Changelog

Reduced per-request allocations and CPU across the pkg/gofr request lifecycle, closing most of the gap to the net/http router cluster.

Benchmark setup: Apple M4, GOMAXPROCS=4, payloads: plaintext (13 B), json (small object), param (single path param). Numbers are machine-specific and will differ on Linux/x86, in containers with CPU limits, and at higher core counts — treat as relative, not absolute.

End-to-end RPS (vs v1.56.6):

| Endpoint | v1.56.6 | v1.56.7 | Δ |

|-----------|--------:|---------:|-------:|

| plaintext | 89,835 | 133,304 | +48 % |

| json | 89,177 | 118,513 | +33 % |

| param | 87,224 | 121,159 | +39 % |

Per-request profile (pprof):

| Metric | v1.56.6 | v1.56.7 | Δ |

|-------------------------|--------:|--------:|------:|

| Allocations / req | 132 KB | 60 KB | −54 % |

| CPU / req | 33.5 µs | 21 µs | −37 % |

| p99 latency (plaintext) | 3.7 ms | 1.7 ms | −54 % |

What changed

| Area | Change | Impact |

|------|--------|--------|

| OTel hot path | When TRACE_EXPORTER is unset, installs a NeverSample() TracerProvider; otel.Tracer(...) handle cached in the middleware closure | Spans keep unique TraceID/SpanID for log correlation but short-circuit at the sampler — 528 B → 144 B / req |

| Middleware | StatusResponseWriter shared between Logging and Metrics and pooled; attribute slices cached per (route, method); time.Now() deferred past probe/GraphQL filters | Fewer allocations per request |

| Response & routing | Single Write with a Content-Length header (was 2–3 Writes); path.Clean skipped on already-canonical URLs; handler runs inline (no goroutine) when there's no request timeout and the request isn't a WebSocket upgrade | Lower CPU and allocations on the response path |

Tracing spans

HTTP semconv attributes (http.method, http.route, http.status_code) are now recorded natively on the request span, and the redundant per-route otelhttp.NewHandler wrap has been removed.

> Note on tracing defaults: the NeverSample() provider only applies when TRACE_EXPORTER is unset — i.e. when tracing isn't configured at all. If you set TRACE_EXPORTER, sampling and export behave as before. No configured setup is affected.

Full Changelog: https://github.com/gofr-dev/gofr/compare/v1.56.6...v1.56.7