Support Article
Error displays in the browser console after upgrade
SA-64328
Summary
Error displays in the browser console after upgrade.
Error Messages
Error during WebSocket handshake: Unexpected response code: 501
Steps to Reproduce
- Log in to Designer Studio
- Open the browser console by clicking the F12 Key
Root Cause
A defect or configuration issue in the operating environment.
Resolution
Perform the following local-change:- Add the following Dynamic System Setting (DSS) if the Webserver version does not support WebSockets:
Owning Ruleset: Pega-Engine
Setting Purpose: prconfig/server-push/transport/default
Value: long-polling - Restart the server
The default value is 'websocket,long-polling' when the DSS is not present. With this setting, Pega only uses long-polling and does not attempt the WebSocket request.
Published September 20, 2018 - Updated December 2, 2021
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