microsoft/playwright · error · Error

Unknown method: ${message.method}

Error message

Unknown method: ${message.method}

What it means

Error "Unknown method: ${message.method}" thrown in microsoft/playwright.

Source

Thrown at packages/extension/src/relayConnection.ts:226

      this._sendError(-32700, `Error parsing message: ${error.message}`);
      return;
    }

    const response: ProtocolResponse = {
      id: message.id,
    };
    try {
      response.result = await this._handleCommand(message);
    } catch (error: any) {
      debugLog(`Error handling command ${JSON.stringify(message)}:`, error);
      response.error = error.message;
    }
    this._sendMessage(response);
  }

  private async _handleCommand(message: ProtocolCommand): Promise<any> {
    if (!ALLOWED_CHROME_COMMANDS.has(message.method))
      throw new Error(`Unknown method: ${message.method}`);
    const args = (message.params ?? []) as any[];
    const result = await invokeChromeMethod(message.method, args);
    // Attach bookkeeping; detach flows through the chrome.debugger.onDetach event.
    if (message.method === 'chrome.debugger.attach') {
      const target = args[0] as chrome.debugger.Debuggee | undefined;
      if (target?.tabId !== undefined)
        this._notifyTabAttached(target.tabId);
    }
    return result ?? {};
  }

  private _sendError(code: number, message: string): void {
    this._sendMessage({
      error: {
        code,
        message,
      },
    });

View on GitHub (pinned to c8fc3bf8d3)

When it happens

Trigger: Thrown at packages/extension/src/relayConnection.ts:226 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of microsoft/playwright@c8fc3bf8d3 (2026-08-12). Data as JSON: /api/errors/90b9eadf65e9cf08. Report an issue: GitHub.