CodeSampleX

Sample

proxy-agent 6.5.0: ProxyAgent

Verified sample for npm proxy-agent 6.5.0: ProxyAgent. The contract ran on node 22 · linux alpine/x64 · docker and passed: ProxyAgent class export and…

sha256:80955dbb51409199ea7bd68302fd48aefe43a3cf20f9236cff387ab1d1373f4d

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment linux 24 · ubuntu · glibc 2.39 x64 npm

Verification-run environments

Environment Contract Stages Run
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-27

Case

HOW
Goal
verify proxy-agent.ProxyAgent in pkg:npm/proxy-agent@6.5.0
Packages
Symbols
  • proxy-agent.ProxyAgent
Created
2026-08-27T11:23:33Z

Contract

  1. ProxyAgent class export and proxies protocol map
  2. ProxyAgent constructor default configuration
  3. connect returns default httpAgent and httpsAgent when no proxy is configured
  4. connect resolves and caches HttpProxyAgent for HTTP proxy
  5. caching reuses the agent instance for identical protocol and proxy destination
  6. connect resolves HttpsProxyAgent for secure endpoint via HTTP proxy
  7. connect resolves SocksProxyAgent for SOCKS5 proxy URL
  8. connect resolves PacProxyAgent for PAC data URI
  9. connect throws on unsupported proxy protocol
  10. destroy cleans up and invokes destroy on cached agents

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • test/contract.mjs

Download the source artifact (tar.gz)

Source

PROMPT.md
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 proxy-agent.ProxyAgent in pkg:npm/proxy-agent@6.5.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/proxy-agent@6.5.0
Demonstrate these symbols/APIs:
  - proxy-agent.ProxyAgent

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.
csx.json
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package-lock.json
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}
package.json
{
  "name": "sample-proxy-agent",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "proxy-agent": "6.5.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify proxy-agent.ProxyAgent in pkg:npm/proxy-agent@6.5.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/proxy-agent@6.5.0"
  ],
  "symbols": [
    "proxy-agent.ProxyAgent"
  ]
}
test/contract.mjs
import assert from 'node:assert/strict';
import http from 'node:http';
import https from 'node:https';
import { ProxyAgent, proxies } from 'proxy-agent';

// 1. Verify ProxyAgent class export and proxies protocol map
assert.equal(typeof ProxyAgent, 'function');
assert.equal(typeof proxies, 'object');
assert.ok(Array.isArray(proxies.http));
assert.ok(Array.isArray(proxies.https));
assert.ok(Array.isArray(proxies.socks));
assert.ok(Array.isArray(proxies.socks5));
assert.ok(Array.isArray(proxies['pac+data']));

// 2. Verify ProxyAgent constructor default configuration
const defaultAgent = new ProxyAgent();
assert.ok(defaultAgent instanceof ProxyAgent);
assert.ok(defaultAgent.httpAgent instanceof http.Agent);
assert.ok(defaultAgent.httpsAgent instanceof https.Agent);
assert.equal(typeof defaultAgent.getProxyForUrl, 'function');
assert.equal(defaultAgent.cache.size, 0);

// Helper to create mock ClientRequest without opening real sockets
function createMockRequest(host, path = '/', headers = {}) {
  const headerMap = new Map(Object.entries(headers).map(([k, v]) => [k.toLowerCase(), v]));
  headerMap.set('host', host);
  return {
    path,
    getHeader(name) {
      return headerMap.get(name.toLowerCase());
    }
  };
}

// 3. Verify connect returns default httpAgent and httpsAgent when no proxy is configured
const directAgent = new ProxyAgent({
  getProxyForUrl: () => ''
});
const reqHttp = createMockRequest('example.com', '/test');
const resolvedHttp = await directAgent.connect(reqHttp, { secureEndpoint: false });
assert.equal(resolvedHttp, directAgent.httpAgent);

const reqHttps = createMockRequest('example.com', '/secure');
const resolvedHttps = await directAgent.connect(reqHttps, { secureEndpoint: true });
assert.equal(resolvedHttps, directAgent.httpsAgent);

// 4. Verify connect resolves and caches HttpProxyAgent for HTTP proxy
const customAgent = new ProxyAgent({
  getProxyForUrl: (url) => {
    if (url.includes('proxy.example.com')) {
      return 'http://127.0.0.1:8080';
    }
    return '';
  }
});
const reqProxied = createMockRequest('proxy.example.com', '/api');
const resolvedHttpProxy = await customAgent.connect(reqProxied, { secureEndpoint: false });
assert.equal(resolvedHttpProxy.constructor.name, 'HttpProxyAgent');
assert.equal(customAgent.cache.size, 1);

// 5. Verify caching reuses the agent instance for identical protocol and proxy destination
const resolvedAgain = await customAgent.connect(reqProxied, { secureEndpoint: false });
assert.equal(resolvedAgain, resolvedHttpProxy);
assert.equal(customAgent.cache.size, 1);

// 6. Verify connect resolves HttpsProxyAgent for secure endpoint via HTTP proxy
const reqSecureProxied = createMockRequest('proxy.example.com', '/secure-api');
const resolvedHttpsProxy = await customAgent.connect(reqSecureProxied, { secureEndpoint: true });
assert.equal(resolvedHttpsProxy.constructor.name, 'HttpsProxyAgent');
assert.equal(customAgent.cache.size, 2);

// 7. Verify connect resolves SocksProxyAgent for SOCKS5 proxy URL
const socksAgent = new ProxyAgent({
  getProxyForUrl: () => 'socks5://127.0.0.1:1080'
});
const reqSocks = createMockRequest('socks.example.com', '/data');
const resolvedSocks = await socksAgent.connect(reqSocks, { secureEndpoint: false });
assert.equal(resolvedSocks.constructor.name, 'SocksProxyAgent');

// 8. Verify connect resolves PacProxyAgent for PAC data URI
const pacScript = 'function FindProxyForURL(url, host) { return "DIRECT"; }';
const pacDataUri = `pac+data:text/plain;charset=utf-8,${encodeURIComponent(pacScript)}`;
const pacAgent = new ProxyAgent({
  getProxyForUrl: () => pacDataUri
});
const reqPac = createMockRequest('pac.example.com', '/resource');
const resolvedPac = await pacAgent.connect(reqPac, { secureEndpoint: false });
assert.equal(resolvedPac.constructor.name, 'PacProxyAgent');

// 9. Verify connect throws on unsupported proxy protocol
const invalidProtoAgent = new ProxyAgent({
  getProxyForUrl: () => 'ftp://127.0.0.1:21'
});
const reqInvalid = createMockRequest('invalid.example.com', '/');
await assert.rejects(
  async () => {
    await invalidProtoAgent.connect(reqInvalid, { secureEndpoint: false });
  },
  {
    name: 'Error',
    message: /Unsupported protocol for proxy URL: ftp:\/\/127\.0\.0\.1:21/
  }
);

// 10. Verify destroy cleans up and invokes destroy on cached agents
let destroyedCalled = false;
resolvedHttpProxy.destroy = () => {
  destroyedCalled = true;
};
customAgent.destroy();
assert.equal(destroyedCalled, true);

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