nsc-events-fullstack_32_184-add-helmet

[NahomAlemu]

Summary & Changes 📃

• Resolves: Issue: Missing HTTP Security Headers (Helmet) #184

• Summary: Add Helmet middleware to secure HTTP response headers

  • 🔨 Fixes missing security headers that left the backend
    vulnerable to common web attacks (clickjacking, MIME-sniffing,
    XSS, etc.)
    • 👀 All API responses now include security headers:
      X-Content-Type-Options, X-Frame-Options,
      Strict-Transport-Security, X-XSS-Protection,
      Content-Security-Policy, and more
    • 🗨️ Helmet is applied as the first middleware before
      CORS/routing to ensure all responses are protected
  • Changes:
    • ✅ Installed helmet package
    • ✅ Added import helmet from 'helmet' in main.ts
    • ✅ Added app.use(helmet()) middleware
    • 🛠️ No breaking changes
    • 📝 Uses helmet defaults which are secure for most
      applications

  How to Test 🧪

  1. Steps to Reproduce:
  • Step 1: Start the server with npm run start
  • Step 2: Make any API request (e.g., curl -I http://localhost:3000/api)
  • Step 3: Inspect response headers
  2. Expected Behavior: Response includes security headers like
     X-Content-Type-Options: nosniff, X-Frame-Options: SAMEORIGIN,
     Strict-Transport-Security, etc.
  3. Actual Behavior (if bug): Previously, these headers were
     missing from all responses

Checklist ✅

• I have tested this PR locally and it works as expected.
• This PR resolves an issue (Resolves #issue-number).
• Reviewers, assignees(self), tags, and labels are correctly assigned.
• Squash commits and enable auto-merge if approved.

[github-actions]

🚀 E2E Smoke Test Results

Running smoke tests only (non-critical files changed)

Status	Count
✅ Passed	5
❌ Failed	0
📊 Total	5

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