diff --git a/src/server/network.ts b/src/server/network.ts
index fa4fc486b6..a9881fb219 100644
--- a/src/server/network.ts
+++ b/src/server/network.ts
@@ -183,6 +183,11 @@ export class Request {
     this._headersMap.clear();
     for (const { name, value } of this._headers)
       this._headersMap.set(name.toLowerCase(), value);
+    if (!this._headersMap.has('host')) {
+      const host = new URL(this._url).host;
+      this._headers.push({ name: 'host', value: host });
+      this._headersMap.set('host', host);
+    }
   }
 }
 
diff --git a/test/network-request.spec.ts b/test/network-request.spec.ts
index 2fd8ec6904..cbcca6ffc9 100644
--- a/test/network-request.spec.ts
+++ b/test/network-request.spec.ts
@@ -82,7 +82,7 @@ it('should return headers', async ({page, server, isChromium, isFirefox, isWebKi
 });
 
 it('should get the same headers as the server', (test, { browserName, platform }) => {
-  test.fail(browserName === 'webkit' && platform !== 'darwin', 'Provisional headers differ from those in network stack');
+  test.fail(browserName === 'webkit' && platform === 'win32', 'Curl does not show accept-encoding and accept-language');
 }, async ({ page, server }) => {
   let serverRequest;
   server.setRoute('/empty.html', (request, response) => {
@@ -94,7 +94,7 @@ it('should get the same headers as the server', (test, { browserName, platform }
 });
 
 it('should get the same headers as the server CORP', (test, { browserName, platform }) => {
-  test.fail(browserName === 'webkit' && platform !== 'darwin', 'Provisional headers differ from those in network stack');
+  test.fail(browserName === 'webkit' && platform === 'win32', 'Curl does not show accept-encoding and accept-language');
 }, async ({page, server}) => {
   await page.goto(server.PREFIX + '/empty.html');
   let serverRequest;
diff --git a/test/resource-timing.spec.ts b/test/resource-timing.spec.ts
index b06fb0a56e..ae635b24cb 100644
--- a/test/resource-timing.spec.ts
+++ b/test/resource-timing.spec.ts
@@ -48,7 +48,7 @@ it('should work for subresource', async ({ page, server, isWindows, isWebKit })
     expect(timing.secureConnectionStart).toBe(-1);
     expect(timing.connectEnd).toBeGreaterThan(timing.secureConnectionStart);
   } else {
-    expect(timing.domainLookupStart).toBe(-1);
+    expect(timing.domainLookupStart === 0 || timing.domainLookupStart === -1).toBeTruthy();
     expect(timing.domainLookupEnd).toBe(-1);
     expect(timing.connectStart).toBe(-1);
     expect(timing.secureConnectionStart).toBe(-1);