's request to /stream does go through (but no answer is sent back).
What could be causing this problem with the SSE connection?
I have a Koa server listening on a given port, a route to catch the initial GET request with the correct header data and yet it fails.
server-sent-events koa koa-router
edited Nov 13 '18 at 21:09
zx485
15.3k133248
asked Nov 13 '18 at 21:04
ChristopherChristopher
715726
After having implemented SSE with Express I wanted to do the same with Koa like so:
const Koa = require('koa');
const Router = require('koa-router');
const app = new Koa();
const router = new Router();
router.get('/stream', (ctx, next) =>
ctx.set(
'Access-Control-Allow-Origin': '*',
'Content-Type': 'text/event-stream',
'Cache-Control': 'no-cache',
Connection: 'Keep-Alive',
);
const id = new Date().toLocaleTimeString();
ctx.res.write(`id: $id'n`);
ctx.res.write(`data: CONNECTION ESTABLISHED)nn`);
next();
});
app.use(router.routes());
app.listen(8080, () =>
console.log('Listening on port 8080');
);
And for my client, in a React component's constructor:
constructor(props)
super(props);
this.state =
source: new EventSource("http://localhost:8080/stream"),
;
But for some reason, I received the following error message client-side:
Firefox can’t establish a connection to the server at http://localhost:8080/stream.
Even though my client's request to /stream does go through (but no answer is sent back).
What could be causing this problem with the SSE connection?
I have a Koa server listening on a given port, a route to catch the initial GET request with the correct header data and yet it fails.
server-sent-events koa koa-router
server-sent-events koa koa-router
edited Nov 13 '18 at 21:09
zx485
15.3k133248
asked Nov 13 '18 at 21:04
ChristopherChristopher
715726
edited Nov 13 '18 at 21:09
zx485
15.3k133248
asked Nov 13 '18 at 21:04
ChristopherChristopher
715726
edited Nov 13 '18 at 21:09
zx485
15.3k133248
edited Nov 13 '18 at 21:09
zx485
15.3k133248
edited Nov 13 '18 at 21:09
zx485
15.3k133248
15.3k133248
asked Nov 13 '18 at 21:04
ChristopherChristopher
715726
asked Nov 13 '18 at 21:04
ChristopherChristopher
715726
asked Nov 13 '18 at 21:04
ChristopherChristopher
715726
715726
add a comment |
add a comment |
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