effect-facet-unstable-http-httptracecontext

name: effect-facet-unstable-http-httptracecontext description: Guidance for facet effect/unstable/http/HttpTraceContext focused on APIs like fromHeaders, FromHeaders, and b3. Load after effect-skill-router when this facet is the primary owner.

Effect Facet unstable/http/HttpTraceContext

Owned scope

• Owns only effect/unstable/http/HttpTraceContext.
• Parent module: effect/unstable/http.
• Source anchor: packages/effect/src/unstable/http/HttpTraceContext.ts.

What it is for

• Module-specific APIs and usage patterns for Effect programs.

API quick reference

• fromHeaders
• FromHeaders
• b3
• w3c
• xb3
• toHeaders
• Full API list: references/api-reference.md

How to use it

• Start with constructor-style APIs to build values/services before composing operations.
• Assume unstable APIs can evolve quickly; isolate usage behind thin local adapters.
• Use the reference docs to select the smallest API surface that solves your task.
• Validate behavior against existing tests before introducing new usage patterns.

Starter example

import { HttpTraceContext } from "effect/unstable/http/HttpTraceContext";

const value = HttpTraceContext.fromHeaders();

Common pitfalls

• Unstable module contracts may change; avoid coupling core app logic directly to experimental details.
• Prefer explicit, typed combinators over ad-hoc casting or unchecked assumptions.

Not covered here

• Sibling facets under the same parent are out of scope:
  • effect-facet-unstable-http-client-impl (effect/unstable/http#client-impl)
  • effect-facet-unstable-http-cookies (effect/unstable/http/Cookies)
  • effect-facet-unstable-http-core (effect/unstable/http#core)
  • effect-facet-unstable-http-etag (effect/unstable/http/Etag)
  • effect-facet-unstable-http-fetchhttpclient (effect/unstable/http/FetchHttpClient)
  • effect-facet-unstable-http-findmyway (effect/unstable/http/FindMyWay)
  • effect-facet-unstable-http-headers (effect/unstable/http/Headers)
  • effect-facet-unstable-http-httpbody (effect/unstable/http/HttpBody)
  • effect-facet-unstable-http-httpclient (effect/unstable/http/HttpClient)
  • effect-facet-unstable-http-httpclienterror (effect/unstable/http/HttpClientError)
  • effect-facet-unstable-http-httpclientrequest (effect/unstable/http/HttpClientRequest)
  • effect-facet-unstable-http-httpclientresponse (effect/unstable/http/HttpClientResponse)
  • effect-facet-unstable-http-httpeffect (effect/unstable/http/HttpEffect)
  • effect-facet-unstable-http-httpincomingmessage (effect/unstable/http/HttpIncomingMessage)
  • plus 16 additional sibling facets.
• Parent module ownership belongs to effect-module-unstable-http.

Escalate to

• effect-module-unstable-http for parent module-wide workflows.
• effect-skill-router for cross-module routing and ownership checks.

Reference anchors

• Facet source: packages/effect/src/unstable/http/HttpTraceContext.ts
• Parent tests: packages/effect/test/unstable/http/Cookies.test.ts
• Parent tests: packages/effect/test/unstable/http/Headers.test.ts
• Parent tests: packages/effect/test/unstable/http/HttpClientRequest.test.ts
• Parent tests: packages/effect/test/unstable/http/HttpEffect.test.ts
• Parent tests: packages/effect/test/unstable/http/Multipart.test.ts
• Parent tests: packages/effect/test/unstable/http/UrlParams.test.ts
• API details: references/api-reference.md
• Usage notes: references/usage-reference.md
• Ownership mapping: references/owner.md