rhttp v0.1.0 — resilient HTTP client, zero dependencies

First public release of rhttp: a production-grade HTTP client for Go with built-in resiliency patterns and zero dependencies — Go standard library only.

Highlights

• Middleware architecture — every capability is an http.RoundTripper decorator, composed with New(WithMiddleware(...)). Writing your own middleware is a one-liner with the exported RoundTripperFunc.
• Resiliency — Timeout, Retry with pluggable backoff, CircuitBreaker (single-probe half-open, generation-gated state machine), and RateLimit (token bucket).
• Retry-After aware — backoff strategies receive the response that triggered the retry; the WithRetryAfter decorator honors the Retry-After header (delay-seconds or HTTP-date) on 429/503.
• Shared circuit state — NewCircuitBreaker lets several clients trip together against the same dependency, with observable State().
• Observability — Logging and Metrics middleware; PathNormalizer bounds metrics label cardinality.
• Fluent builder — client.R() with JSON/XML/form/reader bodies, path and query parameters. Bodies up to 10 MB are buffered so retries can rewind them; larger bodies stream and are sent exactly once.
• Error classification — Classify, IsRetryable, IsTimeout, IsConnection and friends, plus the opinionated DecodeJSON helper.

Performance

Measured 2026-07-25 (linux/amd64, i7-1255U, min of 5 runs; see the README for methodology and caveats):

	ns/op	allocs/op
Full middleware stack (no-op transport)	1030	13
As a wrapper vs equivalently configured competitors	910	12
net/http floor (timeout only, no retry)	1750	26
Rate limiter check	48	0
Backoff strategies	<10	0

Loopback numbers amplify relative differences — against a real network (0.5–500 ms) every client performs the same for practical purposes. Full tables and reproduction steps: benchmarks/REPORT.md.

Quality

• 95.2% statement coverage on the root package; race-clean suite across Go 1.21–1.23 in CI.
• Middleware interaction semantics (timeout budgets, per-attempt deadlines, breaker cutting retries) pinned by tests.

Install

go get github.com/oswaldom-code/rhttp@v0.1.0

Full changelog: CHANGELOG.md