1. Explain about CORS? 2. Explain about REST API Versioning 3. Convert loops into Java 8 Streams. 4. List vs Set 5. Runnable vs Callable 6. Checking palindrome of a String which contains special characters. 7. Maximum subarray sum. 8. Uber system design

Question

Accepted Answer

CORS is a security feature that allows or restricts web applications from making requests to different domains.

Cross-Origin Resource Sharing (CORS): A mechanism that allows restricted resources on a web page to be requested from another domain outside the domain from which the first resource was served.
HTTP Headers: CORS uses HTTP headers to tell browsers to give a web application access to resources from a different origin. Key headers include 'Access-Control-Allow-Origin'.
Preflight Requests: For certain types of requests (like PUT or DELETE), browsers send a preflight request using the OPTIONS method to check if the actual request is safe to send.
Security Implications: CORS is crucial for web security, preventing malicious sites from accessing sensitive data from another domain.

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1. Explain about CORS? 2. Explain about REST API Versioning 3. Convert loops into Java 8 Streams. 4. List vs Set 5. Runnable vs Callable 6. Checking palindrome of a String which contains special characters. 7. Maximum subarray sum. 8. Uber system design

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