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Backend domain-management

Configure domain routing and DNS for sgcarstrends.com. Use when adding new services, updating domain patterns, or debugging DNS issues.

install
source · Clone the upstream repo
git clone https://github.com/sgcarstrends/sgcarstrends
Claude Code · Install into ~/.claude/skills/
T=$(mktemp -d) && git clone --depth=1 https://github.com/sgcarstrends/sgcarstrends "$T" && mkdir -p ~/.claude/skills && cp -r "$T/.claude/skills/domain-management" ~/.claude/skills/sgcarstrends-backend-domain-management && rm -rf "$T"
manifest: .claude/skills/domain-management/SKILL.md
source content

Domain Management Skill

This skill helps you manage domains and DNS configuration for the SG Cars Trends platform.

When to Use This Skill

  • Configuring custom domains in Vercel
  • Debugging domain resolution issues
  • Setting up redirects
  • Troubleshooting SSL/TLS errors

Domain Architecture

Domain Structure

sgcarstrends.com                    # Production web app
*.vercel.app                        # Preview deployments

DNS Provider: Vercel

Vercel handles DNS management with automatic SSL certificates.

Features:

  • Automatic SSL/TLS certificates
  • Global edge network
  • Fast DNS propagation
  • Built-in DDoS protection

Vercel Domain Configuration

Adding Custom Domain

  1. Go to Vercel Dashboard → Project Settings → Domains
  2. Add 
    sgcarstrends.com
  3. Follow DNS configuration instructions
  4. Vercel automatically provisions SSL certificate

DNS Records

Point your domain to Vercel:

Type    Name    Value
A       @       76.76.21.21
CNAME   www     cname.vercel-dns.com

Or use Vercel nameservers for full DNS management.

Debugging DNS Issues

Check DNS Propagation

# Check DNS resolution
dig sgcarstrends.com
dig @8.8.8.8 sgcarstrends.com

# Or use online tools
# https://www.whatsmydns.net/#A/sgcarstrends.com

Check SSL Certificate

# Check certificate details
openssl s_client -connect sgcarstrends.com:443 -servername sgcarstrends.com

# Check certificate expiry
echo | openssl s_client -connect sgcarstrends.com:443 2>/dev/null | openssl x509 -noout -dates

Test Domain Resolution

# Test HTTPS
curl -I https://sgcarstrends.com

# Test redirect (www → apex)
curl -I https://www.sgcarstrends.com

Common Issues

Issue: DNS not resolving Solutions:

  1. Check DNS records in Vercel dashboard
  2. Verify nameserver configuration
  3. Wait for propagation (usually < 5 minutes)

Issue: SSL certificate error Solutions:

  1. Check domain is verified in Vercel
  2. Wait for certificate provisioning (up to 24 hours)
  3. Check domain DNS points to Vercel

Issue: 404 on custom domain Solutions:

  1. Verify domain is added to correct project
  2. Check deployment is successful
  3. Verify build output

Security Headers

Configure in 

next.config.ts
:

const securityHeaders = [
  {
    key: "Strict-Transport-Security",
    value: "max-age=63072000; includeSubDomains; preload",
  },
  {
    key: "X-Frame-Options",
    value: "SAMEORIGIN",
  },
  {
    key: "X-Content-Type-Options",
    value: "nosniff",
  },
];

const nextConfig = {
  async headers() {
    return [
      {
        source: "/:path*",
        headers: securityHeaders,
      },
    ];
  },
};

References

Best Practices

  1. Use Apex Domain: 
    sgcarstrends.com
    for cleaner URLs
  2. HTTPS Only: Vercel enforces HTTPS automatically
  3. www Redirect: Configure www → apex redirect
  4. Monitor: Check Vercel dashboard for domain status