diff --git a/src/chromium/crNetworkManager.ts b/src/chromium/crNetworkManager.ts
index 656cae11ef..eea30def67 100644
--- a/src/chromium/crNetworkManager.ts
+++ b/src/chromium/crNetworkManager.ts
@@ -243,7 +243,7 @@ export class CRNetworkManager {
 
   _handleRequestRedirect(request: InterceptableRequest, responsePayload: Protocol.Network.Response) {
     const response = this._createResponse(request, responsePayload);
-    response._requestFinished(new Error('Response body is unavailable for redirect responses'));
+    response._requestFinished('Response body is unavailable for redirect responses');
     this._requestIdToRequest.delete(request._requestId);
     if (request._interceptionId)
       this._attemptedAuthentications.delete(request._interceptionId);
diff --git a/src/firefox/ffNetworkManager.ts b/src/firefox/ffNetworkManager.ts
index 708c335df4..c2341d6b19 100644
--- a/src/firefox/ffNetworkManager.ts
+++ b/src/firefox/ffNetworkManager.ts
@@ -90,7 +90,7 @@ export class FFNetworkManager {
     // Keep redirected requests in the map for future reference as redirectedFrom.
     const isRedirected = response.status() >= 300 && response.status() <= 399;
     if (isRedirected) {
-      response._requestFinished(new Error('Response body is unavailable for redirect responses'));
+      response._requestFinished('Response body is unavailable for redirect responses');
     } else {
       this._requests.delete(request._id);
       response._requestFinished();
diff --git a/src/network.ts b/src/network.ts
index d05d25b5d0..954e3874c6 100644
--- a/src/network.ts
+++ b/src/network.ts
@@ -234,8 +234,8 @@ type GetResponseBodyCallback = () => Promise<Buffer>;
 export class Response {
   private _request: Request;
   private _contentPromise: Promise<Buffer> | null = null;
-  _finishedPromise: Promise<Error | null>;
-  private _finishedPromiseCallback: any;
+  _finishedPromise: Promise<{ error?: string }>;
+  private _finishedPromiseCallback: (arg: { error?: string }) => void = () => {};
   private _status: number;
   private _statusText: string;
   private _url: string;
@@ -255,8 +255,8 @@ export class Response {
     this._request._setResponse(this);
   }
 
-  _requestFinished(error?: Error) {
-    this._finishedPromiseCallback.call(null, error || null);
+  _requestFinished(error?: string) {
+    this._finishedPromiseCallback({ error });
   }
 
   url(): string {
@@ -280,14 +280,14 @@ export class Response {
   }
 
   finished(): Promise<Error | null> {
-    return this._finishedPromise;
+    return this._finishedPromise.then(({ error }) => error ? new Error(error) : null);
   }
 
   body(): Promise<Buffer> {
     if (!this._contentPromise) {
-      this._contentPromise = this._finishedPromise.then(async error => {
+      this._contentPromise = this._finishedPromise.then(async ({ error }) => {
         if (error)
-          throw error;
+          throw new Error(error);
         return this._getResponseBodyCallback();
       });
     }
diff --git a/src/rpc/channels.ts b/src/rpc/channels.ts
index 7be70fa96d..b9333abe58 100644
--- a/src/rpc/channels.ts
+++ b/src/rpc/channels.ts
@@ -1472,7 +1472,7 @@ export type ResponseBodyResult = {
 };
 export type ResponseFinishedParams = {};
 export type ResponseFinishedResult = {
-  error?: SerializedError,
+  error?: string,
 };
 
 // ----------- ConsoleMessage -----------
diff --git a/src/rpc/client/network.ts b/src/rpc/client/network.ts
index 1937c75b58..d247a12b0c 100644
--- a/src/rpc/client/network.ts
+++ b/src/rpc/client/network.ts
@@ -19,7 +19,7 @@ import * as types from '../../types';
 import { RequestChannel, ResponseChannel, RouteChannel, RequestInitializer, ResponseInitializer, RouteInitializer } from '../channels';
 import { ChannelOwner } from './channelOwner';
 import { Frame } from './frame';
-import { normalizeFulfillParameters, headersArrayToObject, normalizeContinueOverrides, parseError } from '../serializers';
+import { normalizeFulfillParameters, headersArrayToObject, normalizeContinueOverrides } from '../serializers';
 
 export type NetworkCookie = {
   name: string,
@@ -206,7 +206,7 @@ export class Response extends ChannelOwner<ResponseChannel, ResponseInitializer>
   async finished(): Promise<Error | null> {
     const result = await this._channel.finished();
     if (result.error)
-      return parseError(result.error);
+      return new Error(result.error);
     return null;
   }
 
diff --git a/src/rpc/protocol.pdl b/src/rpc/protocol.pdl
index 491cbbac89..be45a1b545 100644
--- a/src/rpc/protocol.pdl
+++ b/src/rpc/protocol.pdl
@@ -1340,7 +1340,7 @@ interface Response
 
   command finished
     returns
-      error?: SerializedError
+      error?: string
 
 interface ConsoleMessage
   initializer
diff --git a/src/rpc/server/networkDispatchers.ts b/src/rpc/server/networkDispatchers.ts
index a8b07d2ac0..ac354d9d40 100644
--- a/src/rpc/server/networkDispatchers.ts
+++ b/src/rpc/server/networkDispatchers.ts
@@ -15,10 +15,10 @@
  */
 
 import { Request, Response, Route } from '../../network';
-import { RequestChannel, ResponseChannel, RouteChannel, ResponseInitializer, RequestInitializer, RouteInitializer, Binary, SerializedError } from '../channels';
+import { RequestChannel, ResponseChannel, RouteChannel, ResponseInitializer, RequestInitializer, RouteInitializer, Binary } from '../channels';
 import { Dispatcher, DispatcherScope, lookupNullableDispatcher, existingDispatcher } from './dispatcher';
 import { FrameDispatcher } from './frameDispatcher';
-import { headersObjectToArray, headersArrayToObject, serializeError } from '../serializers';
+import { headersObjectToArray, headersArrayToObject } from '../serializers';
 import * as types from '../../types';
 
 export class RequestDispatcher extends Dispatcher<Request, RequestInitializer> implements RequestChannel {
@@ -64,9 +64,8 @@ export class ResponseDispatcher extends Dispatcher<Response, ResponseInitializer
     });
   }
 
-  async finished(): Promise<{ error?: SerializedError }> {
-    const error = await this._object.finished();
-    return { error: error ? serializeError(error) : undefined };
+  async finished(): Promise<{ error?: string }> {
+    return await this._object._finishedPromise;
   }
 
   async body(): Promise<{ binary: Binary }> {
diff --git a/src/webkit/wkPage.ts b/src/webkit/wkPage.ts
index 0e20f19f6e..588c439c96 100644
--- a/src/webkit/wkPage.ts
+++ b/src/webkit/wkPage.ts
@@ -853,7 +853,7 @@ export class WKPage implements PageDelegate {
 
   private _handleRequestRedirect(request: WKInterceptableRequest, responsePayload: Protocol.Network.Response) {
     const response = request.createResponse(responsePayload);
-    response._requestFinished(new Error('Response body is unavailable for redirect responses'));
+    response._requestFinished('Response body is unavailable for redirect responses');
     this._requestIdToRequest.delete(request._requestId);
     this._page._frameManager.requestReceivedResponse(response);
     this._page._frameManager.requestFinished(request.request);