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Reverse Proxy Config Diagnostic & Fix Generator
A web-based tool where users paste their docker-compose.yml, reverse proxy config (Nginx/Traefik/Caddy), and environment variables. The tool runs a rule engine that detects WebSocket origin mismatches, port stripping issues, and header forwarding gaps, then outputs corrected config snippets specific to their proxy software. Targets self-hosters who spend hours debugging deployment configs.
Why this matters
You are a self-hoster running n8n or a similar WebSocket-dependent app behind an Nginx or Traefik reverse proxy on a non-standard port because your network or hosting constraints require it. Suddenly the UI goes blank or shows 'Connection lost' every few seconds. The logs say 'Invalid origin' but your environment variables look correct. You search online and find a dozen different fixes across blog posts, GitHub issues, and forum comments — each for a different proxy setup. You try them one by one, spending an entire night without success. One user even patched source code out of desperation. You wish there were a tool that looked at your actual config files and told you exactly which line to change.
- · Built for Self-hosters and homelab operators deploying WebSocket-dependent applications (n8n, Home Assistant, Grafana, code-server) behind reverse proxies on non-standard ports, who lack DevOps expertise and spend hours on config debugging..
- · Most likely monetization: Freemium — free paste-and-diagnose for basic checks, paid tier ($9/mo) for batch validation, multi-app support, config history, and priority rule updates.
The Pain · Narrative
You are a self-hoster running n8n or a similar WebSocket-dependent app behind an Nginx or Traefik reverse proxy on a non-standard port because your network or hosting constraints require it. Suddenly the UI goes blank or shows 'Connection lost' every few seconds. The logs say 'Invalid origin' but your environment variables look correct. You search online and find a dozen different fixes across blog posts, GitHub issues, and forum comments — each for a different proxy setup. You try them one by one, spending an entire night without success. One user even patched source code out of desperation. You wish there were a tool that looked at your actual config files and told you exactly which line to change.
Score Breakdown
Market Signal
Go-to-Market
Homelab enthusiasts and indie developers who self-host n8n, Home Assistant, or similar apps behind Nginx or Traefik on non-standard ports and hit WebSocket connection drops
~50K-80K active self-hosters who deploy behind reverse proxies with custom ports
Organic in self-hosting communities (self-hosting subreddits, GitHub issue discussions, HomelabOS/Docker communities) plus SEO for long-tail queries like 'n8n invalid origin websocket nginx custom port'
$9/month for the diagnostic SaaS, with a free tier that diagnoses one config per day
500 free users and 20 paying users within 30 days of launch in self-hosting communities
MVP Scope · 1–2 weeks
- Build the config paste-in parser for docker-compose + Nginx + env var blocks
- Create the rule engine with the top 10 WebSocket origin mismatch rules (port stripping, missing Origin header, missing Host rewrite, etc.)
- Build the corrected config snippet generator with syntax highlighting and copy-paste output
- Create a landing page with a live demo where users can paste a known-broken n8n+Nginx config and see the fix
- Write 5 SEO-optimized blog posts covering the most common proxy+port+app combinations as content marketing
- Add Traefik config parsing and the Traefik-specific origin header rules
- Add Caddy and Nginx Proxy Manager config parsing support
- Build a pre-deployment simulator that shows the expected Origin header and the app's expected value side-by-side
- Add app-specific knowledge entries for Home Assistant, Grafana, and code-server beyond n8n
- Launch in self-hosting communities with the free tier and collect the first 100 user configs for rule refinement
Differentiation
Why This Might Fail
Self-rebuttal — the most important trust signal
- 1Self-hosters are notoriously frugal and may use the free tier once, fix their config, and never return — the one-time-use nature of the tool limits recurring revenue.
- 2The problem may be fixed upstream: if n8n and other apps update their WebSocket origin validation to handle non-standard ports gracefully, the core pain point evaporates and the tool loses relevance.
- 3Scope creep risk: supporting every proxy software and every self-hosted app's quirks requires a massive knowledge base that a small team cannot maintain, leading to inaccurate diagnoses that erode trust.
Evidence Summary
How AI synthesized this insight — no verbatim quotes
Approximately 8 commenters in this discussion reported the identical WebSocket origin validation failure when running behind reverse proxies on non-standard ports. Users span Nginx, Traefik, Nginx Proxy Manager, and Cosmos Cloud setups, each requiring a different fix. One user spent an entire night debugging without success; another patched application source code directly. A referenced environment variable turned out to be a likely AI hallucination, underscoring the lack of reliable documentation. Multiple users confirmed community-sourced fixes worked, but only after extensive trial and error — strong evidence for a systematic diagnostic tool.
Action Plan
Validate this opportunity before writing code
Recommended Next Step
Build
Strong demand signals detected. Real pain, real willingness to pay — start building an MVP.
Landing Page Copy Kit
Ready-to-paste copy based on real Reddit community language — no editing required
Headline
Reverse Proxy Config Diagnostic & Fix Generator
Sub-headline
A web-based tool where users paste their docker-compose.yml, reverse proxy config (Nginx/Traefik/Caddy), and environment variables. The tool runs a rule engine that detects WebSocket origin mismatches, port stripping issues, and header forwarding gaps, then outputs corrected config snippets specific to their proxy software. Targets self-hosters who spend hours debugging deployment configs.
Who It's For
For Self-hosters and homelab operators deploying WebSocket-dependent applications (n8n, Home Assistant, Grafana, code-server) behind reverse proxies on non-standard ports, who lack DevOps expertise and spend hours on config debugging.
Feature List
✓ Paste-in config parser supporting docker-compose, Nginx, Traefik, Caddy, and env var blocks ✓ Rule engine detecting WebSocket origin/port mismatches, missing proxy headers, and env var inconsistencies ✓ Corrected config snippet generator with diff highlighting and copy-paste output ✓ App-specific knowledge base for n8n, Home Assistant, Grafana, code-server, and other WebSocket-heavy apps ✓ Pre-deployment dry-run simulator showing which headers the browser would send and how the app would validate them
Where to Validate
Share your landing page in r/GitHub · n8n-io/n8n — that's exactly where these pain points were discovered.
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