Explain how to make robust HTTP API calls

Q: Explain how to make robust HTTP API calls

This question evaluates understanding of robust HTTP API integration, covering reliability and resilience topics such as timeouts, retries and backoff, idempotency, authentication and headers, rate limiting, pagination, and observability in high‑QPS client-service interactions.

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SWE Fundamentals: Making Robust HTTP Calls (Client/Service)

You need to integrate with an external HTTP API (could be an internal microservice or a third-party service). The call is on the critical path of a user request.

Prompt

Explain how you would implement this HTTP integration robustly:

Which HTTP method(s) you would use and why
Timeouts (connect/read), retries, and backoff
Which failures are retryable vs not
Authentication and headers
Rate limiting and pagination
Observability (logging/metrics/tracing)
How you would avoid duplicate side effects (idempotency)

Assume high QPS and that the external API can be slow or intermittently failing.

Explain how to make robust HTTP API calls

Quick Overview

SWE Fundamentals: Making Robust HTTP Calls (Client/Service)

Prompt

Solution

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