httptrace is one of those packages that ships with Go that more people should know about. It's in...
Go's `net/http/httptrace` attaches synchronous hooks to measure latency across HTTP phases (DNS, TCP, TLS, request write) without external dependencies. Essential for diagnosing API client bottlenecks in production; reveals whether delay is in DNS/TCP/TLS and identifies connection reuse failures in high-volume scenarios.
httptrace is one of those packages that ships with Go that more people should know about. It's in net/http/httptrace and it gives you visibility into every phase of an HTTP request — DNS lookup, TCP connection, TLS handshake, and the actual request — without adding any external dependencies.
The setup
You attach a *httptrace.ClientTrace to a request context. Go calls the relevant hook as each phase completes. Here's a minimal example that just prints timestamps:
package main
import (
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