CFG-007high SeveritySecurity Misconfiguration & Headers
No Hardcoded "localhost" URLs in Production Code
Agents hardcode fetch("http://localhost:3000/api/...") during local testing and forget to replace it with dynamic environment variables.
1-Click Fix Prompt for Cursor & Claude Code
Review my codebase for "No Hardcoded "localhost" URLs in Production Code" (CFG-007).
Issue: Agents hardcode fetch("http://localhost:3000/api/...") during local testing and forget to replace it with dynamic environment variables.
Remediation required: Replace all localhost strings in API calls with relative paths (/api/...) or process.env.NEXT_PUBLIC_API_URL.
Please:
1. Locate any occurrences of this issue across my repository.
2. Refactor the code to follow production standards without breaking existing functionality.
3. Provide a clear command or step to test and verify the fix.Why AI Assistants Write This Bug
Agents hardcode fetch("http://localhost:3000/api/...") during local testing and forget to replace it with dynamic environment variables.
AI code generation prioritizes immediate syntax execution over production edge cases. When an assistant hits an undefined variable or strict type error, it frequently takes the path of least resistance rather than implementing standard pre-launch security patterns.
Code Comparison
Common AI Code PatternVulnerable
// Vulnerable AI-generated pattern for: No Hardcoded "localhost" URLs in Production Code
// Problematic pattern: Agents hardcode fetch("http://localhost:3000/api/...") during local testing and forget to replace it with dynamic environment variables.Launch-Ready Fix
// Production-ready fix for: No Hardcoded "localhost" URLs in Production Code
// Recommended remediation: Replace all localhost strings in API calls with relative paths (/api/...) or process.env.NEXT_PUBLIC_API_URL.Remediation & Verification Checklist
Remediation: Replace all localhost strings in API calls with relative paths (/api/...) or process.env.NEXT_PUBLIC_API_URL.
- Search your codebase for pattern matching "No Hardcoded "localhost" URLs in Production Code".
- Apply the recommended remediation: Replace all localhost strings in API calls with relative paths (/api/...) or process.env.NEXT_PUBLIC_API_URL.
- Run local build and test commands to ensure no regressions.
- Verify in your browser or with curl that the issue is resolved.
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