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Graph/websocket-proxy-upgrade-header-mismatch

Pattern

WebSocket Proxy Upgrade Gap

websocket-proxy-upgrade-header-mismatch

A recurring WebSocket failure where direct clients succeed but proxied React/wss connections fail unless the proxy is configured for HTTP/1.1 and the Upgrade/Connection headers are forwarded, sometimes requiring TLS handling instead of disabling security.

Node Details

Public graph metadata

Updated5/1/2026

Connections

30 linked nodes

I'm building a Next.js 14 app that uses Zustand with the persist middleware to store authentication tokens and user info. Tension: authenticated pages redirect me to /error/unauthorized. Outcome: React has detected a change in the order of Hooks...

implementation and tests still encoded dual-mode behavior — A TypeScript standalone gateway migration was documented as clean-break standalone-only. Tension: default mode was plugin, default port was the old host-gateway port, an env flag switched standalone behavior, legacy env fallbacks were still honored, and post-cutover tests rejected the intentionally preserved external workspace path.

Axios requests need to work on both client and server in Next.js while switching between DEVICE_TOKEN and AUTH_TOKEN for authentication

passing health checks but its Bash cutover and post-cutover verification scripts exited early or misreported failure — A Node/TypeScript gateway cutover harness. Tension: The scripts used `set -euo pipefail`, post-increment arithmetic such as `((elapsed++))` / `((PASS_COUNT++))`, brittle command-output parsing for npm preflight status, and exact JSON-shape assumptions for RPC verification.

errors with 502 and 504 HTTP codes are ignored by Sentry — I'm using Sentry to catch errors in my React app. Tension: some React errors are ignored too. Outcome: I'd like to override this behavior.

I have a problem with Websocket authentication using Laravel's broadcasting with Pusher. — From time to time it returns 403 when JTW token is refreshed. Tension: How can I log all 4xx and 5xx requests to Sentry?

FastAPI websocket closes immediately after accept() and send_text()

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.

When I send an HTTPS request using the Swagger UI. Tension: the redirection then fails. Outcome: I found a solution by referring to this GitHub issue: https://github.com/encode/uvicorn/issues/369.

intermittently logged `[REDACTED]` after fresh browser loads and route changes — A custom activity/chat overlay. Tension: The page checked the gateway browser client for an open WebSocket and then immediately sent RPCs such as session subscribe/list/history. Outcome: The client flag represented the raw socket state, not completion of the gateway's first-frame `connect` handshake.

WebSocket connection to 'wss://xxx:3500/' failed: — when connecting via WebSocket in React. Tension: but when connecting via Websocket in React, it throws always this error.

this dependency has 2 critical vulnurabilities — org.eclipse.jetty jetty-websocket 8.1.1.v20120215. Tension: there are no correspondng version of `jetty-websocket` so I have no idea how can I fix this issue. Outcome: Those vulnerabilities are fixed in jetty-server » 9.3.24.v20180605.

Dependabot flagged this issue but cannot update webpack-dev-middleware to a non-vulnerable version. Tension: updating to a secure version seems non-trivial.

Running an old React app on Node.js >18 fails during `npm start` with an error related to webpack/OpenSSL compatibility, and the environment variable `SKIP_FLIGHT_CHECK` plus OpenSSL legacy provider workaround is being considered.

close: Bad file descriptor (9) — proxychains google-chrome-beta dnsleaktest.com. Tension: the core gets dumped due to "Bad file descriptor". Outcome: Trace/breakpoint trap (core dumpe.

I want to accept that fact that proxy is using insecure TLS certificates but I still want to establish secure TLS session to my destination. Tension: I can only disable TLS verification to both proxy and destination with `InsecureSkipVerify`.

The session identifier (req.sessionID) changed on every subsequent HTTP request from the React client to the Express server, preventing consistent session persistence.

this is what my WebSocketConfig.java looks like — registry.addEndpoint("/ws").withSockJS();. Tension: the CORS configuration is missing in the WebSocketConfig. Outcome: Try adding the following and attempt again.

WebSocket connection fails in the browser when using the Docker service name as the host

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.

A Spring Boot WebSocket client fails to establish a connection to Binance when the WebSocket URL becomes long (e.g., ~300 symbols), while shorter URLs (~200 symbols) work. There are no clear logs or error messages, and Postman succeeds with the same long URL.

I'm trying to connect to a `WebSocket` from a `WebView` in JavaFX. Outcome: JDK-8331765, affecting multiple versions, is relevant.

the first request is always failing since the http-proxy doesn't recognize it as a websocket request. Tension: I struggled to decrypt the accessToken in time and add it to the request before it's sent. Outcome: for now it's not bothering me that much.

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.

Wget before 1.21.1 forwards HTTP Authorization headers to different origins when following cross-origin redirects. — when following cross-origin redirects. Tension: An attacker-controlled server can respond with a 302 redirect to its own domain and capture the victim's credentials. Outcome: This is a critical information-leak vulnerability that affects users who authenticate to legitimate websites and are then redirected to attacker-controlled servers.

heap buffer overflow vulnerability in curl's SOCKS5 proxy handshake when processing hostnames — when processing hostnames. Tension: the hostname length is truncated to a single byte via an unsafe cast, but the full hostname is still copied into the buffer. Outcome: causing heap memory corruption.

WebSocket connections to external services use Sandbox.WebSocket, not System.Net.WebSockets (sandboxed out) — In s&box. Tension: Developers need WebSockets for real-time external data (chat, live scores, IoT). The same URL restrictions as Http apply — no IP addresses, HTTPS/WSS only.

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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