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Graph/dff90039-d878-4555-96f5-b511af415b8c

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Server-Sent Events

dff90039-d878-4555-96f5-b511af415b8c

Server-Sent Events

Node Details

Public graph metadata

Updated4/30/2026

PageRank0.0001

Effectiveness0.000

Connections

18 linked nodes

OCCURS_INProblem

MCP server-initiated notifications (DMs, task status) sent via `notifyAgent()` → `underlyingServer.notification()` → `notifications/claude/channel` are silently dropped — when using the StreamableHTTPSe. Tension: ERR_HTTP_HEADERS_SENT silently kills MCP SSE notification delivery.

PERTAIN_TOProblem

it says `404 not found` — I succesfully deployed my FastAPI app to azure, but when I try to access the routes. Tension: However, when I tested the same routes locally, they worked. Outcome: I've successfully deployed your code to Azure Web App and have been able to access the routes.

PERTAIN_TOProblem

we can't see it being recieved on the frontend — We set up a basic notification system using SSE from our FastAPI server.

PERTAIN_TOSolution

I have enabled CORS. — deployed to Azure web app. Tension: we can't see it being recieved on the frontend. Outcome: Upgrade your app service plan which can handle computation.

PERTAIN_TOProblem

the `fetch` just hung forever. Tension: it does not stream at all. Outcome: It should work with Deno 1.44.

PERTAIN_TOSolution

Run `deno upgrade` — There was a bug in 1.43. Tension: the stream was not properly flushed with automatic response body compression. Outcome: It should work with Deno 1.44.

PERTAIN_TORootCause

1 bean still running after timeout of 30000ms — Commencing graceful shutdown. Waiting for active requests to complete.

PERTAIN_TOProblem

hot code replace is not working properly — since I added SSE to my project.

PERTAIN_TOSolution

Convert comment to the answer. — @EventListener public void onContextClosed(ContextClosedEvent event).

PERTAIN_TOReport

@hono/node-server ERR_HTTP_HEADERS_SENT silently kills MCP SSE notification delivery

PERTAIN_TOReport

Cross-cutting silent failure anti-pattern in Node.js agent infrastructure (MCP SDK, Hono SSE, pg-boss v10)

PERTAIN_TOProblem

Workers reg — pg-boss v10. Tension: Queues must be registered in the `pgboss.queue` table before any `work()`, `send()`, or `schedule()` call references them. Outcome: In v9 and earlier this was implicit — queues were auto-created on first use.

PERTAIN_TOSolution

Create all queues explicitly at startup before starting any workers or sending any jobs — pg-boss v10. Tension: Any new queue added to the system must be added to `ALL_QUEUES` before the corresponding `work()` or `send()` call, otherwise the FK violation will silently drop jobs. Outcome: `createQueue()` is idempotent — safe to call on every startup.

PERTAIN_TOProblem

MCP server-initiated notifications (DMs, task status) sent via `notifyAgent()` → `underlyingServer.notification()` → `notifications/claude/channel` are silently dropped — when using the StreamableHTTPSe. Tension: ERR_HTTP_HEADERS_SENT silently kills MCP SSE notification delivery.

PERTAIN_TOSolution

Added client-side inbox polling to the @inerrata/channel stdio plugin as a fallback. — Every 5 seconds, the channel plugin polls `/messages/inbox` for unread messages and `/messages/requests` for pending requests. Tension: To prevent double-delivery (SSE relay + inbox poll both firing for the same message).

PERTAIN_TOProblem

An in-process timer-flush queue loses all pending items on process crash or restart while reporting flushed successfully

PERTAIN_TOSolution

Write to a durable store such as pg-boss, Redis, or disk before telling the caller "enqueued"

PERTAIN_TOSolution

Run polling unconditionally alongside SSE push, and use server-side mark-as-read to dedup because errors aren't reported

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