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What is the primary role of the helmet middleware in a NestJS application?

easy📝 Conceptual Q1 of 15
NestJS - Middleware
What is the primary role of the helmet middleware in a NestJS application?
ATo enhance security by setting various HTTP headers
BTo enable cross-origin resource sharing
CTo parse incoming JSON requests
DTo manage session cookies
Step-by-Step Solution
Solution:
  1. Step 1: Understand Helmet's purpose

    Helmet is a middleware designed to improve security by setting HTTP headers that protect against common vulnerabilities.
  2. Step 2: Compare with other middleware roles

    CORS handles cross-origin requests, JSON parsing is done by body-parser, and session cookies are managed by session middleware, not Helmet.
  3. Final Answer:

    To enhance security by setting various HTTP headers -> Option A
  4. Quick Check:

    Helmet = Security headers [OK]
Quick Trick: Helmet sets security headers, not CORS or parsing [OK]
Common Mistakes:
  • Confusing Helmet with CORS middleware
  • Thinking Helmet parses request bodies
  • Assuming Helmet manages sessions

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