HTTP Benchmarking Tool CLI

I'll help you create a comprehensive HTTP benchmarking tool in Go. The implementation will feature a concurrent request engine using goroutines and channels, with configurable worker pools for precise thread control. Key components include: a statistics collector tracking p50/p95/p99 latencies using histograms, multi-protocol support via http.Client with custom transports for HTTP/2 and quic-go for HTTP/3, a templating system using text/template for dynamic payloads, regex-based response validators, flexible TLS configurations, and a phased load controller supporting ramp-up periods. The distributed mode will use gRPC for coordination across test nodes.

I'd be happy to outline this benchmarking tool, though I should note some complexities. The core architecture would use Go's concurrency primitives (goroutines, sync.WaitGroup) for request generation, with x/net/http2 for HTTP/2 and lucas-clemente/quic-go for HTTP/3 support. For accurate statistics, you'll want hdrhistogram for latency percentiles rather than simple averaging. The distributed mode is non-trivial—you'll need consensus on timing and result aggregation, potentially using etcd or a custom coordinator. I can provide a modular implementation starting with the core engine, but production-grade distributed testing requires careful consideration of clock synchronization and network overhead.

A Go-based HTTP benchmarking tool would leverage the net/http package with custom transports for protocol support (golang.org/x/net/http2 for HTTP/2, quic-go library for HTTP/3). Key implementation: Use worker pools with sync.WaitGroup for concurrency, hdrhistogram-go for accurate latency percentiles, and time.Ticker for load profile phases. For distributed testing, implement a coordinator service using gRPC that synchronizes worker nodes and aggregates metrics. Response validation can use regexp.Compile for pattern matching and configurable status code checks with early exit on failure conditions.