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Graph/websocket-reverse-proxy-miswiring

Pattern

WebSocket Reverse-Proxy Miswiring

websocket-reverse-proxy-miswiring

A recurring WebSocket connectivity failure where secure client traffic (wss) works only in Postman, but fails in apps because the reverse proxy is missing or misconfiguring upgrade/forward headers and proxy settings.

Node Details

Public graph metadata

Updated5/1/2026

Connections

30 linked nodes

Building a PayloadCMS (Next.js) app fails with a Webpack `UnhandledSchemeError` when encountering the `cloudflare:sockets` module.

"x-forwarded-host`header with value`foobar-3000.app.github.dev`does not match`origin`header with value`localhost:3000` from a forwarded Server Actions request. Aborting the action.". Tension: the problem is occurring elsewhere in the application. Outcome: Aborting the action.

[GET] [middleware: "middleware"] / status=401 — I deployed the site on vercel and it shows a status 401 on my middleware file. Tension: The message attempts show that it fails whenever I create a new user, update a user's name, or delete them. Outcome: you have to change your webhook public route from `/app/api/webhooks/clerk/route.ts` -> `/api/webhooks/clerk` or `/api/webhooks(.*)`.

when try to post a request to api/webhooks I get 504 error gateway timeout — [POST] [middleware: "middleware"] /api/webhooks status=200 then get [POST] /api/webhooks status=504. Tension: Task timed out after 10.02 seconds. Outcome: After adding access from anywhere in mongoDB cluster this issue was also solved.

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?

the build is error when starting SSR build with multiple error regarding Module not found: Can’t resolve ‘webpack’ — when I build the app on AWS Amplify. Tension: everything is fine on localhost and before integrating Sentry.

Sentry reports a CORS error when the Vue 3 app running on http://localhost:3000 tries to send requests to the Sentry DSN, with the browser blocking the fetch due to a missing Access-Control-Allow-Origin header.

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

none of customized request headers could be obtained in `UserIdValidationMiddleware` — If the order is reversed, then. Tension: It is not on the axios side. Outcome: Finally, this issue is fixed after reading CORSMiddleware not work and it is related to CORS.

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.

axios made the requests to `http://sub.domain.tld/api/path`, while my reverse proxy forwarded that to the IP:Port

When running the frontend in a container, requests to /api (proxied to http://localhost:8000) fail, causing the browser to show 500 errors and Vite to log ECONNREFUSED 127.0.0.1:8000.

Error: read ECONNRESET — POST request in postman that recieves an audio file, and 2 params. Outcome: "There was an error parsing the body".

The Flutter Linux app calling local FastAPI endpoints fails with a DioException [bad response] due to an HTTP 307 (Temporary Redirect). Postman requests succeed, but the app always receives the redirect response.

errno: -111, code: 'ECONNREFUSED', syscall: 'connect', address: 'localhost', port: 54321 — I have a vitest suite I'm trying to run in a GitHub workflow - the tests uses supabase-js / supabase.auth.signUp to create authenticated users. Tension: the workflow uses supabase/setup-cli@v1 - supabase CLI works fine. Outcome: Is the Supabase CLI action not intended to expose the web API?

stripe listen --forward-to localhost:8000/payment/webhook/ still returns 403

Fastify + Zod validation prevented access to the original/unmodified request body needed to verify a webhook signature, causing the signature verification to fail with the initial handler code.

Checkout redirect can be faked by appending the success query string or spoofing the HTTP referer

React SPA routes fail when copied and pasted URLs are not working

Executing an authenticated AWS AppSync GraphQL mutation from a Next.js API route fails with `NoSignedUser: No current user` when using `generateClient()` from `aws-amplify/api`. Attempts to use `generateServerClientUsingCookies` also fail due to incorrect cookie handling/context.

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.

Recently they changed the security protocol to TLSV1.2 and so I can no longer access it. Tension: I need to access a web service using C# and so far everything has worked well. Outcome: System.Net.WebException: The underlying connection was closed: Unexpected error on a send.

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

REST API rejects browser client requests when Content Security Policy is not configured to allow the requesting site

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.

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.

Whitelabel Error Page 403 Access Denied — after deployment. Tension: localy using Postman everything is ok. Outcome: This error indicates that you are not authorized to access the requested resource.

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