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If I send get request in client script, it works.
The endpoint for get request is netsuite page.
But If I send get request in MR script it shows me NetSuite login page.
Is there any method that we can make it work please?

in general no, the map/reduce script does not have the login session

so it cant access internal netsuite pages

there are bad workarounds for suitelets, and lazy workarounds for restlets