Hono SSE Stream Closing Unexpectedly After 10 Seconds

Title: Hono SSE Stream Closing After 10 Seconds

Issue: Using Hono's

streamSSE

streamSSE

, the SSE connection closes after ~10 seconds, regardless of client (curl/browser). A minimal Node.js SSE server works fine.

Environment: Debian, localhost

Code snippet:

app.get("/render", (c: Context) => {
  return streamSSE(c, async (stream) => {
    while (true) {
      await stream.writeSSE({
        data: `It is ${new Date().toISOString()}`,
        event: "time-update",
      });
      await stream.sleep(1000);
    }
  });
});

app.get("/render", (c: Context) => {
  return streamSSE(c, async (stream) => {
    while (true) {
      await stream.writeSSE({
        data: `It is ${new Date().toISOString()}`,
        event: "time-update",
      });
      await stream.sleep(1000);
    }
  });
});

Logs show:

SSE connection initiated
Sending message #1: It is 2024-08-30T14:21:10.214Z
...
Sending message #9: It is 2024-08-30T14:21:18.236Z
Stream aborted by client

SSE connection initiated
Sending message #1: It is 2024-08-30T14:21:10.214Z
...
Sending message #9: It is 2024-08-30T14:21:18.236Z
Stream aborted by client

Any ideas why Hono's SSE implementation might be closing the connection prematurely? Tried error handling and abort detection, issue persists. Thanks for any help!

Hono•2y ago•

15 replies

Chris

Hono SSE Stream Closing Unexpectedly After 10 Seconds

Title: Hono SSE Stream Closing After 10 Seconds

Issue: Using Hono's

streamSSE

streamSSE

, the SSE connection closes after ~10 seconds, regardless of client (curl/browser). A minimal Node.js SSE server works fine.

Environment: Debian, localhost

Code snippet:

app.get("/render", (c: Context) => {
  return streamSSE(c, async (stream) => {
    while (true) {
      await stream.writeSSE({
        data: `It is ${new Date().toISOString()}`,
        event: "time-update",
      });
      await stream.sleep(1000);
    }
  });
});

app.get("/render", (c: Context) => {
  return streamSSE(c, async (stream) => {
    while (true) {
      await stream.writeSSE({
        data: `It is ${new Date().toISOString()}`,
        event: "time-update",
      });
      await stream.sleep(1000);
    }
  });
});

Logs show:

SSE connection initiated
Sending message #1: It is 2024-08-30T14:21:10.214Z
...
Sending message #9: It is 2024-08-30T14:21:18.236Z
Stream aborted by client

SSE connection initiated
Sending message #1: It is 2024-08-30T14:21:10.214Z
...
Sending message #9: It is 2024-08-30T14:21:18.236Z
Stream aborted by client

Any ideas why Hono's SSE implementation might be closing the connection prematurely? Tried error handling and abort detection, issue persists. Thanks for any help!

Hono SSE Stream Closing Unexpectedly After 10 Seconds

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