chore: route.fetch(postData) (#19436)

docs/src/api/class-route.md

@@ -115,7 +115,7 @@ If set changes the request method (e.g. GET or POST).
 ### option: Route.continue.postData
 * since: v1.8
 * langs: js, python, java
-- `postData` <[string]|[Buffer]>
+- `postData` <[string]|[Buffer]|[Serializable]>
 
 If set changes the post data of request.
 
@@ -391,7 +391,7 @@ If set changes the request method (e.g. GET or POST).
 ### option: Route.fallback.postData
 * since: v1.23
 * langs: js, python, java
-- `postData` <[string]|[Buffer]>
+- `postData` <[string]|[Buffer]|[Serializable]>
 
 If set changes the post data of request.
 
@@ -480,10 +480,10 @@ If set changes the request URL. New URL must have same protocol as original one.
 
 If set changes the request method (e.g. GET or POST).
 
-### option: Route.fetch.postData = %%-js-python-csharp-fetch-option-data-%%
+### option: Route.fetch.postData = %%-js-python-csharp-fetch-option-post-data-%%
 * since: v1.29
 
-### option: Route.fetch.data
+### option: Route.fetch.postData
 * since: v1.29
 * langs: csharp
 - `postData` <[Buffer]>
@@ -616,33 +616,6 @@ Optional response body as raw bytes.
 
 JSON response. This method will set the content type to `application/json` if not set.
 
-**Usage**
-
-```js
-await page.route('https://dog.ceo/api/breeds/list/all', async route => {
-  const json = {
-    message: { 'test_breed': [] }
-  };
-  await route.fulfill({ json });
-});
-```
-
-```python async
-async def handle(route):
-    json = { "test_breed": [] }
-    await route.fulfill(json=json)
-
-await page.route("https://dog.ceo/api/breeds/list/all", handle)
-```
-
-```python sync
-async def handle(route):
-    json = { "test_breed": [] }
-    route.fulfill(json=json)
-
-page.route("https://dog.ceo/api/breeds/list/all", handle)
-```
-
 ### option: Route.fulfill.json
 * since: v1.29
 * langs: csharp

docs/src/api/params.md

@@ -389,6 +389,14 @@ Allows to set post data of the request. If the data parameter is an object, it w
 and `content-type` header will be set to `application/json` if not explicitly set. Otherwise the `content-type` header will be
 set to `application/octet-stream` if not explicitly set.
 
+## js-python-csharp-fetch-option-post-data
+* langs: js, python, csharp
+- `postData` <[string]|[Buffer]|[Serializable]>
+
+Allows to set post data of the request. If the data parameter is an object, it will be serialized to json string
+and `content-type` header will be set to `application/json` if not explicitly set. Otherwise the `content-type` header will be
+set to `application/octet-stream` if not explicitly set.
+
 ## js-python-csharp-fetch-option-ignorehttpserrors
 * langs: js, python, csharp
 - `ignoreHTTPSErrors` <[boolean]>

packages/playwright-core/src/client/network.ts

@@ -32,6 +32,7 @@ import type { HeadersArray, URLMatch } from '../common/types';
 import { urlMatches } from '../common/netUtils';
 import { MultiMap } from '../utils/multimap';
 import { APIResponse } from './fetch';
+import type { Serializable } from '../../types/structs';
 
 export type NetworkCookie = {
   name: string,
@@ -56,11 +57,18 @@ export type SetNetworkCookieParam = {
   sameSite?: 'Strict' | 'Lax' | 'None'
 };
 
+type SerializedFallbackOverrides = {
+  url?: string;
+  method?: string;
+  headers?: Headers;
+  postDataBuffer?: Buffer;
+};
+
 type FallbackOverrides = {
   url?: string;
   method?: string;
   headers?: Headers;
-  postData?: string | Buffer;
+  postData?: string | Buffer | Serializable;
 };
 
 export class Request extends ChannelOwner<channels.RequestChannel> implements api.Request {
@@ -71,7 +79,7 @@ export class Request extends ChannelOwner<channels.RequestChannel> implements ap
   private _actualHeadersPromise: Promise<RawHeaders> | undefined;
   private _postData: Buffer | null;
   _timing: ResourceTiming;
-  private _fallbackOverrides: FallbackOverrides = {};
+  private _fallbackOverrides: SerializedFallbackOverrides = {};
 
   static from(request: channels.RequestChannel): Request {
     return (request as any)._object;
@@ -114,17 +122,14 @@ export class Request extends ChannelOwner<channels.RequestChannel> implements ap
   }
 
   postData(): string | null {
-    if (this._fallbackOverrides.postData)
+    if (this._fallbackOverrides.postDataBuffer)
-      return this._fallbackOverrides.postData.toString('utf-8');
+      return this._fallbackOverrides.postDataBuffer.toString('utf-8');
     return this._postData ? this._postData.toString('utf8') : null;
   }
 
   postDataBuffer(): Buffer | null {
-    if (this._fallbackOverrides.postData) {
+    if (this._fallbackOverrides.postDataBuffer)
-      if (isString(this._fallbackOverrides.postData))
+      return this._fallbackOverrides.postDataBuffer;
-        return Buffer.from(this._fallbackOverrides.postData, 'utf-8');
-      return this._fallbackOverrides.postData;
-    }
     return this._postData;
   }
 
@@ -251,7 +256,21 @@ export class Request extends ChannelOwner<channels.RequestChannel> implements ap
   }
 
   _applyFallbackOverrides(overrides: FallbackOverrides) {
-    this._fallbackOverrides = { ...this._fallbackOverrides, ...overrides };
+    const basicOptions = { ...overrides, postData: undefined };
+
+    const postData = overrides.postData;
+    let postDataBuffer = this._fallbackOverrides.postDataBuffer;
+    if (isString(postData))
+      postDataBuffer = Buffer.from(postData, 'utf-8');
+    else if (postData instanceof Buffer)
+      postDataBuffer = postData;
+    else if (postData)
+      postDataBuffer = Buffer.from(JSON.stringify(postData), 'utf-8');
+    this._fallbackOverrides = {
+      ...this._fallbackOverrides,
+      ...basicOptions,
+      postDataBuffer,
+    };
   }
 
   _fallbackOverridesForContinue() {
@@ -400,12 +419,11 @@ export class Route extends ChannelOwner<channels.RouteChannel> implements api.Ro
   async _innerContinue(internal = false) {
     const options = this.request()._fallbackOverridesForContinue();
     return await this._wrapApiCall(async () => {
-      const postDataBuffer = isString(options.postData) ? Buffer.from(options.postData, 'utf8') : options.postData;
       await this._raceWithTargetClose(this._channel.continue({
         url: options.url,
         method: options.method,
         headers: options.headers ? headersObjectToArray(options.headers) : undefined,
-        postData: postDataBuffer,
+        postData: options.postDataBuffer,
       }));
     }, !!internal);
   }

packages/playwright-core/types/types.d.ts

@@ -17067,7 +17067,7 @@ export interface Route {
     /**
      * If set changes the post data of request.
      */
-    postData?: string|Buffer;
+    postData?: string|Buffer|Serializable;
 
     /**
      * If set changes the request URL. New URL must have same protocol as original one.
@@ -17154,7 +17154,7 @@ export interface Route {
     /**
      * If set changes the post data of request.
      */
-    postData?: string|Buffer;
+    postData?: string|Buffer|Serializable;
 
     /**
      * If set changes the request URL. New URL must have same protocol as original one. Changing the URL won't affect the
@@ -17181,13 +17181,6 @@ export interface Route {
    * @param options
    */
   fetch(options?: {
-    /**
-     * Allows to set post data of the request. If the data parameter is an object, it will be serialized to json string
-     * and `content-type` header will be set to `application/json` if not explicitly set. Otherwise the `content-type`
-     * header will be set to `application/octet-stream` if not explicitly set.
-     */
-    data?: string|Buffer|Serializable;
-
     /**
      * If set changes the request HTTP headers. Header values will be converted to a string.
      */
@@ -17198,6 +17191,13 @@ export interface Route {
      */
     method?: string;
 
+    /**
+     * Allows to set post data of the request. If the data parameter is an object, it will be serialized to json string
+     * and `content-type` header will be set to `application/json` if not explicitly set. Otherwise the `content-type`
+     * header will be set to `application/octet-stream` if not explicitly set.
+     */
+    postData?: string|Buffer|Serializable;
+
     /**
      * If set changes the request URL. New URL must have same protocol as original one.
      */
@@ -17247,18 +17247,6 @@ export interface Route {
 
     /**
      * JSON response. This method will set the content type to `application/json` if not set.
-     *
-     * **Usage**
-     *
-     * ```js
-     * await page.route('https://dog.ceo/api/breeds/list/all', async route => {
-     *   const json = {
-     *     message: { 'test_breed': [] }
-     *   };
-     *   await route.fulfill({ json });
-     * });
-     * ```
-     *
      */
     json?: Serializable;
 

tests/page/page-request-fallback.spec.ts

@@ -259,4 +259,22 @@ it.describe('post data', () => {
       expect(postDataBuffer[i]).toBe(arr[i]);
     }
   });
+
+  it('should amend json post data', async ({ page, server }) => {
+    await page.goto(server.EMPTY_PAGE);
+    let postData: string;
+    await page.route('**/*', route => {
+      postData = route.request().postDataJSON();
+      route.continue();
+    });
+    await page.route('**/*', route => {
+      route.fallback({ postData: { foo: 'bar' } });
+    });
+    const [serverRequest] = await Promise.all([
+      server.waitForRequest('/sleep.zzz'),
+      page.evaluate(() => fetch('/sleep.zzz', { method: 'POST', body: 'birdy' }))
+    ]);
+    expect(postData).toEqual({ foo: 'bar' });
+    expect((await serverRequest.postBody).toString('utf8')).toBe('{"foo":"bar"}');
+  });
 });

tests/page/page-request-intercept.spec.ts

@@ -224,7 +224,7 @@ it('should intercept with post data override', async ({ page, server, isElectron
   const requestPromise = server.waitForRequest('/empty.html');
   await page.route('**/*.html', async route => {
     const response = await route.fetch({
-      data: { 'foo': 'bar' },
+      postData: { 'foo': 'bar' },
     });
     await route.fulfill({ response });
   });