diff --git a/.github/workflows/tests_secondary.yml b/.github/workflows/tests_secondary.yml
index d5844b1ca3..7d2847a7ff 100644
--- a/.github/workflows/tests_secondary.yml
+++ b/.github/workflows/tests_secondary.yml
@@ -119,6 +119,7 @@ jobs:
         - "^12.0.0"
         - "^14.1.0"  # pre 14.1, zip extraction was broken (https://github.com/microsoft/playwright/issues/1988)
         - "^16.0.0"
+        - "^18.0.0"
     timeout-minutes: 20
     steps:
     - uses: actions/checkout@v2
diff --git a/packages/playwright-core/src/common/socksProxy.ts b/packages/playwright-core/src/common/socksProxy.ts
index 504afdfc6a..2c8c5a8270 100644
--- a/packages/playwright-core/src/common/socksProxy.ts
+++ b/packages/playwright-core/src/common/socksProxy.ts
@@ -375,7 +375,10 @@ export class SocksProxyHandler extends EventEmitter {
 
   async socketRequested({ uid, host, port }: SocksSocketRequestedPayload): Promise<void> {
     if (host === 'local.playwright')
-      host = 'localhost';
+      host = '127.0.0.1';
+    // Node.js 17 does resolve localhost to ipv6
+    if (host === 'localhost')
+      host = '127.0.0.1';
     try {
       if (this._redirectPortForTest)
         port = this._redirectPortForTest;
diff --git a/packages/playwright-core/src/server/chromium/chromium.ts b/packages/playwright-core/src/server/chromium/chromium.ts
index 019e552c5f..19bb9f32f6 100644
--- a/packages/playwright-core/src/server/chromium/chromium.ts
+++ b/packages/playwright-core/src/server/chromium/chromium.ts
@@ -225,7 +225,8 @@ export class Chromium extends BrowserType {
         const chromeOptions = maybeChromeOptions && typeof maybeChromeOptions === 'object' ? maybeChromeOptions : undefined;
         const debuggerAddress = chromeOptions && typeof chromeOptions.debuggerAddress === 'string' ? chromeOptions.debuggerAddress : undefined;
         const chromeOptionsURL = typeof maybeChromeOptions === 'string' ? maybeChromeOptions : undefined;
-        const endpointURLString = addProtocol(debuggerAddress || chromeOptionsURL);
+        // TODO(dgozman): figure out if we can make ChromeDriver to return 127.0.0.1 instead of localhost.
+        const endpointURLString = addProtocol(debuggerAddress || chromeOptionsURL).replace('localhost', '127.0.0.1');
         progress.log(`<selenium> retrieved endpoint ${endpointURLString} for sessionId=${sessionId}`);
         endpointURL = new URL(endpointURLString);
         if (endpointURL.hostname === 'localhost' || endpointURL.hostname === '127.0.0.1') {
diff --git a/packages/playwright-core/src/server/fetch.ts b/packages/playwright-core/src/server/fetch.ts
index f2fbef7a71..e17ea3484c 100644
--- a/packages/playwright-core/src/server/fetch.ts
+++ b/packages/playwright-core/src/server/fetch.ts
@@ -364,11 +364,12 @@ export abstract class APIRequestContext extends SdkObject {
             if (e)
               reject(new Error(`failed to decompress '${encoding}' encoding: ${e}`));
           });
+        } else {
+          body.on('error', reject);
         }
 
         body.on('data', chunk => chunks.push(chunk));
         body.on('end', notifyBodyFinished);
-        body.on('error', reject);
       });
       request.on('error', reject);
 
diff --git a/packages/playwright-webkit/package.json b/packages/playwright-webkit/package.json
index 0399185270..10de80842c 100644
--- a/packages/playwright-webkit/package.json
+++ b/packages/playwright-webkit/package.json
@@ -16,7 +16,8 @@
       "import": "./index.mjs",
       "require": "./index.js"
     },
-    "./": "./"
+    "./cli": "./cli.js",
+    "./package.json": "./package.json"
   },
   "bin": {
     "playwright": "./cli.js"
diff --git a/tests/config/commonFixtures.ts b/tests/config/commonFixtures.ts
index 90828a6aa2..85da894b71 100644
--- a/tests/config/commonFixtures.ts
+++ b/tests/config/commonFixtures.ts
@@ -141,7 +141,7 @@ export const commonFixtures: Fixtures<CommonFixtures, {}> = {
     await use(async port => {
       while (!token.canceled) {
         const promise = new Promise<boolean>(resolve => {
-          const conn = net.connect(port)
+          const conn = net.connect(port, '127.0.0.1')
               .on('error', () => resolve(false))
               .on('connect', () => {
                 conn.end();
diff --git a/tests/library/browsercontext-fetch.spec.ts b/tests/library/browsercontext-fetch.spec.ts
index 0221260ac3..97d24c50ac 100644
--- a/tests/library/browsercontext-fetch.spec.ts
+++ b/tests/library/browsercontext-fetch.spec.ts
@@ -963,7 +963,7 @@ it('should work with connectOverCDP', async ({ browserName, browserType, server
     args: ['--remote-debugging-port=' + port]
   });
   try {
-    const cdpBrowser = await browserType.connectOverCDP(`http://localhost:${port}/`);
+    const cdpBrowser = await browserType.connectOverCDP(`http://127.0.0.1:${port}/`);
     const [context] = cdpBrowser.contexts();
     const response = await context.request.get(server.PREFIX + '/simple.json');
     expect(response.url()).toBe(server.PREFIX + '/simple.json');
diff --git a/tests/library/browsertype-launch-selenium.spec.ts b/tests/library/browsertype-launch-selenium.spec.ts
index 345c8dee5f..db5495c91b 100644
--- a/tests/library/browsertype-launch-selenium.spec.ts
+++ b/tests/library/browsertype-launch-selenium.spec.ts
@@ -47,7 +47,7 @@ test('selenium grid 3.141.59 standalone chromium', async ({ browserName, childPr
   });
   await waitForPort(port);
 
-  const __testHookSeleniumRemoteURL = `http://localhost:${port}/wd/hub`;
+  const __testHookSeleniumRemoteURL = `http://127.0.0.1:${port}/wd/hub`;
   const browser = await browserType.launch({ __testHookSeleniumRemoteURL } as any);
   const page = await browser.newPage();
   await page.setContent('<title>Hello world</title><div>Get Started</div>');
@@ -71,7 +71,7 @@ test('selenium grid 3.141.59 hub + node chromium', async ({ browserName, childPr
   await waitForPort(port);
 
   const node = childProcess({
-    command: ['java', `-Dwebdriver.chrome.driver=${chromeDriver}`, '-jar', standalone_3_141_59, '-role', 'node', '-host', '127.0.0.1', '-hub', `http://localhost:${port}/grid/register`],
+    command: ['java', `-Dwebdriver.chrome.driver=${chromeDriver}`, '-jar', standalone_3_141_59, '-role', 'node', '-host', '127.0.0.1', '-hub', `http://127.0.0.1:${port}/grid/register`],
     cwd: __dirname,
   });
   await Promise.all([
@@ -79,7 +79,7 @@ test('selenium grid 3.141.59 hub + node chromium', async ({ browserName, childPr
     hub.waitForOutput('Registered a node'),
   ]);
 
-  const __testHookSeleniumRemoteURL = `http://localhost:${port}/wd/hub`;
+  const __testHookSeleniumRemoteURL = `http://127.0.0.1:${port}/wd/hub`;
   const browser = await browserType.launch({ __testHookSeleniumRemoteURL } as any);
   const page = await browser.newPage();
   await page.setContent('<title>Hello world</title><div>Get Started</div>');
@@ -103,7 +103,7 @@ test('selenium grid 4.0.0-rc-1 standalone chromium', async ({ browserName, child
   });
   await waitForPort(port);
 
-  const __testHookSeleniumRemoteURL = `http://localhost:${port}/wd/hub`;
+  const __testHookSeleniumRemoteURL = `http://127.0.0.1:${port}/wd/hub`;
   const browser = await browserType.launch({ __testHookSeleniumRemoteURL } as any);
   const page = await browser.newPage();
   await page.setContent('<title>Hello world</title><div>Get Started</div>');
@@ -125,10 +125,10 @@ test('selenium grid 4.0.0-rc-1 hub + node chromium', async ({ browserName, child
     cwd: __dirname,
   });
   await waitForPort(port);
-  const __testHookSeleniumRemoteURL = `http://localhost:${port}/wd/hub`;
+  const __testHookSeleniumRemoteURL = `http://127.0.0.1:${port}/wd/hub`;
 
   const node = childProcess({
-    command: ['java', `-Dwebdriver.chrome.driver=${chromeDriver}`, '-jar', selenium_4_0_0_rc1, 'node', '--grid-url', `http://localhost:${port}`, '--port', String(port + 1)],
+    command: ['java', `-Dwebdriver.chrome.driver=${chromeDriver}`, '-jar', selenium_4_0_0_rc1, 'node', '--grid-url', `http://127.0.0.1:${port}`, '--port', String(port + 1)],
     cwd: __dirname,
   });
   await Promise.all([
@@ -158,9 +158,9 @@ test('selenium grid 4.0.0-rc-1 standalone chromium broken driver', async ({ brow
   });
   await waitForPort(port);
 
-  const __testHookSeleniumRemoteURL = `http://localhost:${port}/wd/hub`;
+  const __testHookSeleniumRemoteURL = `http://127.0.0.1:${port}/wd/hub`;
   const error = await browserType.launch({ __testHookSeleniumRemoteURL } as any).catch(e => e);
-  expect(error.message).toContain(`Error connecting to Selenium at http://localhost:${port}/wd/hub/session: Could not start a new session`);
+  expect(error.message).toContain(`Error connecting to Selenium at http://127.0.0.1:${port}/wd/hub/session: Could not start a new session`);
 
   expect(grid.output).not.toContain('Starting ChromeDriver');
 });
@@ -168,7 +168,7 @@ test('selenium grid 4.0.0-rc-1 standalone chromium broken driver', async ({ brow
 test('selenium grid 3.141.59 standalone non-chromium', async ({ browserName, browserType }, testInfo) => {
   test.skip(browserName === 'chromium');
 
-  const __testHookSeleniumRemoteURL = `http://localhost:4444/wd/hub`;
+  const __testHookSeleniumRemoteURL = `http://127.0.0.1:4444/wd/hub`;
   const error = await browserType.launch({ __testHookSeleniumRemoteURL } as any).catch(e => e);
   expect(error.message).toContain('Connecting to SELENIUM_REMOTE_URL is only supported by Chromium');
 });
@@ -184,7 +184,7 @@ test('selenium grid 3.141.59 standalone chromium through run-driver', async ({ b
   await waitForPort(port);
 
   const { playwright: pw, stop } = await start({
-    SELENIUM_REMOTE_URL: `http://localhost:${port}/wd/hub`,
+    SELENIUM_REMOTE_URL: `http://127.0.0.1:${port}/wd/hub`,
   });
   const browser = await pw.chromium.launch();
   const page = await browser.newPage();
diff --git a/tests/library/chromium/chromium.spec.ts b/tests/library/chromium/chromium.spec.ts
index e1456a06a3..bb6f08bfe0 100644
--- a/tests/library/chromium/chromium.spec.ts
+++ b/tests/library/chromium/chromium.spec.ts
@@ -102,7 +102,7 @@ playwrightTest('should connect to an existing cdp session', async ({ browserType
   });
   try {
     const cdpBrowser = await browserType.connectOverCDP({
-      endpointURL: `http://localhost:${port}/`,
+      endpointURL: `http://127.0.0.1:${port}/`,
     });
     const contexts = cdpBrowser.contexts();
     expect(contexts.length).toBe(1);
@@ -120,7 +120,7 @@ playwrightTest('should cleanup artifacts dir after connectOverCDP disconnects du
     args: ['--remote-debugging-port=' + port]
   });
   const cdpBrowser = await browserType.connectOverCDP({
-    endpointURL: `http://localhost:${port}/`,
+    endpointURL: `http://127.0.0.1:${port}/`,
   });
   const dir = toImpl(cdpBrowser).options.artifactsDir;
   const exists1 = fs.existsSync(dir);
@@ -140,10 +140,10 @@ playwrightTest('should connect to an existing cdp session twice', async ({ brows
   });
   try {
     const cdpBrowser1 = await browserType.connectOverCDP({
-      endpointURL: `http://localhost:${port}/`,
+      endpointURL: `http://127.0.0.1:${port}/`,
     });
     const cdpBrowser2 = await browserType.connectOverCDP({
-      endpointURL: `http://localhost:${port}/`,
+      endpointURL: `http://127.0.0.1:${port}/`,
     });
     const contexts1 = cdpBrowser1.contexts();
     expect(contexts1.length).toBe(1);
@@ -178,7 +178,7 @@ playwrightTest('should connect to existing page with iframe and navigate', async
       const page = await context1.newPage();
       await page.goto(server.PREFIX + '/frames/one-frame.html');
     }
-    const cdpBrowser = await browserType.connectOverCDP(`http://localhost:${port}/`);
+    const cdpBrowser = await browserType.connectOverCDP(`http://127.0.0.1:${port}/`);
     const contexts = cdpBrowser.contexts();
     expect(contexts.length).toBe(1);
     await contexts[0].pages()[0].goto(server.EMPTY_PAGE);
@@ -195,7 +195,7 @@ playwrightTest('should connect to existing service workers', async ({ browserTyp
   });
   try {
     const cdpBrowser1 = await browserType.connectOverCDP({
-      endpointURL: `http://localhost:${port}`,
+      endpointURL: `http://127.0.0.1:${port}`,
     });
     const context = cdpBrowser1.contexts()[0];
     const page = await cdpBrowser1.contexts()[0].newPage();
@@ -207,7 +207,7 @@ playwrightTest('should connect to existing service workers', async ({ browserTyp
     await cdpBrowser1.close();
 
     const cdpBrowser2 = await browserType.connectOverCDP({
-      endpointURL: `http://localhost:${port}`,
+      endpointURL: `http://127.0.0.1:${port}`,
     });
     const context2 = cdpBrowser2.contexts()[0];
     expect(context2.serviceWorkers().length).toBe(1);
@@ -224,7 +224,7 @@ playwrightTest('should connect over a ws endpoint', async ({ browserType, server
   });
   try {
     const json = await new Promise<string>((resolve, reject) => {
-      http.get(`http://localhost:${port}/json/version/`, resp => {
+      http.get(`http://127.0.0.1:${port}/json/version/`, resp => {
         let data = '';
         resp.on('data', chunk => data += chunk);
         resp.on('end', () => resolve(data));
@@ -306,7 +306,7 @@ playwrightTest('should report all pages in an existing browser', async ({ browse
   });
   try {
     const cdpBrowser = await browserType.connectOverCDP({
-      endpointURL: `http://localhost:${port}/`,
+      endpointURL: `http://127.0.0.1:${port}/`,
     });
     const contexts = cdpBrowser.contexts();
     expect(contexts.length).toBe(1);
@@ -315,7 +315,7 @@ playwrightTest('should report all pages in an existing browser', async ({ browse
     await cdpBrowser.close();
 
     const cdpBrowser2 = await browserType.connectOverCDP({
-      endpointURL: `http://localhost:${port}/`,
+      endpointURL: `http://127.0.0.1:${port}/`,
     });
     expect(cdpBrowser2.contexts()[0].pages().length).toBe(3);
 
@@ -332,7 +332,7 @@ playwrightTest('should connect via https', async ({ browserType, httpsServer, mo
     args: ['--remote-debugging-port=' + port]
   });
   const json = await new Promise<string>((resolve, reject) => {
-    http.get(`http://localhost:${port}/json/version/`, resp => {
+    http.get(`http://127.0.0.1:${port}/json/version/`, resp => {
       let data = '';
       resp.on('data', chunk => data += chunk);
       resp.on('end', () => resolve(data));
@@ -366,7 +366,7 @@ playwrightTest('should return valid browser from context.browser()', async ({ br
   });
   try {
     const cdpBrowser = await browserType.connectOverCDP({
-      endpointURL: `http://localhost:${port}/`,
+      endpointURL: `http://127.0.0.1:${port}/`,
     });
     const contexts = cdpBrowser.contexts();
     expect(contexts.length).toBe(1);
@@ -410,7 +410,7 @@ playwrightTest('should connect to an existing cdp session when passed as a first
     args: ['--remote-debugging-port=' + port]
   });
   try {
-    const cdpBrowser = await browserType.connectOverCDP(`http://localhost:${port}/`);
+    const cdpBrowser = await browserType.connectOverCDP(`http://127.0.0.1:${port}/`);
     const contexts = cdpBrowser.contexts();
     expect(contexts.length).toBe(1);
     await cdpBrowser.close();
@@ -428,7 +428,7 @@ playwrightTest('should use proxy with connectOverCDP', async ({ browserType, ser
     args: ['--remote-debugging-port=' + port, ...(process.platform === 'win32' ? ['--proxy-server=some-value'] : [])]
   });
   try {
-    const cdpBrowser = await browserType.connectOverCDP(`http://localhost:${port}/`);
+    const cdpBrowser = await browserType.connectOverCDP(`http://127.0.0.1:${port}/`);
     const context = await cdpBrowser.newContext({
       proxy: { server: `localhost:${server.PORT}` }
     });
diff --git a/tests/library/permissions.spec.ts b/tests/library/permissions.spec.ts
index 13b8c354f9..473f8c88fe 100644
--- a/tests/library/permissions.spec.ts
+++ b/tests/library/permissions.spec.ts
@@ -51,7 +51,7 @@ it.describe('permissions', () => {
   it('should prompt for geolocation permission when origin is not listed', async ({ page, context, server }) => {
     await page.goto(server.EMPTY_PAGE);
     await context.grantPermissions(['geolocation'], { origin: server.EMPTY_PAGE });
-    await page.goto(server.EMPTY_PAGE.replace('localhost', '127.0.0.1'));
+    await page.goto(server.CROSS_PROCESS_PREFIX + '/empty.html');
     expect(await getPermission(page, 'geolocation')).toBe('prompt');
   });
 
diff --git a/tests/library/port-forwarding-server.spec.ts b/tests/library/port-forwarding-server.spec.ts
index eaebc2f5c4..9ae7fcc503 100644
--- a/tests/library/port-forwarding-server.spec.ts
+++ b/tests/library/port-forwarding-server.spec.ts
@@ -117,7 +117,7 @@ it('should proxy localhost requests @smoke', async ({ pageFactory, server, brows
   });
   const examplePort = 20_000 + workerInfo.workerIndex * 3;
   const page = await pageFactory(testServerPort);
-  await page.goto(`http://localhost:${examplePort}/foo.html`);
+  await page.goto(`http://127.0.0.1:${examplePort}/foo.html`);
   expect(await page.content()).toContain('from-retargeted-server');
   expect(reachedOriginalTarget).toBe(false);
   stopTestServer();
@@ -134,7 +134,7 @@ it('should proxy localhost requests from fetch api', async ({ pageFactory, serve
   });
   const examplePort = 20_000 + workerInfo.workerIndex * 3;
   const page = await pageFactory(testServerPort);
-  const response = await page.request.get(`http://localhost:${examplePort}/foo.html`);
+  const response = await page.request.get(`http://127.0.0.1:${examplePort}/foo.html`);
   expect(response.status()).toBe(200);
   expect(await response.text()).toContain('from-retargeted-server');
   expect(reachedOriginalTarget).toBe(false);
@@ -159,9 +159,9 @@ it('should proxy local.playwright requests', async ({ pageFactory, server, brows
 it('should lead to the error page for forwarded requests when the connection is refused', async ({ pageFactory, browserName }, workerInfo) => {
   const examplePort = 20_000 + workerInfo.workerIndex * 3;
   const page = await pageFactory();
-  const error = await page.goto(`http://localhost:${examplePort}`).catch(e => e);
+  const error = await page.goto(`http://127.0.0.1:${examplePort}`).catch(e => e);
   if (browserName === 'chromium')
-    expect(error.message).toContain('net::ERR_SOCKS_CONNECTION_FAILED at http://localhost:20');
+    expect(error.message).toContain('net::ERR_SOCKS_CONNECTION_FAILED at http://127.0.0.1:20');
   else if (browserName === 'webkit')
     expect(error.message).toBeTruthy();
   else if (browserName === 'firefox')