500 internal server error apigee edge 500 internal server error apigee edge 500 status code in asp net core 500 internal server error apigee edge return 500 internal server error 500 internal server error apigee edge rest get request 500 asp net web api c json de serializing exception handling in asp net web api rest get request 500 error response with problemdetails cl rest api response codes 400 vs 500