HTTP Status Codes: Interview Guide

Published by SoftwareTestPilot

PDF • 13 pages • Interview Guide • Beginner • API Testing

Published 3 November 2026 • Updated 3 November 2026

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A 13-page interview guide covering start with the meaning, then test the outcome, 200 ok, 201 created, 204 no content.

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Overview

This guide covers eight essential HTTP status codes—200, 201, 204, 400, 401, 403, 404, and 500—using a consistent fictional order service to illustrate realistic API testing scenarios. It explains protocol response semantics, distinctions between API contracts and HTTP results, and the critical checks testers must execute beyond merely verifying the status code. Readers examine detailed breakdowns of headers, payload requirements, permissions, and server state side effects. Designed for quality assurance engineers preparing for technical interviews, this resource equips practitioners with sample interview questions, common candidate mistakes, and concrete verification rules. It helps testers evaluate edge cases such as empty search collections, token validation issues, soft deletions, and unhandled server-side exceptions.

What you'll learn

Differentiate HTTP protocol response semantics from documented API contract behavior.
Verify response headers, data representations, permissions, and resulting business state.
Validate successful resource creations using 201 and optional Location headers.
Confirm successful deletions return 204 without message bodies or Content-Length.
Distinguish malformed request syntax under 400 from specific codes like 415 or 422.
Differentiate missing authentication credentials under 401 from permission refusals under 403.
Investigate unexpected 500 errors for partial side effects and sensitive implementation leaks.

Topics covered

http status codes
api testing
401 vs 403
interview questions
rest api

Start with the meaning, then test the outcome
200 OK
201 Created
204 No Content
400 Bad Request
401 Unauthorized
403 Forbidden
404 Not Found
500 Internal Server Error

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Start with the meaning, then test the outcome

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Skills covered

API Testing
HTTP Status Codes
Interview Preparation

Who this resource is for

QA Engineers
Software Testers

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A downloadable PDF you can read on phone or laptop.
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