Bombardier

Bombardier is an HTTP benchmarking CLI for load testing APIs and web services from the terminal. It sends concurrent requests against a target URL and summarizes latency, request rates, throughput, HTTP codes, and errors.

• Drive concurrent HTTP load against an endpoint for a fixed request count, test duration, or rate limit to check how an API or service behaves under pressure.
• Benchmark realistic requests with custom methods, headers, bodies, streamed bodies, TLS client certificates, and selectable fasthttp, HTTP/1.x, or HTTP/2 clients.
• Capture summary metrics in plain text, JSON, or a custom template for CI gates, regression checks, and side-by-side performance comparisons.

• Flags are non-interactive and script-friendly, so agents can drop it into deploy verification or benchmark loops without extra prompting.
• Machine-readable output is real but opt-in: -o json plus result-only printing yields parseable metrics for throughput, latency, status codes, and aggregated errors.
• Best for inspect-and-verify performance workflows; it generates load and reports outcomes, but agents need other tools to trace why a service slowed down or failed.

• Default output mixes intro and progress text with results, so automation should restrict printing when JSON is needed.
• The README documents a fasthttp limitation around setting the Host header correctly; use --http1 or --http2 when that matters.