fix(fetch): preserve error code in decompression pipeline for retry logic

When a compressed HTTP response (gzip/br/deflate) encounters a network
error like ECONNRESET during body streaming, the pipeline error callback
and body error handler were wrapping the original error in a new Error,
destroying the .code property. The retry logic in _sendRequestWithRetries
checks e.code !== 'ECONNRESET' to decide whether to retry, so retries
never happened for compressed responses.

Fix: check if the error is a network error (ECONNRESET, EPIPE,
ECONNABORTED) and pass it through unwrapped so the retry logic can see
the code. Only wrap non-network errors as decompression failures.

Author: SebTardif

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

@@ -522,10 +522,19 @@ export abstract class APIRequestContext extends SdkObject {
           // Brotli and deflate decompressors throw if the input stream is empty.
           const emptyStreamTransform = new SafeEmptyStreamTransform(notifyBodyFinished);
           body = pipeline(response, emptyStreamTransform, transform, e => {
-            if (e)
-              reject(new Error(`failed to decompress '${encoding}' encoding: ${e.message}`));
+            if (e) {
+              if (isNetworkConnectionError(e))
+                reject(e);
+              else
+                reject(new Error(`failed to decompress '${encoding}' encoding: ${e.message}`));
+            }
+          });
+          body.on('error', e => {
+            if (isNetworkConnectionError(e))
+              reject(e);
+            else
+              reject(new Error(`failed to decompress '${encoding}' encoding: ${e}`));
           });
-          body.on('error', e => reject(new Error(`failed to decompress '${encoding}' encoding: ${e}`)));
         } else {
           body.on('error', reject);
         }
@@ -804,6 +813,11 @@ function removeHeader(headers: { [name: string]: string }, name: string) {
     delete headers[existing[0]];
 }
 
+function isNetworkConnectionError(e: any): boolean {
+  const code = e?.code;
+  return code === 'ECONNRESET' || code === 'EPIPE' || code === 'ECONNABORTED';
+}
+
 function setBasicAuthorizationHeader(headers: { [name: string]: string }, credentials: HTTPCredentials) {
   const { username, password } = credentials;
   const encoded = Buffer.from(`${username || ''}:${password || ''}`).toString('base64');