golang.org/x/net v0.0.0-20210226172049-e18ecbb05110: 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@v0.0.0-20210226172049-e18ecbb05110
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/net@v0.0.0-20210226172049-e18ecbb05110
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:sha256:29d560cc98f8bcdff71fe45fa90bc25229b446761c026d4a7fd0c2aeab8065ad","contract":["httpproxy.Config.ProxyFunc routes HTTP and HTTPS URLs to configured proxy endpoints","httpproxy.Config.ProxyFunc bypasses proxy for URLs matching NoProxy rules"],"goal":"verify golang.org/x/net/http/httpproxy.Config in pkg:golang/golang.org/x/net@v0.0.0-20210226172049-e18ecbb05110","kind":"HOW","packages":["pkg:golang/golang.org/x/net@v0.0.0-20210226172049-e18ecbb05110"],"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@v0.0.0-20210226172049-e18ecbb05110"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/net@v0.0.0-20210226172049-e18ecbb05110","symbols":["golang.org/x/net/http/httpproxy.Config"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.25.0

require golang.org/x/net v0.0.0-20210226172049-e18ecbb05110

require golang.org/x/text v0.41.0 // indirect

golang.org/x/net v0.0.0-20210226172049-e18ecbb05110 h1:qWPm9rbaAMKs8Bq/9LRpbMqxWRVUAQwMI9fVrssnTfw=
golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/text v0.41.0 h1:vz/seA0lnX87Othu2f/0L24RcgrXD9/YFTSuGjj3rH8=
golang.org/x/text v0.41.0/go.mod h1:jvf1O8ajNzZqhSrQBPbutR/EB83Cc0CFrezNQIwbb5M=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=

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,bypass.example.org",
	}

	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 resolve proxy: %v", err)
	}

	if proxyURL != nil {
		fmt.Printf("Proxy for %s: %s\n", targetURL, proxyURL)
	} else {
		fmt.Printf("Direct connection for %s\n", targetURL)
	}
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/net/http/httpproxy.Config in pkg:golang/golang.org/x/net@v0.0.0-20210226172049-e18ecbb05110",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/net@v0.0.0-20210226172049-e18ecbb05110"
  ],
  "symbols": [
    "golang.org/x/net/http/httpproxy.Config"
  ]
}

package main

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

	"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,bypass.example.org",
	}

	proxyFunc := cfg.ProxyFunc()

	// Assertion 1: httpproxy.Config.ProxyFunc routes HTTP and HTTPS URLs to configured proxy endpoints
	{
		httpURL, err := url.Parse("http://service.example.com/items")
		if err != nil {
			fmt.Fprintf(os.Stderr, "failed to parse http url: %v\n", err)
			os.Exit(1)
		}
		pURL, err := proxyFunc(httpURL)
		if err != nil {
			fmt.Fprintf(os.Stderr, "proxyFunc returned error for http url: %v\n", err)
			os.Exit(1)
		}
		if pURL == nil || pURL.String() != "http://proxy.example.com:8080" {
			fmt.Fprintf(os.Stderr, "expected http proxy http://proxy.example.com:8080, got %v\n", pURL)
			os.Exit(1)
		}

		httpsURL, err := url.Parse("https://secure.example.com/items")
		if err != nil {
			fmt.Fprintf(os.Stderr, "failed to parse https url: %v\n", err)
			os.Exit(1)
		}
		pURL, err = proxyFunc(httpsURL)
		if err != nil {
			fmt.Fprintf(os.Stderr, "proxyFunc returned error for https url: %v\n", err)
			os.Exit(1)
		}
		if pURL == nil || pURL.String() != "https://secure-proxy.example.com:8443" {
			fmt.Fprintf(os.Stderr, "expected https proxy https://secure-proxy.example.com:8443, got %v\n", pURL)
			os.Exit(1)
		}
	}

	// Assertion 2: httpproxy.Config.ProxyFunc bypasses proxy for URLs matching NoProxy rules
	{
		bypassURLs := []string{
			"http://localhost:3000/api",
			"https://127.0.0.1:9090/metrics",
			"http://sub.internal.example.com/status",
			"http://bypass.example.org/data",
		}

		for _, rawURL := range bypassURLs {
			u, err := url.Parse(rawURL)
			if err != nil {
				fmt.Fprintf(os.Stderr, "failed to parse bypass url %q: %v\n", rawURL, err)
				os.Exit(1)
			}
			pURL, err := proxyFunc(u)
			if err != nil {
				fmt.Fprintf(os.Stderr, "proxyFunc returned error for bypass url %q: %v\n", rawURL, err)
				os.Exit(1)
			}
			if pURL != nil {
				fmt.Fprintf(os.Stderr, "expected no proxy for %q, but got %s\n", rawURL, pURL)
				os.Exit(1)
			}
		}
	}

	fmt.Println("All assertions passed")
}