playwright/docs/src/network.md

id	title
network	Network

Playwright provides APIs to monitor and modify network traffic, both HTTP and HTTPS. Any requests that page does, including XHRs and fetch requests, can be tracked, modified and handled.

HTTP Authentication

const context = await browser.newContext({
  httpCredentials: {
    username: 'bill',
    password: 'pa55w0rd',
  },
});
const page = await context.newPage();
await page.goto('https://example.com');

context = await browser.new_context(
    http_credentials={"username": "bill", "password": "pa55w0rd"}
)
page = await context.new_page()
await page.goto("https://example.com")

context = browser.new_context(
    http_credentials={"username": "bill", "password": "pa55w0rd"}
)
page = context.new_page()
page.goto("https://example.com")

API reference

• [method: Browser.newContext]

Network events

You can monitor all the requests and responses:

const { chromium, webkit, firefox } = require('playwright');

(async () => {
  const browser = await chromium.launch();
  const page = await browser.newPage();

  // Subscribe to 'request' and 'response' events.
  page.on('request', request =>
      console.log('>>', request.method(), request.url()));
  page.on('response', response =>
      console.log('<<', response.status(), response.url()));
  await page.goto('https://example.com');

  await browser.close();
})();

import asyncio
from playwright.async_api import async_playwright

async def run(playwright):
    chromium = playwright.chromium
    browser = await chromium.launch()
    page = await browser.new_page()
    # Subscribe to "request" and "response" events.
    page.on("request", lambda request: print(">>", request.method, request.url))
    page.on("response", lambda response: print("<<", response.status, response.url))
    await page.goto("https://example.com")
    await browser.close()

async def main():
    async with async_playwright() as playwright:
        await run(playwright)
asyncio.run(main())

from playwright.sync_api import sync_playwright

def run(playwright):
    chromium = playwright.chromium
    browser = chromium.launch()
    page = browser.new_page()
    # Subscribe to "request" and "response" events.
    page.on("request", lambda request: print(">>", request.method, request.url))
    page.on("response", lambda response: print("<<", response.status, response.url))
    page.goto("https://example.com")
    browser.close()

with sync_playwright() as playwright:
    run(playwright)

Or wait for a network response after the button click:

// Use a glob URL pattern
const [response] = await Promise.all([
  page.waitForResponse('**/api/fetch_data'),
  page.click('button#update'),
]);

# Use a glob url pattern
async with page.expect_response("**/api/fetch_data") as response_info:
    await page.click("button#update")
response = await response_info.value

# Use a glob url pattern
with page.expect_response("**/api/fetch_data") as response_info:
    page.click("button#update")
response = response_info.value

Variations

// Use a RegExp
const [response] = await Promise.all([
  page.waitForResponse(/\.jpeg$/),
  page.click('button#update'),
]);

// Use a predicate taking a Response object
const [response] = await Promise.all([
  page.waitForResponse(response => response.url().includes(token)),
  page.click('button#update'),
]);

# Use a regular expression
async with page.expect_response(re.compile(r"\.jpeg$")) as response_info:
    await page.click("button#update")
response = await response_info.value

# Use a predicate taking a response object
async with page.expect_response(lambda response: token in response.url) as response_info:
    await page.click("button#update")
response = await response_info.value

# Use a regular expression
with page.expect_response(re.compile(r"\.jpeg$")) as response_info:
    page.click("button#update")
response = response_info.value

# Use a predicate taking a response object
with page.expect_response(lambda response: token in response.url) as response_info:
    page.click("button#update")
response = response_info.value

API reference

• [Request]
• [Response]
• [event: Page.request]
• [event: Page.response]
• [method: Page.waitForRequest]
• [method: Page.waitForResponse]

Handle requests

await page.route('**/api/fetch_data', route => route.fulfill({
  status: 200,
  body: testData,
}));
await page.goto('https://example.com');

await page.route(
    "**/api/fetch_data",
    lambda route: route.fulfill(status=200, body=test_data))
await page.goto("https://example.com")

page.route(
    "**/api/fetch_data",
    lambda route: route.fulfill(status=200, body=test_data))
page.goto("https://example.com")

You can mock API endpoints via handling the network quests in your Playwright script.

Variations

// Set up route on the entire browser context.
// It will apply to popup windows and opened links.

await browserContext.route('**/api/login', route => route.fulfill({
  status: 200,
  body: 'accept',
}));
await page.goto('https://example.com');

# Set up route on the entire browser context.
# It will apply to popup windows and opened links.
await context.route(
    "**/api/login",
    lambda route: route.fulfill(status=200, body="accept"))
await page.goto("https://example.com")

# Set up route on the entire browser context.
# It will apply to popup windows and opened links.
context.route(
    "**/api/login",
    lambda route: route.fulfill(status=200, body="accept"))
page.goto("https://example.com")

API reference

• [method: BrowserContext.route]
• [method: BrowserContext.unroute]
• [method: Page.route]
• [method: Page.unroute]
• [Route]

Modify requests

// Delete header
await page.route('**/*', route => {
  const headers = route.request().headers();
  delete headers['X-Secret'];
  route.continue({headers});
});

// Continue requests as POST.
await page.route('**/*', route => route.continue({method: 'POST'}));

# Delete header
async def handle_route(route):
    headers = route.request.headers
    del headers["x-secret"]
    route.continue_(headers=headers)
await page.route("**/*", handle_route)

# Continue requests as POST.
await page.route("**/*", lambda route: route.continue_(method="POST"))

# Delete header
def handle_route(route):
    headers = route.request.headers
    del headers["x-secret"]
    route.continue_(headers=headers)
page.route("**/*", handle_route)

# Continue requests as POST.
page.route("**/*", lambda route: route.continue_(method="POST"))

You can continue requests with modifications. Example above removes an HTTP header from the outgoing requests.

Abort requests

await page.route('**/*.{png,jpg,jpeg}', route => route.abort());

// Abort based on the request type
await page.route('**/*', route => {
  return route.request().resourceType() === 'image' ?
      route.abort() : route.continue();
});

await page.route("**/*.{png,jpg,jpeg}", lambda route: route.abort())

# Abort based on the request type
await page.route("**/*", lambda route: route.abort() if route.request.resource_type == "image"  else route.continue_())

page.route("**/*.{png,jpg,jpeg}", lambda route: route.abort())

# Abort based on the request type
page.route("**/*", lambda route: route.abort() if route.request.resource_type == "image"  else route.continue_())

API reference

• [method: Page.route]
• [method: BrowserContext.route]
• [method: Route.abort]