chore(fetch): pass flush and finishFlush options to brotli (#31833)

Fixes https://github.com/microsoft/playwright/issues/31814

packages/playwright-core/src/server/fetch.ts

@@ -422,7 +422,10 @@ export abstract class APIRequestContext extends SdkObject {
             finishFlush: zlib.constants.Z_SYNC_FLUSH
           });
         } else if (encoding === 'br') {
-          transform = zlib.createBrotliDecompress();
+          transform = zlib.createBrotliDecompress({
+            flush: zlib.constants.BROTLI_OPERATION_FLUSH,
+            finishFlush: zlib.constants.BROTLI_OPERATION_FLUSH
+          });
         } else if (encoding === 'deflate') {
           transform = zlib.createInflate();
         }

tests/library/browsercontext-fetch-algorithms.spec.ts

@@ -0,0 +1,98 @@
+/**
+ * Copyright (c) 2014-present Matt Zabriskie
+ * Modifications copyright (c) Microsoft Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+import { contextTest as it, expect } from '../config/browserTest';
+import util from 'util';
+import zlib from 'zlib';
+
+const gzip = util.promisify(zlib.gzip);
+const deflate = util.promisify(zlib.deflate);
+const brotliCompress = util.promisify(zlib.brotliCompress);
+
+it.skip(({ mode }) => mode !== 'default');
+
+it.describe('algorithms', () => {
+  const responseBody = 'str';
+
+  for (const [type, zipped] of Object.entries({
+    gzip: gzip(responseBody),
+    deflate: deflate(responseBody),
+    br: brotliCompress(responseBody)
+  })) {
+    it.describe(`${type} decompression`, () => {
+      it(`should support decompression`, async ({ context, server }) => {
+        server.setRoute('/compressed', async (req, res) => {
+          res.setHeader('Content-Encoding', type);
+          res.end(await zipped);
+        });
+
+        const response = await context.request.get(server.PREFIX + '/compressed');
+        expect(await response.text()).toEqual(responseBody);
+      });
+
+      it(`should not fail if response content-length header is missing (${type})`, async ({ context, server }) => {
+        server.setRoute('/compressed', async (req, res) => {
+          res.setHeader('Content-Encoding', type);
+          res.removeHeader('Content-Length');
+          res.end(await zipped);
+        });
+
+        const response = await context.request.get(server.PREFIX + '/compressed');
+        expect(await response.text()).toEqual(responseBody);
+      });
+
+      it('should not fail with chunked responses (without Content-Length header)', async ({ context, server }) => {
+        server.setRoute('/compressed', async (req, res) => {
+          res.setHeader('Content-Encoding', type);
+          res.setHeader('Transfer-Encoding', 'chunked');
+          res.removeHeader('Content-Length');
+          res.write(await zipped);
+          res.end();
+        });
+
+        const response = await context.request.get(server.PREFIX + '/compressed');
+        expect(await response.text()).toEqual(responseBody);
+      });
+
+      it('should not fail with an empty response without content-length header (Z_BUF_ERROR)', async ({ context, server }) => {
+        server.setRoute('/compressed', async (req, res) => {
+          res.setHeader('Content-Encoding', type);
+          res.removeHeader('Content-Length');
+          res.end();
+        });
+
+        const response = await context.request.get(server.PREFIX + '/compressed');
+        expect(await response.text()).toEqual('');
+      });
+
+      it('should not fail with an empty response with content-length header (Z_BUF_ERROR)', async ({ context, server }) => {
+        server.setRoute('/compressed', async (req, res) => {
+          res.setHeader('Content-Encoding', type);
+          res.end();
+        });
+
+        await context.request.get(server.PREFIX + '/compressed');
+      });
+    });
+  }
+});