test .net core 2 page using Postman return 400 bad request

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I created default project template of .net core 2 pages , than I'm trying to test a call to a page OnPostAsync (not api controller) using postman , but I always get 400 bad request , tried to play with headers etc` but with no success , any 1 manage to do this?
After this will work ,my goal is to do do end-to-end/load tests

thanks!

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