golang.org/x/net v0.0.0-20180724234803-3673e40ba225: ctxhttp.Get

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify golang.org/x/net/context/ctxhttp.Get in pkg:golang/golang.org/x/net@v0.0.0-20180724234803-3673e40ba225
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/net@v0.0.0-20180724234803-3673e40ba225
Demonstrate these symbols/APIs:
  - golang.org/x/net/context/ctxhttp.Get

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:a0fe6138cf9ae7f19eaebf021eb4aae0af9cb14b486e23a69e88613e931a0817","contract":["ctxhttp.Get sends an HTTP GET request using the supplied context and http.Client and returns a 200 response with the expected body","ctxhttp.Get returns a non-nil error when called with an already-canceled context"],"goal":"verify golang.org/x/net/context/ctxhttp.Get in pkg:golang/golang.org/x/net@v0.0.0-20180724234803-3673e40ba225","kind":"HOW","packages":["pkg:golang/golang.org/x/net@v0.0.0-20180724234803-3673e40ba225"],"schemaVersion":1,"symbols":["golang.org/x/net/context/ctxhttp.Get"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/golang.org/x/net@v0.0.0-20180724234803-3673e40ba225"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/net@v0.0.0-20180724234803-3673e40ba225","symbols":["golang.org/x/net/context/ctxhttp.Get"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.21

require golang.org/x/net v0.0.0-20180724234803-3673e40ba225

golang.org/x/net v0.0.0-20180724234803-3673e40ba225 h1:kNX+jCowfMYzvlSvJu5pQWEmyWFrBXJ3PBy10xKMXK8=
golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/net/context/ctxhttp.Get in pkg:golang/golang.org/x/net@v0.0.0-20180724234803-3673e40ba225",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/net@v0.0.0-20180724234803-3673e40ba225"
  ],
  "symbols": [
    "golang.org/x/net/context/ctxhttp.Get"
  ]
}

package main

import (
	"context"
	"fmt"
	"io"
	"net/http"
	"net/http/httptest"

	"golang.org/x/net/context/ctxhttp"
)

func main() {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodGet {
			http.Error(w, "expected GET", http.StatusMethodNotAllowed)
			return
		}
		w.Header().Set("Content-Type", "text/plain")
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write([]byte("ctxhttp-ok"))
	}))
	defer srv.Close()

	ctx := context.Background()
	resp, err := ctxhttp.Get(ctx, srv.Client(), srv.URL+"/hello")
	if err != nil {
		panic(fmt.Sprintf("unexpected error on valid Get: %v", err))
	}
	body, err := io.ReadAll(resp.Body)
	_ = resp.Body.Close()
	if err != nil {
		panic(fmt.Sprintf("reading response body failed: %v", err))
	}
	if resp.StatusCode != http.StatusOK || string(body) != "ctxhttp-ok" {
		panic(fmt.Sprintf("unexpected status=%d body=%q", resp.StatusCode, string(body)))
	}

	canceledCtx, cancel := context.WithCancel(context.Background())
	cancel()
	_, err = ctxhttp.Get(canceledCtx, srv.Client(), srv.URL+"/hello")
	if err == nil {
		panic("expected error when context is already canceled")
	}
}