http: support http proxy for fetch under NODE_USE_ENV_PROXY

joyeecheung · joyeecheung · commit a8cc0f25388e · 2025-03-10T19:20:04.000+01:00
When enabled, Node.js parses the `HTTP_PROXY`, `HTTPS_PROXY` and
`NO_PROXY` environment variables during startup, and tunnels requests
over the specified proxy.

This currently only affects requests sent over `fetch()`. Support for
other built-in `http` and `https` methods is under way.
diff --git a/doc/api/cli.md b/doc/api/cli.md
@@ -3528,6 +3528,21 @@ If `value` equals `'0'`, certificate validation is disabled for TLS connections.
 This makes TLS, and HTTPS by extension, insecure. The use of this environment
 variable is strongly discouraged.
 
+### `NODE_USE_ENV_PROXY=1`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+> Stability: 1.1 - Active Development
+
+When enabled, Node.js parses the `HTTP_PROXY`, `HTTPS_PROXY` and `NO_PROXY`
+environment variables during startup, and tunnels requests over the
+specified proxy.
+
+This currently only affects requests sent over `fetch()`. Support for other
+built-in `http` and `https` methods is under way.
+
 ### `NODE_V8_COVERAGE=dir`
 
 When set, Node.js will begin outputting [V8 JavaScript code coverage][] and
diff --git a/lib/internal/process/pre_execution.js b/lib/internal/process/pre_execution.js
@@ -119,6 +119,7 @@ function prepareExecution(options) {
   initializeConfigFileSupport();
 
   require('internal/dns/utils').initializeDns();
+  setupHttpProxy();
 
   if (isMainThread) {
     assert(internalBinding('worker').isMainThread);
@@ -154,6 +155,21 @@ function prepareExecution(options) {
   return mainEntry;
 }
 
+function setupHttpProxy() {
+  if (process.env.NODE_USE_ENV_PROXY &&
+      (process.env.HTTP_PROXY || process.env.HTTPS_PROXY ||
+       process.env.http_proxy || process.env.https_proxy)) {
+    const { setGlobalDispatcher, EnvHttpProxyAgent } = require('internal/deps/undici/undici');
+    const envHttpProxyAgent = new EnvHttpProxyAgent();
+    setGlobalDispatcher(envHttpProxyAgent);
+    // TODO(joyeecheung): This currently only affects fetch. Implement handling in the
+    // http/https Agent constructor too.
+    // TODO(joyeecheung): This is currently guarded with NODE_USE_ENV_PROXY. Investigate whether
+    // it's possible to enable it by default without stepping on other existing libraries that
+    // sets the global dispatcher or monkey patches the global agent.
+  }
+}
+
 function setupUserModules(forceDefaultLoader = false) {
   initializeCJSLoader();
   initializeESMLoader(forceDefaultLoader);
diff --git a/test/common/proxy-server.js b/test/common/proxy-server.js
@@ -0,0 +1,100 @@
+'use strict';
+
+const net = require('net');
+const http = require('http');
+const assert = require('assert');
+
+function logRequest(logs, req) {
+  logs.push({
+    method: req.method,
+    url: req.url,
+    headers: { ...req.headers },
+  });
+}
+
+// This creates a minimal proxy server that logs the requests it gets
+// to an array before performing proxying.
+exports.createProxyServer = function() {
+  const logs = [];
+
+  const proxy = http.createServer();
+  proxy.on('request', (req, res) => {
+    logRequest(logs, req);
+    const [hostname, port] = req.headers.host.split(':');
+    const targetPort = port || 80;
+
+    const options = {
+      hostname: hostname,
+      port: targetPort,
+      path: req.url,
+      method: req.method,
+      headers: req.headers,
+    };
+
+    const proxyReq = http.request(options, (proxyRes) => {
+      res.writeHead(proxyRes.statusCode, proxyRes.headers);
+      proxyRes.pipe(res, { end: true });
+    });
+
+    proxyReq.on('error', (err) => {
+      logs.push({ error: err, source: 'proxy request' });
+      res.writeHead(500);
+      res.end('Proxy error: ' + err.message);
+    });
+
+    req.pipe(proxyReq, { end: true });
+  });
+
+  proxy.on('connect', (req, res, head) => {
+    logRequest(logs, req);
+
+    const [hostname, port] = req.url.split(':');
+    const proxyReq = net.connect(port, hostname, () => {
+      res.write(
+        'HTTP/1.1 200 Connection Established\r\n' +
+        'Proxy-agent: Node.js-Proxy\r\n' +
+        '\r\n',
+      );
+      proxyReq.write(head);
+      res.pipe(proxyReq);
+      proxyReq.pipe(res);
+    });
+
+    proxyReq.on('error', (err) => {
+      logs.push({ error: err, source: 'proxy request' });
+      res.write('HTTP/1.1 500 Connection Error\r\n\r\n');
+      res.end('Proxy error: ' + err.message);
+    });
+  });
+
+  proxy.on('error', (err) => {
+    logs.push({ error: err, source: 'proxy server' });
+  });
+
+  return { proxy, logs };
+};
+
+exports.checkProxiedRequest = async function(envExtension, expectation) {
+  const { spawnPromisified } = require('./');
+  const fixtures = require('./fixtures');
+  const { code, signal, stdout, stderr } = await spawnPromisified(
+    process.execPath,
+    [fixtures.path('fetch-and-log.mjs')], {
+      env: {
+        ...process.env,
+        ...envExtension,
+      },
+    });
+
+  assert.deepStrictEqual({
+    stderr: stderr.trim(),
+    stdout: stdout.trim(),
+    code,
+    signal,
+  }, {
+    stderr: '',
+    code: 0,
+    signal: null,
+    ...expectation,
+  });
+};
diff --git a/test/fixtures/fetch-and-log.mjs b/test/fixtures/fetch-and-log.mjs
@@ -0,0 +1,3 @@
+const response = await fetch(process.env.FETCH_URL);
+const body = await response.text();
+console.log(body);
diff --git a/test/fixtures/keys/Makefile b/test/fixtures/keys/Makefile
@@ -244,6 +244,31 @@ fake-startcom-root-cert.pem: fake-startcom-root.cnf \
 	echo '01' > fake-startcom-root-serial
 	touch fake-startcom-root-database.txt
 
+test-localhost-ca.key:
+	openssl genrsa -out test-localhost-ca.key 4096
+
+test-localhost-ca.pem: test-localhost-ca.key
+	openssl req -x509 -new \
+		-key test-localhost-ca.key \
+		-days 9999 \
+		-subj '/CN=NodeJS Test CA' \
+		-out test-localhost-ca.pem
+
+test-localhost-key.pem: test-localhost-ca.pem
+	openssl req -newkey rsa:4096 \
+		-keyout test-localhost-key.pem \
+		-out test-localhost.csr \
+		-nodes -subj '/CN=localhost'
+
+test-localhost-cert.pem: test-localhost-key.pem
+	openssl x509 -req -in test-localhost.csr \
+		-CA test-localhost-ca.pem \
+		-CAkey test-localhost-ca.key \
+		-CAcreateserial \
+		-days 99999 \
+		-out test-localhost-cert.pem
+
+	rm test-localhost.csr
 
 intermediate-ca-key.pem:
 	openssl genrsa -out intermediate.key 2048
diff --git a/test/fixtures/keys/test-localhost-ca.key b/test/fixtures/keys/test-localhost-ca.key
@@ -0,0 +1,51 @@
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----
diff --git a/test/fixtures/keys/test-localhost-ca.pem b/test/fixtures/keys/test-localhost-ca.pem
@@ -0,0 +1,30 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
diff --git a/test/fixtures/keys/test-localhost-ca.srl b/test/fixtures/keys/test-localhost-ca.srl
@@ -0,0 +1 @@
+0A80D82186AD73F90DA52BA942ABBB1A2D4524F3
diff --git a/test/fixtures/keys/test-localhost-cert.pem b/test/fixtures/keys/test-localhost-cert.pem
@@ -0,0 +1,28 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
diff --git a/test/fixtures/keys/test-localhost-key.pem b/test/fixtures/keys/test-localhost-key.pem
@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----
diff --git a/test/parallel/test-http-proxy-fetch.js b/test/parallel/test-http-proxy-fetch.js
diff --git a/test/parallel/test-https-proxy-fetch.js b/test/parallel/test-https-proxy-fetch.js

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+const response = await fetch(process.env.FETCH_URL);`
	`2`	`+const body = await response.text();`
	`3`	`+console.log(body);`
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+0A80D82186AD73F90DA52BA942ABBB1A2D4524F3`