name: effect-facet-unstable-http-core description: Guidance for facet effect/unstable/http#core focused on APIs like Etag, Cookies, and Headers. Load after effect-skill-router when this facet is the primary owner.

Effect Facet unstable/http#core

Owned scope

• Owns only effect/unstable/http#core.
• Parent module: effect/unstable/http.

What it is for

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

API quick reference

• Etag
• Cookies
• Headers
• HttpBody
• Template
• FindMyWay
• Multipart
• UrlParams
• HttpClient
• HttpEffect
• HttpMethod
• HttpRouter
• HttpServer
• Multipasta
• HttpPlatform
• FetchHttpClient
• HttpClientError
• HttpClientRequest
• Full API list: references/api-reference.md

How to use it

• Keep work focused on the core concern for effect/unstable/http.
• Keep runtime/execute APIs at edges; compose pure transformations before execution.
• Assume unstable APIs can evolve quickly; isolate usage behind thin local adapters.

Starter example

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

const value = http.Etag();

Common pitfalls

• Concurrency helpers can hide ordering/cancellation behavior; test interruption and race paths.
• Unstable module contracts may change; avoid coupling core app logic directly to experimental details.

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-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)
  • effect-facet-unstable-http-httpmethod (effect/unstable/http/HttpMethod)
  • 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

• 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