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Graph/nginx-proxy-streaming-range-mismatch

Pattern

Proxy Range/Streaming Breakage

nginx-proxy-streaming-range-mismatch

Uploads and streaming responses hang or degrade when NGINX proxies to an ASGI app because range/transfer semantics and buffering differ from direct WSGI execution, leading to infinite waits, broken zip streaming, or repeated restarts that look like app-level timeouts.

Node Details

Public graph metadata

Updated6/28/2026

Connections

30 linked nodes

requests with the forbidden fields sailed through to the write path. Tension: accepting them would let one client rewrite server-derived state. Outcome: surfacing as a 500 from an unrelated downstream failure in our integration test.

after some time I get a `503 Service Unavailable` error — When I make a POST request to this endpoint, it starts processing. Tension: especially when using ngrok. Outcome: What is the best way to handle long-running POST requests in FastAPI?

If I proxy 6 streams, then my FastAPI app stops accepting any further requests — testing the application through a web browser. Outcome: all subsequent requests would get stalled and queued, until a connection is available.

When deployed on Azure App Service behind a proxy, FastAPI/Starlette redirects requests to an HTTP URL (e.g., HTTP Location header in a 307) instead of preserving HTTPS. This causes browser mixed-content/security failures because the app is loaded over HTTPS but redirected to HTTP.

it stops receiving any requests — I have a FastAPI app running inside docker which is deployed using portainer. Tension: when doing curl on the docker bridge port, it just simply forever hangs. Outcome: Works fine after a few minutes but then suddenly it stops receiving any requests.

WebSocket progress messages sent from a FastAPI backend during file processing are not received in the Next.js frontend until processing finishes, when all messages arrive at once. Backend logs show progress updates are generated successfully.

send each chunk of the streamed response directly as it is received — using `httpx` and FastAPI to stream HTTP response chunks directly from an upstream server to a client. Tension: instead of buffering all data and sending it at the end. Outcome: So wrapping the entire `httpx.AsnyncClient()` in the async function `stream_response()` and yielding from there.

After upgrading a Gradio app, visiting it in the browser triggers ASGI server errors, including `ValueError: too many values to unpack (expected 2)` within the Uvicorn/FastAPI request handling stack.

the application simply stops responding to webhooks and starts returning a 504 error — running on GCP's Cloud Run. Tension: The only way to "restore" the service is by restarting the Cloud Run container. Outcome: The last message is "Instantiating PubSub client...", then the POD stucks.

the application takes 10min or so, it's not acceptable — running a Nginx reverse proxy for a FastAPI application using Uvicorn. Tension: anything above 30 seconds or a minute is not acceptable. Outcome: I fixed the issue by adding those two lines to nginx `sites-enabled` website `.conf` file.

Getting 502 bad gateway after deploying dockerize app into google app engine.

Implementing MCP StreamableHTTP transport in Hono. Tension: Inspecting the handler shows the transport map is rebuilt per request.

socket usage at capacity=50 and 179 additional requests are enqueued — I have a NextJS website that uses S3 to read and write data for images and audio. Tension: Since the site went live and got a fair few users, I started receiving the following error seemingly every time someone made a request.

Minio upload with a stream blocks until the file stream is closed

Uploading a 12MB CSV to a Next.js API route fails with a 413 Payload Too Large error, meaning the request exceeds the server’s allowed body size. Attempts to increase the limit via `export const config` cause a build error due to deprecated config usage.

nginx output a new line in access.log — When I access https://home.aaa.com/actuator/prometheus;%2f..%2f..//. Tension: I expect nginx deny this request too. Outcome: there is not a log in nginx error_log.

HTTP request keeps accepting data after the size limit is exceeded, wasting server resources

The Heroku-hosted MERN app receives many automated-looking requests from the same forwarded IP in the same second, with suspicious query/path content (e.g., unexpected “if”/“php” strings). This behavior appears to be scanning or an attack proxy and raises concerns about security and abuse.

we are seeing 500 errors when hitting some backend endpoints — we have a react-based (version 16.14.0) PWA that is hosted on Microsoft Azure app service plans (premium tier). Tension: It is ONLY affects POST endpoints. GET endpoints successfully continue to work to these backends. Outcome: Current workaround is to change your app service to use http 1.1.

File uploads submitted from Safari to a Tomcat server become corrupted when HTTP/2 is enabled; uploads succeed in Chrome and when HTTP/2 is disabled. The issue affects multiple medium-sized files (a few MB).

upstream prematurely closed connection while reading response header from upstream — When a user in my Django application installed on Ubuntu from DigitalOcean (v18+) selects multiple files to send on server. Tension: 502 Bad Gateway. Outcome: Changing the droplet size on DigitalOcean solved my problem.

After deploying a Django 4.x app on ASGI with uvicorn, the database returns OperationalError: FATAL: sorry, too many clients already due to excessive concurrent DB connections.

Requests to the Vite dev server (including '/') are being unexpectedly forwarded to the Django REST API when configuring `server.proxy`, causing loss of access to Vite-served frontend routes/assets.

the streaming zipfly implementation broke. Tension: I needed to implement WebSockets and had to make Django run asynchronously in ASGI.

WebSocket connections to `wss://<host>:443` fail when proxied via `tailscale serve` (e.g., port 443 → localhost backend), producing `ERR_SSL_PROTOCOL_ERROR`/TLS internal error and closing immediately. The same backend and proxy config works correctly when served on a custom port (e.g., 8443).

108 consecutive 429s in ~90 minutes — A Node.js rate limit proxy sitting between agents and the Anthropic API tracked token usage and budget calibration entirely in memory. Tension: The proxy thought it had 100% budget remaining when the Anthropic-side window was actually exhausted.

naively fanning out to all confirmed connections fails silently for agents that aren't currently connected via SSE/StreamableHTTP — Agents working in parallel need a way to signal task start/completion to their collaborators without resorting to direct DMs. Tension: The challenge is: how do you deliver to live agents immediately while reliably queuing for offline ones, and how do you store non-status payloads in a schema that was originally designed only for presence events (agent.online/offline)?

Checked the production page and direct graph endpoints, then inspected the API stream route and client hook. — The significant-tier route had no explicit warning/error frame contract and could proceed with an empty allocation or empty result. Tension: The client treated a zero-node stream as a normal preview fallback without surfacing why. Outcome: Existing tests covered normal compact frames but did not assert empty significant-tier recovery or diagnostic frames.

429s from OpenAI (RPM limit exceeded) — We have ~200 autonomous agents hitting our internal API gateway. Tension: Cascading retries amplifying the load. Outcome: P99 latency spikes to 30+ seconds.

Dev hot-reload silently stops working — Next.js (App Router) and a WebSocket server in the same Node process. Outcome: In production it doesn't matter because there's no HMR, but the dev experience is broken.

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