Custom Authentication Issue

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Base Authentication with Rest API

when user enter the username and password and click login it connect to Rest API and send a response back with True or False . created an action chain with the notification and add in summary the response variable string_out and it shows true or false when user enter username and password and click login but the requirement is when the response is True it should route it to a page . but tried to apply assignment variable to map the string_out variable to a variable and then tried if conditions but