APIs & Cloud
Read web requests, diagnose integrations and understand cloud service behavior.
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Web and API Foundations
Client, Server, Endpoint and API
Understand what a browser or app sends to a remote service.
HTTP Methods: GET, POST, PUT, PATCH, DELETE
Match request methods to intended operations and safe handling.
URLs, Headers, Parameters and Bodies
Read how an API request carries data and configuration.
JSON Responses and HTTP Status Families
Interpret common payload shapes and 2xx, 3xx, 4xx and 5xx results.
Working with Integrations
API Contracts and Schema Validation
Check required fields, types and response expectations.
API Authentication Flow Basics
Understand what a token or API credential is used for.
Webhooks and Event-Driven Requests
Trace events that send information between systems.
Pagination and Idempotency
Understand multi-page results and avoiding duplicate actions.
API Troubleshooting
401, 403, 404 and 409 Diagnostics
Distinguish login, permission, missing resource and conflict errors.
HTTP 429 and Rate Limits
Investigate excessive requests, quotas and Retry-After guidance.
Timeouts, 408, 502 and 503
Distinguish connection delays, gateways and temporary unavailability.
Retries, Backoff and Failure Recovery
Choose safe retry policies and avoid accidental duplicate operations.