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If you want to call external API from the plugin you need to use Newtonsoft.Json . You can use the below code. Note that in IP URL it is not working but it works with domain name URL: static async Task<bool> CallExternalAPI(Guid beziehungId) { //works bool status = false; HttpClient apiClient = new HttpClient(); apiClient.DefaultRequestHeaders.Accept.Clear(); apiClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json")); string url = @"https://reqres.in/api/users?page=2"; // Workin version test API URL HttpResponseMessage response = await apiClient.GetAsync(url); if (response.IsSuccessStatusCode) { var result = response.Content.ReadAsStringAsync().GetAwaiter().GetResult(); } return status; }