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Support Article

Pega Web Mashup Only works on Chrome browser



User requirement is to display a Pega Web Mashup interface.
The Pega Web Mashup configuration works fine with Chrome browser, but not on Internet Explorer and Firefox browsers.


Error Messages

HTTP 400 error

Steps to Reproduce

Open page that contain Pega Web Mashup code.

Root Cause

A defect or configuration issue in the operating environment. The root cause is that the same origin policy was not respected.
The portal was an HTML file located in the Windows folder, with an Mashup gadget pointing to Prgateway in the Pega cloud.
In such case, the origin of the HTML file is seen as "null" for the HTML page and as the Pega cloud URL for the IAC gadget, hence not the same.
Browser behaves differently, more or less strict regarding this which explain the issue's different behavior.


Perform the following local-change: 

Install prgateway in the same location as the portal to ensure the same origin policy, so that the URL host, port, domain, protocol for the portal is same as the one for prgateway.
Following link provides example of valid URL combination:
Web application page URL (as seen by the web browser) Pega Gadget URL (as seen by the web browser at runtime) Valid Configuration? YES YES NO – different host name NO – different host name NO – different host name NO – different protocol NO – different port


Published June 6, 2016 - Updated December 2, 2021

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