API Technologies · API Gateways
Apache APISIX — Free Learning Resources
Free, printable resources for Apache APISIX — practice problems, quick-reference cheatsheet, and an interview prep sheet. No sign-up required.
Apache APISIX — Practice Worksheet
Structured exercises and problems to build hands-on Apache APISIX skills. Work through key concepts step by step.
Apache APISIX — Cheatsheet
One-page quick-reference for Apache APISIX — key syntax, commands, patterns, and best practices at a glance.
Apache APISIX — Interview Sheet
Top Apache APISIX interview questions with concise answers. Get ready for any technical round with this focused prep sheet.
About Apache APISIX
Apache APISIX is an API technology or protocol for communication between services and clients. Modern applications rely on well-designed APIs for frontend-backend communication, microservices integration, and third-party data exchange.
Apache APISIXCheat Sheet — What's Covered
- ✓Apache APISIX core concepts, data format, and communication model
- ✓Authentication patterns — API keys, OAuth2, JWT, and mTLS
- ✓Request/response structure, status codes, and error handling
- ✓Versioning strategies and backwards compatibility
- ✓Rate limiting, caching, and performance optimization
Frequently Asked Questions — Apache APISIX
What is Apache APISIX and what are its primary use cases?
Apache APISIX defines how systems exchange data and trigger actions. It specifies the contract between producer and consumer — what operations exist, what format requests take, and how errors are communicated. It's used for powering frontends, microservice communication, and third-party integrations.
How do you version an API?
Common strategies: URL path (/v1/users), request header (Accept: application/vnd.api+json;version=2), or query parameter (?version=2). URL versioning is the most discoverable. Keep old versions until clients migrate; deprecate with clear sunset dates in headers and documentation.
How should API error responses be structured?
Return a consistent error body: HTTP status code, a machine-readable error code for programmatic handling, a human-readable message, and optional context. Never expose stack traces. Document all possible error codes in your API reference.
How do you secure an API?
Use OAuth2 with bearer tokens (JWT) for user-facing APIs. Use API keys for server-to-server integrations. Always use HTTPS. Implement rate limiting to prevent abuse. Validate and sanitize all input. Never trust client-supplied data without server-side verification.
What is rate limiting and why is it important?
Rate limiting restricts how many requests a client can make in a time window, preventing DoS attacks and protecting backend resources. Return 429 Too Many Requests with a Retry-After header. Implement per-user and per-IP limits. Use a distributed counter (Redis) for multi-instance deployments.
Who Is This For?
Backend developers and API designers building or consuming APIs who need a quick reference for Apache APISIX patterns, conventions, and tooling.