BackendPrep
All Interview Packs/Topic-Based/HTTP Protocols & API Architecture Pack
Topic-BasedIntermediateFree Track

HTTP Protocols & API Architecture Pack

HTTPS handshake packet flow, safe/idempotent methods, CORS, RFC 7807 error schemas, rate limiting, and gRPC vs REST.

APIs are the contract between systems. Senior backend interviews rigorously test candidate comprehension of the protocol layer: how HTTPS packets traverse the network, why PUT is idempotent while POST is not, how browsers enforce CORS preflight OPTIONS requests, and how to build deterministic rate limiters using Token Bucket algorithms.

Target AudienceAll backend engineers preparing for API design, network protocol, and systems contract rounds.
Targeted Companies
StripeTwilioCloudflareGitHubAWS
2 WeeksPlan Duration
2Curriculum Modules
15Curated Questions
4Milestones

Sign in to unlock full HTTP Protocols & API Architecture PackFree Account

Create a free account to unlock all 2 modules, track your question completions, save revision bookmarks, and verify your interview readiness.

Structured Syllabus

Curriculum Modules (Preview Mode)

Module 01 is previewable. Sign in to unlock full questions, failure modes, and revision tracking.

01

Protocol Fundamentals: TCP, TLS 1.3 & HTTP Methods

Free Preview

Packet lifecycle, 3-way handshake, TLS resumption, status codes, and idempotency.

~6h
Target Competency & Objective:Understand the lower protocol layers beneath your application code and master HTTP method semantics and status codes.

Core Technical Concepts Tested

DNS resolution -> TCP 3-way handshake (SYN, SYN-ACK, ACK) -> TLS 1.3 HandshakeSafe (GET, HEAD) vs Idempotent (PUT, DELETE) vs Neither (POST)Status code semantics: 201 Created vs 204 No Content, 400 vs 422, 401 vs 403RFC 7807 Problem Details for consistent machine-readable error schemas
What Fails in Production (Triage Scenarios):
  • Retrying non-idempotent POST requests causing duplicate orders or charges
  • Returning 200 OK with { error: 'failed' } payload breaking downstream API gateways
  • High connection latency caused by missing TLS session resumption (0-RTT)

Module Milestones (0 / 2)

Sign in to track milestones
02

Security, CORS, Pagination & Distributed Rate Limiting

CORS preflight, JWT vs sessions, cursor pagination, and Token Bucket algorithms.

~7h

Module 02 Content is Locked

Sign in with a free account to unlock all 10 curated questions, failure triage scenarios, quizzes, and milestone tracking.

Unlock Full Preparation Pack

Join thousands of backend engineers. Sign in to unlock all 2 modules, save question solutions, and track your revision queue.

Free Account • Instant Access

Module Outline

01. Protocol Fundamentals: TCP, TLS 1.3 & HTTP MethodsPreview02. Security, CORS, Pagination & Distributed Rate LimitingLocked

Specific Pack Deliverables

  • Tracing the complete network packet lifecycle from client browser to backend socket
  • Designing deterministic, idempotent API contracts with RFC 7807 problem details
  • Mastery of browser CORS security, preflight requests, and authorization headers
  • Implementing Token Bucket, Leaky Bucket, and Sliding Window rate limiting algorithms
Looking for other preparation tracks?Explore All Packs