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Question 31 of 100
Intermediate API Testing
Intermediate
Q31: What is the Difference Between Authentication and Authorization?
⚖️Core Concept
What is the Difference Between Authentication and Authorization?
Key Takeaways & Architecture Summary
- ✓Authentication confirms the identity of the client (Who are you?).
- ✓Authorization confirms the permissions of the identified client (What can you do?).
- ✓Auth failures yield HTTP 401 Unauthorized; Authz failures yield HTTP 403 Forbidden.
Direct Answer Summary
Authentication verifies client identity (e.g., logging in with credentials or tokens). Authorization checks the permissions of the verified client to ensure they are allowed to perform the requested operation. Failed authentication returns HTTP 401; failed authorization yields HTTP 403.
⚠️ Senior Engineering Warning (Red Flag)
Do not confuse HTTP status 401 with 403. A 401 status indicates that user credentials are invalid or missing. A 403 status indicates that user identity is verified, but they do not possess permissions to execute the action.
💡 STAR Architectural Explanation & Pro Tip
Testing access controls is critical. QA engineers perform role matrix testing by running the same API requests under different user roles to verify permission rules.
RestAssuredTest.java
Rest-Assured + Java// API Authorization Security Assertions
// ❌ Authentication Failure -> Expect 401
RestAssured.given().get("/api/v1/admin/dashboard").then().statusCode(401);
// ❌ Authorization Failure (User token accessing Admin route) -> Expect 403
RestAssured.given()
.header("Authorization", "Bearer standard_user_token")
.get("/api/v1/admin/dashboard")
.then().statusCode(403);