Recognize and interpret essential integration concepts and terminology20% of the exam
HTTP methods, status codes and REST constraints
How a RESTful API uses HTTP: methods mapped to create, read, update and delete, URI parameters, query parameters and headers, the status codes that report success or failure, and the six REST constraints such as statelessness and cacheability.
Identify and describe the HTTP components that enable RESTful web services.
~6 min read · 4 practice questions ·
What the exam expects
- Pick the HTTP method that matches a create, read, update, partial update or delete requirement.
- Read a request line: resource path, URI parameter, query parameter, headers and body.
- Interpret common status codes (200, 201, 400, 401, 404, 500) and say whether the client or the server must act.
- Name the six REST constraints and recognize a design that breaks statelessness or cacheability.
Key terms:
- REST: Representational State Transfer, an architectural style of design constraints that usually runs over HTTP.
- Resource and URI: the data a REST API exposes, each piece reached through a Uniform Resource Identifier.
- URI parameter: a path segment that identifies one specific resource.
- Query parameter: a name-value pair after the
?that refines the request. - Statelessness: the server keeps no session information about the client between requests.
Key facts
PUT vs PATCH
- Detail
- PUT replaces the whole resource; PATCH modifies specific fields
POST success
- Detail
- 201 Created
Missing required body field
- Detail
- 400 Bad Request
Missing credentials
- Detail
- 401 Unauthorized
Missing resource
- Detail
- 404; reserve 500 for server crashes
Mocking service
- Detail
- Returns example success responses, even for incomplete requests
Optional REST constraint
- Detail
- Code-on-demand is the only one
Where state lives in REST
- Detail
- On the client, never the server
Preferred payload format
- Detail
- JSON
- Why does REST put the action in the HTTP method rather than in the path?
- When does APIkit's generated error handling return 405?
- Why does statelessness make horizontal scaling simple?
- Which REST constraint lets an API gateway sit between client and server unnoticed?
The questions are free to read. Answers with their sources and self-grading are included with the pack.
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