Q. What is an API gateway?
What the Interviewer Want to Know
They want to see that you understand an API gateway as a critical component in modern architectures that acts as a reverse proxy to manage, route, secure, and sometimes transform incoming API requests before they reach backend services while also handling cross-cutting concerns such as authentication, rate limiting, caching, and monitoring to simplify client interactions and optimize overall system performance.
How to Answer
When answering “What is an API gateway?” you should clearly define it as a server, explain its main roles in handling client requests, and describe its importance in managing, routing, and securing communication between clients and multiple backend services.
Structure it like this:
- Begin with a concise definition of an API gateway.
- Explain its role in routing requests to various services.
- Describe its function in managing and controlling access, including security, caching, and load balancing.
- Conclude with its importance in simplifying client interactions with microservices.
Example Answer
"An API gateway acts as the main entry point for client requests in a microservices architecture, handling tasks like routing, authentication, load balancing, and sometimes logging and caching. It simplifies client interactions by presenting a single interface instead of multiple service endpoints, which helps manage communication and scale applications more easily."
Common Mistakes
- Failing to mention that an API gateway acts as a reverse proxy, managing all API requests between clients and services.
- Confusing API gateway functionalities with general load balancing or other unrelated network components.
- Neglecting to discuss key features like security, rate limiting, caching, and request routing provided by an API gateway.
- Omitting the explanation of how it simplifies client interactions with multiple microservices by providing a single entry point.
- Overlooking the role of an API gateway in aggregating requests and responses from distributed services.
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