playwright/docs/network.md

<!-- THIS FILE IS NOW GENERATED -->

# Network

Playwright provides APIs to **monitor** and **modify** network traffic, both
HTTP and HTTPS. Any requests that page does, including
[XHRs](https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest) and
[fetch](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API) requests,
can be tracked, modified and handled.

<!-- GEN:toc-top-level -->
- [HTTP Authentication](#http-authentication)
- [Handle file downloads](#handle-file-downloads)
- [Network events](#network-events)
- [Handle requests](#handle-requests)
- [Modify requests](#modify-requests)
- [Abort requests](#abort-requests)
<!-- GEN:stop -->

<br/>

## HTTP Authentication

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

#### API reference
- [browser.newContext([options])](./api.md#browsernewcontextoptions)

<br/>

## Handle file downloads

```js
const [ download ] = await Promise.all([
  page.waitForEvent('download'), // <-- start waiting for the download
  page.click('button#delayed-download') // <-- perform the action that directly or indirectly initiates it.
]);
const path = await download.path();
```

For every attachment downloaded by the page,
[page.on('download')](./api.md#pageondownload) event is emitted. If you create a
browser context with the `acceptDownloads: true`, all these attachments are
going to be downloaded into a temporary folder. You can obtain the download url,
file system path and payload stream using the [Download] object from the event.

#### Variations

If you have no idea what initiates the download, you can still handle the event:

```js
page.on('download', download => download.path().then(console.log));
```

Note that handling the event forks the control flow and makes script harder to
follow. Your scenario might end while you are downloading a file since your main
control flow is not awaiting for this operation to resolve.

#### API reference
- [Download]
- [page.on('download')](./api.md#pageondownload)
- [page.waitForEvent(event[, optionsOrPredicate])](./api.md#pagewaitforeventevent-optionsorpredicate)

<br/>

## Network events

You can monitor all the requests and responses:

```js
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();
})();
```

Or wait for a network response after the button click:

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

#### Variations

```js
// 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'),
]);
```

#### API reference
- [Request]
- [Response]
- [page.on('request')](./api.md#pageonrequest)
- [page.on('response')](./api.md#pageonresponse)
- [page.waitForRequest(urlOrPredicate[, options])](./api.md#pagewaitforrequesturlorpredicate-options)
- [page.waitForResponse(urlOrPredicate[, options])](./api.md#pagewaitforresponseurlorpredicate-options)

<br/>

## Handle requests

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

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

#### Variations

```js
// 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');
```

#### API reference
- [browserContext.route(url, handler)](./api.md#browsercontextrouteurl-handler)
- [browserContext.unroute(url[, handler])](./api.md#browsercontextunrouteurl-handler)
- [page.route(url, handler)](./api.md#pagerouteurl-handler)
- [page.unroute(url[, handler])](./api.md#pageunrouteurl-handler)
- [Route]

<br/>

## Modify requests

```js
// 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'}));
```

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

## Abort requests

```js
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();
});
```

#### API reference
- [page.route(url, handler)](./api.md#pagerouteurl-handler)
- [browserContext.route(url, handler)](./api.md#browsercontextrouteurl-handler)
- [route.abort([errorCode])](./api.md#routeaborterrorcode)

<br/>
[Playwright]: api.md#class-playwright "Playwright"
[Browser]: api.md#class-browser "Browser"
[BrowserContext]: api.md#class-browsercontext "BrowserContext"
[Page]: api.md#class-page "Page"
[Frame]: api.md#class-frame "Frame"
[ElementHandle]: api.md#class-elementhandle "ElementHandle"
[JSHandle]: api.md#class-jshandle "JSHandle"
[ConsoleMessage]: api.md#class-consolemessage "ConsoleMessage"
[Dialog]: api.md#class-dialog "Dialog"
[Download]: api.md#class-download "Download"
[Video]: api.md#class-video "Video"
[FileChooser]: api.md#class-filechooser "FileChooser"
[Keyboard]: api.md#class-keyboard "Keyboard"
[Mouse]: api.md#class-mouse "Mouse"
[Touchscreen]: api.md#class-touchscreen "Touchscreen"
[Request]: api.md#class-request "Request"
[Response]: api.md#class-response "Response"
[Selectors]: api.md#class-selectors "Selectors"
[Route]: api.md#class-route "Route"
[WebSocket]: api.md#class-websocket "WebSocket"
[TimeoutError]: api.md#class-timeouterror "TimeoutError"
[Accessibility]: api.md#class-accessibility "Accessibility"
[Worker]: api.md#class-worker "Worker"
[BrowserServer]: api.md#class-browserserver "BrowserServer"
[BrowserType]: api.md#class-browsertype "BrowserType"
[Logger]: api.md#class-logger "Logger"
[ChromiumBrowser]: api.md#class-chromiumbrowser "ChromiumBrowser"
[ChromiumBrowserContext]: api.md#class-chromiumbrowsercontext "ChromiumBrowserContext"
[ChromiumCoverage]: api.md#class-chromiumcoverage "ChromiumCoverage"
[CDPSession]: api.md#class-cdpsession "CDPSession"
[FirefoxBrowser]: api.md#class-firefoxbrowser "FirefoxBrowser"
[WebKitBrowser]: api.md#class-webkitbrowser "WebKitBrowser"
[Array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array "Array"
[Buffer]: https://nodejs.org/api/buffer.html#buffer_class_buffer "Buffer"
[ChildProcess]: https://nodejs.org/api/child_process.html "ChildProcess"
[Element]: https://developer.mozilla.org/en-US/docs/Web/API/element "Element"
[Error]: https://nodejs.org/api/errors.html#errors_class_error "Error"
[EvaluationArgument]: #evaluationargument "Evaluation Argument"
[Map]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map "Map"
[Object]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object "Object"
[Promise]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise "Promise"
[RegExp]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp "RegExp"
[Serializable]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify#Description "Serializable"
[UIEvent.detail]: https://developer.mozilla.org/en-US/docs/Web/API/UIEvent/detail "UIEvent.detail"
[URL]: https://nodejs.org/api/url.html "URL"
[USKeyboardLayout]: ../src/usKeyboardLayout.ts "USKeyboardLayout"
[UnixTime]: https://en.wikipedia.org/wiki/Unix_time "Unix Time"
[boolean]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type "Boolean"
[function]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function "Function"
[iterator]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols "Iterator"
[null]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/null "null"
[number]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type "Number"
[origin]: https://developer.mozilla.org/en-US/docs/Glossary/Origin "Origin"
[selector]: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Selectors "selector"
[Readable]: https://nodejs.org/api/stream.html#stream_class_stream_readable "Readable"
[string]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type "string"
[xpath]: https://developer.mozilla.org/en-US/docs/Web/XPath "xpath"