API / APIGEE Gateway Interview Questions
What is an API proxy in Apigee and what are its main components?
An API proxy is the primary unit of deployment in Apigee. It creates an abstraction layer between API consumers and backend services, so backend URLs, authentication schemes, and data formats can change without affecting consumers. Every request from a client hits the proxy first; the proxy applies policies, then forwards to the backend.
| Component | Description |
|---|---|
| ProxyEndpoint | The client-facing endpoint: defines the URL clients call, the HTTP verbs accepted, and the flows that execute on incoming requests |
| TargetEndpoint | The backend-facing endpoint: defines where Apigee forwards the request after applying PreFlow/PostFlow policies |
| Flows | Ordered sequences of policy steps: PreFlow, ConditionalFlows, PostFlow |
| Policies | Reusable, declarative processing steps (XML) attached to flow steps |
| Resources | JavaScript, Java, Python, XSLT, or other files used by callout policies |
| API Bundle | The ZIP archive containing all proxy configuration files, deployed to an environment |
<!-- Simplified proxy structure --> apigee-proxy/ apiproxy/ my-proxy.xml <!-- root proxy descriptor --> proxies/ default.xml <!-- ProxyEndpoint definition --> targets/ default.xml <!-- TargetEndpoint definition --> policies/ VerifyAPIKey.xml Quota.xml AssignMessage.xml resources/ jsc/ transform.js
A proxy is deployed to an environment (such as test or prod). The same proxy bundle can be deployed to multiple environments with environment-specific configuration, enabling a standard test-to-production promotion workflow.
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