Question 1

How do I set up HTTP caching with undici?

Accepted Answer

Use the cache interceptor with an Agent, configure a store like MemoryCacheStore for size limits, and set it as the global dispatcher to automatically cache responses based on Cache-Control headers, as shown in the README examples.

Question 2

Undici vs axios: which should I use?

Accepted Answer

Undici is faster and offers more low-level control, ideal for performance-critical apps, while axios provides more features out-of-the-box like interceptors and easier error handling, better for rapid development.

Question 3

Can undici handle HTTP/2 requests?

Accepted Answer

No, undici is designed for HTTP/1.1 only. For HTTP/2, consider using Node.js's native http2 module or libraries like node-http2, as undici focuses on optimizing HTTP/1.1 performance.

Question 4

How to replace node-fetch with undici?

Accepted Answer

Import fetch from undici and use it similarly, but note undici's fetch has better performance and advanced options like custom dispatchers; however, watch for differences in error handling and body consumption requirements.

Question 5

What's the performance difference between undici.fetch and Node's built-in fetch?

Accepted Answer

Undici.fetch uses the latest undici version with optimizations and more control, while built-in fetch is bundled with Node.js and may have performance overhead due to Web Streams; benchmarks show undici.request is the fastest option.

Question 6

How to avoid connection leaks in undici?

Accepted Answer

Always consume the response body using methods like .json() or .dump(), or cancel it if unused, to prevent resource exhaustion, as highlighted in the garbage collection section of the README.

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