golang.org/x/net v0.0.0-20190311183353-d8887717615a: httpproxy.Config

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/http/httpproxy.Config in pkg:golang/golang.org/x/net@v0.0.0-20190311183353-d8887717615a
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/net@v0.0.0-20190311183353-d8887717615a
Demonstrate these symbols/APIs:
  - golang.org/x/net/http/httpproxy.Config

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:ecbbd5202cc39b0fea9c2a0554066bbdf018c95acbe0ad472101ea8eafa1fd1f","contract":["httpproxy.Config.ProxyFunc routes HTTP requests to configured HTTPProxy and HTTPS requests to HTTPSProxy","httpproxy.Config.ProxyFunc bypasses proxy for URLs matching destinations in NoProxy"],"goal":"verify golang.org/x/net/http/httpproxy.Config in pkg:golang/golang.org/x/net@v0.0.0-20190311183353-d8887717615a","kind":"HOW","packages":["pkg:golang/golang.org/x/net@v0.0.0-20190311183353-d8887717615a"],"schemaVersion":1,"symbols":["golang.org/x/net/http/httpproxy.Config"]},"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@v0.0.0-20190311183353-d8887717615a"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/net@v0.0.0-20190311183353-d8887717615a","symbols":["golang.org/x/net/http/httpproxy.Config"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.22

require golang.org/x/net v0.0.0-20190311183353-d8887717615a

require golang.org/x/text v0.3.0 // indirect

golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/net v0.0.0-20190311183353-d8887717615a h1:oWX7TPOiFAMXLq8o0ikBYfCJVlRHBcsciT5bXOrH628=
golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

package main

import (
	"fmt"
	"log"
	"net/url"

	"golang.org/x/net/http/httpproxy"
)

func main() {
	cfg := &httpproxy.Config{
		HTTPProxy:  "http://proxy.example.com:8080",
		HTTPSProxy: "https://secure-proxy.example.com:8443",
		NoProxy:    "localhost,127.0.0.1,.internal.example.com",
	}

	proxyFunc := cfg.ProxyFunc()

	targetURL, err := url.Parse("http://api.example.com/data")
	if err != nil {
		log.Fatalf("failed to parse url: %v", err)
	}

	proxyURL, err := proxyFunc(targetURL)
	if err != nil {
		log.Fatalf("failed to determine proxy: %v", err)
	}

	if proxyURL != nil {
		fmt.Printf("Routing %s via proxy: %s\n", targetURL, proxyURL)
	} else {
		fmt.Printf("Routing %s directly\n", targetURL)
	}

	fmt.Println("httpproxy.Config sample executed successfully")
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/net/http/httpproxy.Config in pkg:golang/golang.org/x/net@v0.0.0-20190311183353-d8887717615a",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/net@v0.0.0-20190311183353-d8887717615a"
  ],
  "symbols": [
    "golang.org/x/net/http/httpproxy.Config"
  ]
}

package main

import (
	"fmt"
	"net/url"
	"os"

	"golang.org/x/net/http/httpproxy"
)

func main() {
	// Assertion 1: httpproxy.Config.ProxyFunc routes HTTP requests to configured HTTPProxy and HTTPS requests to HTTPSProxy
	{
		cfg := &httpproxy.Config{
			HTTPProxy:  "http://proxy.example.com:8080",
			HTTPSProxy: "https://secure-proxy.example.com:8443",
		}
		proxyFunc := cfg.ProxyFunc()

		httpTarget, err := url.Parse("http://public.example.com/api")
		if err != nil {
			fmt.Fprintf(os.Stderr, "assertion 1 parse error: %v\n", err)
			os.Exit(1)
		}
		proxyURL, err := proxyFunc(httpTarget)
		if err != nil {
			fmt.Fprintf(os.Stderr, "assertion 1 proxyFunc error: %v\n", err)
			os.Exit(1)
		}
		if proxyURL == nil || proxyURL.String() != "http://proxy.example.com:8080" {
			fmt.Fprintf(os.Stderr, "assertion 1 failed: expected HTTP proxy http://proxy.example.com:8080, got %v\n", proxyURL)
			os.Exit(1)
		}

		httpsTarget, err := url.Parse("https://secure.example.com/api")
		if err != nil {
			fmt.Fprintf(os.Stderr, "assertion 1 parse error: %v\n", err)
			os.Exit(1)
		}
		proxyURL, err = proxyFunc(httpsTarget)
		if err != nil {
			fmt.Fprintf(os.Stderr, "assertion 1 proxyFunc error: %v\n", err)
			os.Exit(1)
		}
		if proxyURL == nil || proxyURL.String() != "https://secure-proxy.example.com:8443" {
			fmt.Fprintf(os.Stderr, "assertion 1 failed: expected HTTPS proxy https://secure-proxy.example.com:8443, got %v\n", proxyURL)
			os.Exit(1)
		}
	}

	// Assertion 2: httpproxy.Config.ProxyFunc bypasses proxy for URLs matching destinations in NoProxy
	{
		cfg := &httpproxy.Config{
			HTTPProxy:  "http://proxy.example.com:8080",
			HTTPSProxy: "https://secure-proxy.example.com:8443",
			NoProxy:    "localhost,127.0.0.1,.internal.example.com",
		}
		proxyFunc := cfg.ProxyFunc()

		bypasses := []string{
			"http://localhost:3000/health",
			"http://127.0.0.1:9000/metrics",
			"https://api.internal.example.com/data",
		}
		for _, rawURL := range bypasses {
			target, err := url.Parse(rawURL)
			if err != nil {
				fmt.Fprintf(os.Stderr, "assertion 2 parse error: %v\n", err)
				os.Exit(1)
			}
			proxyURL, err := proxyFunc(target)
			if err != nil {
				fmt.Fprintf(os.Stderr, "assertion 2 proxyFunc error: %v\n", err)
				os.Exit(1)
			}
			if proxyURL != nil {
				fmt.Fprintf(os.Stderr, "assertion 2 failed: expected bypass for %s, got %s\n", rawURL, proxyURL.String())
				os.Exit(1)
			}
		}
	}

	fmt.Println("All contract assertions passed.")
}