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oha

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description oha Overview

Opa is an open-source, Node.js based tool that analyzes website performance by measuring various metrics like First Contentful Paint, Largest Contentful Paint, and Time to Interactive, providing insights into potential optimization opportunities for faster loading speeds.

help oha FAQ

What is oha used for?

oha is a command-line HTTP load generator written in Rust. It sends requests to a target URL and reports results such as throughput, latency, and error counts.

Is oha a browser performance tool that measures Largest Contentful Paint?

No. oha measures HTTP request behavior and does not render a page like Chrome, so it does not directly measure browser metrics such as Largest Contentful Paint or First Contentful Paint.

How is oha related to ApacheBench?

Both tools generate HTTP requests for benchmarking, but oha provides modern output and concurrency options in a Rust-based command-line program. ApacheBench is the older ab utility commonly distributed with Apache HTTP Server.

Can oha test an API endpoint instead of a full website?

Yes. An API URL is a normal target for oha, making it useful for measuring response latency under concurrent requests. The test should be run only against systems where load testing is authorized.

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