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Support Article

Mashup application does not load as [[ is present in request URL



Pega Web Mashup application fails to load. The Mashup tab displays a blank screen and an error occurs. In the fidder trace, '[[' displays in the request URL.

Error Messages

HTTP 400

Steps to Reproduce

  1. Log in to the application.
  2. Click Browser Refresh. A blank screen displays.
  3. Select a different account from the Select Account dropdown in the host MSP application. A blank screen displays.

Root Cause

The issue existed in @baseclass. pzGetURLHashes activity. The below Java code did not encode the URL which resulted in '[[' in the URL and HTTP 400 error.

output = "pega.web.config.tempAGHash='"+browserURL+"';";


Apply the below hotfixes for the respective Pega versions:
  • HFix-47267 - Pega 7.4
  • HFix-47420 - Pega 7.3.1
  • HFix-47421 - Pega 7.3
  • HFix-47422 - Pega 7.2.2
  • HFix-47423 - Pega 7.2 


Published October 12, 2018 - Updated December 2, 2021

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