Gateway Error in mendix

Hi All, I had done the microflow with Call REST activity to show the values in data grid. In microflow I had given the progress message and also microflow type as asynchronous. Once the microflow is done, I should get the show page activity to  show the values in data grid.  But the problem is after the progress message is shown I’m not getting the values in grid. It is showing the error as 504 gateway error. Can you please tell me how to handle the 504 gateway error in mendix? Appreciate your help.
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