Lovable
deployment
CORS Error in Production Blocking Supabase Requests
API requests to Supabase fail with CORS error in production. 'Access-Control-Allow-Origin' header missing or not matching domain. Works locally but fails on deployed site.
CORS policy requires server to explicitly allow requests from client domain. Browser blocks cross-origin requests without proper headers.
Error Messages You Might See
Access-Control-Allow-Origin header is missing
CORS policy blocked request
The value of the Access-Control-Allow-Origin is not a match
Common Causes
- Supabase project not configured to allow production domain
- Using wrong domain in CORS settings (www vs non-www)
- Production domain not in Supabase allowed origins list
- Missing API key or using wrong key tier
- localhost still in allowed origins blocking production domain
How to Fix It
In Supabase dashboard > Project Settings > API > CORS config, add your production domain:
https://yourdomain.com
https://www.yourdomain.com
http://localhost:5173Use exact domains. Wildcards not allowed. Redeploy after updating.
Real developers can help you.
hanson1014
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I've scaled systems, automated deployments, and built observability tools for AI coding workflows. I specialize in taking vibe-coded apps from broken prototype to production-ready: fixing Supabase auth/RLS, Stripe integrations, deployment pipelines, and cleaning up AI-generated spaghetti.
I build tools in this space (agentprobe, claudebin, micode) and understand both sides: how AI generates code and why it breaks.
https://blog.vtemian.com/
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What I bring to AI-built apps:
- I audit and fix security issues (OWASP methodology), performance bottlenecks, and architectural problems in codebases generated by Cursor, Claude Code, Lovable, Bolt, and v0
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Tech stack: PHP 8.x, Symfony, React, Next.js, PostgreSQL, MySQL, Docker, AWS (ECS, RDS, S3, SQS/SNS, CloudFront), Terraform, Supabase. I also use AI tools daily (Claude Code, Cursor) in my own workflow, so I understand both the strengths and the gaps in AI-generated code.
Based in Poland (CET timezone). Available for async work and calls during EU/US business hours.
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Dor Yaloz
SW engineer with 6+ years of experience,
I worked with React/Node/Python
did projects with React+Capacitor.js for ios
Supabase expert
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Get HelpFrequently Asked Questions
Do I need CORS in development?
No, Supabase allows localhost origins by default. Only needed for production domains.
Should I use wildcard CORS?
No, specify exact domains for security. Supabase does not support wildcard origins.