While testing the API in Developer portal not getting default fault rules error message

[priya_Edupalli]

Hello Team, 

While testing the API in the Developer portal not getting default fault rules error message getting response as "An unknown error occurred while making the request. Please verify your connection and try again. If you continue to experience issues please contact support" but when I try with Assign message policy is given related error message

we are getting errors like below when I use RaiseFault:

Access to XMLHttpRequest at 'https://apigwu.icicipruamc.com/v1/api/dp_foliocreation' from origin 'https://devu.icicipruamc.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

Find the below Add-cors Code

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<AssignMessage async="false" continueOnError="false" enabled="true" name="add-cors">
<DisplayName>add-cors</DisplayName>
<FaultRules/>
<Properties/>
<Set>
<Headers>
<Header name="Access-Control-Allow-Origin">*</Header>
<Header name="Access-Control-Allow-Headers"> origin, x-requested-with, accept, content-type, Authorization, XMLHttpRequest, www-Authenticate, ConsumerKey, ClientID,</Header>
<Header name="Access-Control-Max-Age">600</Header>
<Header name="Access-Control-Allow-Methods">GET, POST</Header>
<Header name="Access-Control-Allow-Credentials">true</Header>
<Header name="Cache-Control">no-cache</Header>
<Header name="Strict-Transport-Security">max-age=31536000; includeSubDomains; preload</Header>
</Headers>
</Set>
<IgnoreUnresolvedVariables>true</IgnoreUnresolvedVariables>
<AssignTo createNew="false" transport="http" type="response"/>
</AssignMessage>

Find the below screenshot for default rules configuration:

Kindly help on this,

Thank You,