ADevGuide Web Fundamentals
Networking and browser basics that explain how the modern web works from DNS to HTTP and TLS.
Explore subtopics:
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How DNS Works: Complete Beginner Explanation
Series: Internet and Web Foundations Series
Learn how DNS works from browser query to authoritative answer, including records, caching, TTL, and practical troubleshooting steps.
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What Happens When You Type a URL? Step-by-Step Explained
Series: Internet and Web Foundations Series
Understand what happens when you type a URL: browser parsing, DNS lookup, TCP/TLS handshakes, HTTP flow, rendering, and debugging tips.
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Authentication vs Authorization: Backend Interview Guide
Series: Backend Interview Mastery
Master authentication vs authorization for backend interviews, including 401 vs 403, sessions, JWTs, API checks, and permission models.
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How JWT Works: Header, Payload, Signature and Security
Series: Backend Interview Mastery
Learn how JWT works for backend interviews: header, payload, signature, expiry, validation, key rotation, and API security pitfalls.
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HTTP Methods: GET vs POST vs PUT vs PATCH vs DELETE
Series: Backend Interview Mastery
Master HTTP methods for backend interviews: GET, POST, PUT, PATCH, and DELETE semantics, retries, caching, and API design trade-offs.
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HTTP Status Codes Explained: 200, 404, 500 and More
Series: Backend Interview Mastery
Master HTTP status codes for backend interviews: 200, 201, 400, 401, 403, 404, 409, 429, 500, and 503 with API examples.
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What Is CORS? Backend Guide to Preflight and Security
Series: Backend Interview Mastery
Learn what CORS is for backend interviews: browser origins, preflight requests, credential rules, safe headers, and production debugging.
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What Is a REST API? Principles, Examples and Interview Questions
Series: Backend Interview Mastery
What is a REST API? Learn resource design, HTTP semantics, idempotency, and the interview answers backend engineers need.
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Client-Server Architecture Explained for Backend Interviews
Series: Backend Interview Mastery
Learn client-server architecture for backend interviews: request flow, tiers, state, scaling trade-offs, and production failure points.
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REST API Error Handling Best Practices: Beginner Guide
Series: API and Backend Basics Series
Master REST API error handling with best practices for status codes, consistent payloads, retries, observability, and secure production APIs.