using System;

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using System.Threading.Tasks;

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using Newtonsoft.Json;

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using RestSharp;

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public static class RestClientExtensions

{

    public static async Task<RestResponse> ExecuteAsync(this RestClient client, RestRequest request)

    {

        TaskCompletionSource<IRestResponse> taskCompletion = new TaskCompletionSource<IRestResponse>();

        RestRequestAsyncHandle handle = client.ExecuteAsync(request, r => taskCompletion.SetResult(r));

        return (RestResponse)(await taskCompletion.Task);

    }

}

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public class Function

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    {

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        public RestClient _client = new RestClient("https://ur6g.appiantrial.com/suite/webapi");

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        public async Task<RestResponse> FunctionHandler() 

        {

            RestRequest request = new RestRequest();

            try

            {

                //Prepare request

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                //request = new RestRequest(input.appian, Method.POST);

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                request.AddHeader("Authorization", "Basic bWlndWVsLm9saXZlaXJhQGlubm93YXZlLnRlY2g6TWlkWkRoZjZhMg==");

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                request.AddHeader("Content-Type", "application/json");

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                //Adding body

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                //request.AddParameter("application/json; charset=utf-8", JsonConvert.SerializeObject(input.body), ParameterType.RequestBody);

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                //Call Service 

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                //var response = await _client.Execute<T>(request).Data;

                return await RestClientExtensions.ExecuteAsync(_client, request);

                //IRestResponse<GenericResponseObject<T>> response = _client.Execute<Task<T>>(request);

                //Task<T> responseObject = response.Data;

                //return responseObject;

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            }

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            catch (Exception e)

​

            {

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                Console.WriteLine(e.Message);

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            }

            return null;

        }

}

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​