Why might adding custom response headers in a Spring Boot app affect CORS (Cross-Origin Resource Sharing) behavior?

hard📝 Conceptual Q10 of 15

Spring Boot - Request and Response Handling

ABecause headers are ignored in CORS requests

BBecause custom headers change the HTTP method automatically

CBecause Spring Boot disables headers by default

DBecause browsers block responses with unknown headers unless allowed by CORS policy

Step-by-Step Solution

Solution:

Step 1: Understand CORS header restrictions
Browsers enforce CORS policies that restrict which headers can be accessed by client scripts.
Step 2: Recognize need to whitelist custom headers
Custom headers must be explicitly allowed in Access-Control-Allow-Headers response header to avoid blocking.
Final Answer:
Because browsers block responses with unknown headers unless allowed by CORS policy -> Option D
Quick Check:
CORS requires allowing custom headers explicitly [OK]

Quick Trick: Allow custom headers in CORS config to avoid browser blocking [OK]

Common Mistakes:

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