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callcount

net/http.ResponseWriter.WriteHeader

standard library

The 169th most-called standard-library method by production calls. Called 27,900 times across 599 modules; 5,868 of those run outside tests and generated code.

1% in production calls vs 2026-W37 (5,806 → 5,868)

All of net/http → Docs on pkg.go.dev ↗

prod calls
5,868
non-test, non-generated
all calls
27,900
total callsites
modules
599
distinct callers
in loop
2%
of prod calls
in tests
74%
20,739 calls
resolved
0%
to a known target

resolution mix

How each call resolves

How each call was attributed. Only resolved kinds, where the target function is known, count toward the ranking. Interface dispatch and unresolved receivers are reported separately and never guessed. Read the taxonomy →

  • Embedded method<1%Reached through an embedded type.
  • Interface method100%Called through an interface. The runtime target may differ.

who calls this

Notable callers

Production calls into ResponseWriter.WriteHeader from notable Go projects. Open one on the map to see what else it hammers.

where it's called

Callsites in the wild

12 representative callsites of 27,900, prioritizing in-loop and non-test usage. We link to source, never display it.

ResponseWriter.WriteHeader · 12 of 27,900 callsites

top callers

The modules that reach for it

The modules that call ResponseWriter.WriteHeader most in this snapshot.

  • github.com/IBM/platform-services-go-sdk1,8797%
  • github.com/IBM/vpc-go-sdk1,7656%
  • github.com/IBM/networking-go-sdk1,6936%
  • github.com/gophercloud/gophercloud1,1174%
  • github.com/influxdata/telegraf1,0744%

siblings

More from net/http

The other most-called members in this package. See all →