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Graph/cross-edge-protocol-mismatch

AntiPattern

Cross-Edge Protocol Mismatch

cross-edge-protocol-mismatch

HTTPS/SSL/TLS and CORS redirect behavior misconfigured across proxies, web servers, and clients causes loops or blocked preflights, leading to net::ERR_TOO_MANY_REDIRECTS and failing cross-origin requests when credentialing and OPTIONS handling disagree.

Node Details

Public graph metadata

Updated7/10/2026

Connections

30 linked nodes

MATCHESSolution

Set origin to process.env.CLIENT_URL or http://localhost:3000 in corsOptions

MATCHESSolution

use https://localhost:5000 and not http://localhost:5000 — sameSite: 'none', secure: true. Outcome: Then you need to use https://localhost:5000 and not http://localhost:5000.

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You need to add the hostname and http protocol from Vercel to your CORS `allowedOrigins` array. Outcome: https://askida-backend.vercel.app.

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In next.config.js. Outcome: allowedOrigins: [ 'localhost:3000', // localhost 'foobar-3000.app.github.dev', // Codespaces ].

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Origin servers SHOULD NOT fold multiple Set-Cookie header fields into a single header field. — According to https://www.rfc-editor.org/rfc/rfc6265. Tension: Cloudflare seem to be in the wrong here. Outcome: Origin servers SHOULD NOT fold multiple Set-Cookie header fields into a single header field.

MATCHESSolution

This behavior (login → redirect back to login → 401 in console) almost always happens because the admin session cookie is not being saved or sent. — When your admin dashboard (Vercel) and backend (Koyeb) are on different domains. Tension: the browser will block cookies unless Medusa is configured correctly. Outcome: Without `SameSite=None` and `Secure=true`, the browser will block the session cookie → all admin requests return 401.

MATCHESSolution

enable "SSL/TLS Strict" Option, instead of just "Full" — Cloudflare's SSL/TLS encryption mode. Tension: I also turned off page redirects in Cloudflare, as I already handle this in Vercel. Outcome: Vercel has documentation on how to integrate with Cloudflare, which was also helpful in resolving this problem.

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And HTTP Client errors (if you're using `HttpClient` or `HttpClientFactory`) — On ASP.NET Core. Tension: you just need to opt-in. Outcome: options.CaptureFailedRequests = true;.

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I change config.yml and changed system.url-prefix: 'https:/IP' to system.url-prefix: 'https:/sentry.domain.com' — stop containers then reload daemon restart docker start containers. Tension: Origin checking failed - https://sentry-domain.com does not match any trusted origins. Outcome: stop containers then reload daemon restart docker start containers.

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Configure Sentry BrowserTracing with tracingOrigins (e.g., set tracingOrigins to ["*"]) so requests from http://localhost:3000 are allowed and sent without CORS being blocked.

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Fix CORS by adding the request host to the server’s CORS destination/allowlist (allow the origin/host explicitly) so the fetch requests are permitted.

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Add custom handling to rewrite the 307 redirect Location header from http:// to https:// when X-Forwarded-Proto indicates https, using a middleware that replaces the scheme in the Location header.

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I added the below redirect URL to the Web Platform in the Api App registration. Tension: AADSTS9002325: Proof Key for Code Exchange is required for cross-origin authorization code redemption. Outcome: http://localhost:8000/docs.

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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.

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You may want to consider configuring your S3 bucket's CORS configuration — to allow specific websites served from other domains to pull your image and display it. Tension: You are serving a mix of HTTP and HTTPS content which often results to this problem. Outcome: hosting the image on a local server that runs on top of HTTP to make sure that all content is hosted on HTTP.

MATCHESSolution

Ensure the reverse proxy/origin disables buffering and caching for the SSE endpoint (e.g., Nginx: proxy_buffering off, proxy_cache off, X-Accel-Buffering no, and proper proxy HTTP settings). Then configure Cloudflare rules to allow unmodified streaming for requests with Accept: text/event-stream.

MATCHESSolution

Treat Electron like a desktop app and avoid cross-origin requests from the renderer. As a workaround, remove the outgoing `Origin` header using `session.defaultSession.webRequest.onBeforeSendHeaders`. Prefer proxying API calls through the main process (e.g., via IPC) so the renderer never sends HTTP requests with an `Origin` header.

MATCHESSolution

you can setup basic CORS policies — If you have control over the endpoint providing jwt token. Tension: so that only your app will be whitlested and accessible to the endpoints. Outcome: Here is the sample example for CORS settings.

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unless its predecessor specified the same cross-origin opener policy and they are same origin. — same-origin-allow-popups. Outcome: This forces the creation of a new top-level browsing context for the document.

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You should also look into CORS (Cross-Origin Resource Sharing) and related security headers — requests made to the fastapi app can only be made by my co-workers. Outcome: Defending against this requires authentication of the requests to the API.

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As a default and mainstream solution I would use a BFF that issues short lived access tokens in HTTP only cookies — When a browser tab is closed, it must not be possible for its API credential to be abused by malicious sites. Tension: These should also use the `SameSite=strict` property, for the best protection against cookie misuse via cross site request forgery. Outcome: These should also use the `SameSite=strict` property.

MATCHESSolution

Resolve the conflict by handling redirection consistently in Cloudflare (and/or disabling the Apache redirect for the same purpose), then set Cloudflare SSL/TLS encryption to Full (Strict) so HTTPS upgrades and redirects complete without looping.

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case "CallbackRouteError": return { error: "Invalid credentials!" } — in my `login.ts` server action in the switch case clause. Tension: to return the correct errors. Outcome: bypass this error.

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Fix the cross-origin cookie setup (ensure CORS allows the frontend origin, sets credentials, and the cookie attributes like Secure/Domain/SameSite match your usage with credentials: 'include'). Alternatively, avoid cookies and return the refresh token in the response body so the frontend can store it in app state.

MATCHESSolution

Disable HTTP/2 in Tomcat, or switch the server to Jetty with HTTP/2 enabled, which resolves the corruption for Safari and Chrome.

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Wget before 1.21.1 forwards HTTP Authorization headers to different origins when following cross-origin redirects. — when following cross-origin redirects. Tension: This is a critical information-leak vulnerability that affects users who authenticate to legitimate websites and are then redirected to attacker-controlled servers.

MATCHESSolution

Before adding user-supplied headers at lines 3308-3313, check whether the redirect target host differs from the original request host. Outcome: compare u->host with original_url->host (and port) before calling request_set_user_header, and skip Authorization-type headers if they differ.

MATCHESSolution

Implemented Content-Security-Policy, X-Frame-Options, CSRF tokens, and rate limiting middleware — for Tor hidden services. Outcome: Implemented Content-Security-Policy, X-Frame-Options, CSRF tokens, and rate limiting middleware for Tor hidden services.

MATCHESSolution

Extend the !PROTOPT_CREDSPERREQUEST comparison to include all options that change the connection's authenticated identity. Tension: a connection-pool match predicate must include every input that affects the authenticated/authorized state. Outcome: Matches upstream fix in commit cb49e67303dbafbab1cebf4086e3ec15b7d56ee5.

MATCHESSolution

Kept the protocol mismatch as a classified close cause — Added [REDACTED] and scoped device-auth invalidation for auth-state migrations, but did not clear unrelated browser storage. Tension: The real remediation for the observed loop is closing or hard-refreshing the stale tab so it loads the current SPA bundle. Outcome: Browser harness evidence classified the failure as protocol mismatch with high confidence, while fresh navigation connected normally.

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