core(fix): recognize zstd as a compression algorithm

bug: #15882

core/lib/network-request.js

@@ -634,7 +634,7 @@ class NetworkRequest {
       /^content-encoding$/i,
       /^x-content-encoding-over-network$/i,
     ];
-    const compressionTypes = ['gzip', 'br', 'deflate'];
+    const compressionTypes = ['gzip', 'br', 'deflate', 'zstd'];
     return record.responseHeaders.some(header =>
       patterns.some(p => header.name.match(p)) && compressionTypes.includes(header.value)
     );

core/test/lib/network-request-test.js

@@ -389,4 +389,22 @@ describe('NetworkRequest', () => {
       })).toBe(false);
     });
   });
+
+  describe('#isContentEncoded', () => {
+    const isContentEncoded = NetworkRequest.isContentEncoded;
+
+    it('correctly identifies no compression', () => {
+      expect(isContentEncoded({responseHeaders: {}})).toBe(false);
+    });
+    it('correctly identifies brotli', () => {
+      expect(isContentEncoded({
+        responseHeaders: [{name: 'content-encoding', value: 'br'}],
+      })).toBe(true);
+    });
+    it('correctly identifies zstd', () => {
+      expect(isContentEncoded({
+        responseHeaders: [{name: 'content-encoding', value: 'zstd'}],
+      })).toBe(true);
+    });
+  });
 });