oha is a command-line HTTP load generator with a real-time terminal user interface.
Written in Rust, it sends concurrent requests to web applications and presents live performance statistics during testing.
This is free and open source software.
Key Features
- Generates configurable HTTP workloads using a specified number of requests or test duration.
- Displays real-time statistics in an animated terminal user interface.
- Controls concurrency, HTTP/2 parallel requests, query rates and burst traffic.
- Supports HTTP/0.9, HTTP/1.0, HTTP/1.1, HTTP/2 and experimental HTTP/3.
- Sends custom methods, headers, request bodies and multipart form data.
- Supports basic authentication and AWS Signature Version 4 authentication.
- Works with HTTP proxies, Unix sockets and VSOCK connections.
- Provides IPv4, IPv6, TLS certificate and client certificate options.
- Generates variable target URLs from regular expressions or reads multiple URLs from a file.
- Exports results as text, JSON or CSV and can record successful requests in an SQLite database.
- Offers a faster non-interactive mode for tests that do not require the live interface.
- Runs on Linux, macOS and Windows.
Website: github.com/hatoo/oha
Support:
Developer: hatoo
License: MIT License

oha is written in Rust. Learn Rust with our recommended free books and free tutorials.
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Read our verdict in the software roundup.
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