Getting 403 status while fetching data from ASP.Net Web Api

Question

I am fetching WEB.API from xamarin forms application.Web API created in .Net Web API. But i am getting error

{StatusCode: 403, ReasonPhrase: 'ModSecurity Action', Version: 1.1, Content: System.Net.Http.StreamContent, Headers:
{
Server: Microsoft-IIS/8.5
X-Powered-By: ASP.NET
X-Powered-By-Plesk: PleskWin
Date: Sat, 02 Sep 2017 07:59:38 GMT
Content-Type: text/html
Content-Length: 2684
}}

Same URL is giving proper output from Browser and postman also. I am using below code to fetch web api. I am not getting exactly what happening.

string RestUrl = "http://msystemtest.msystem.co/api/Users?userId={0}&pass={1}";

            var uri = new Uri(string.Format(RestUrl, uid, pass));
            string resp = string.Empty;

            var response = await client.GetAsync(uri);

            string statHold = string.Empty;
            if(response.IsSuccessStatusCode)
            {
                var content = await response.Content.ReadAsStringAsync();
                 resp = JsonConvert.DeserializeObject<string>(content);
            }

If "http://msystemtest.msystem.co/api/Users?userId=test&pass=1" this URL directly run from browser and from postman its giving proper output.

Have you checked the uri result? Maybe the format has wrong input parameters — Stefan
– Stefan, Commented Sep 2, 2017 at 8:11
Format is right. I have tested URI result directly. Its working fine. — Akash Rekalwar
– Akash Rekalwar, Commented Sep 2, 2017 at 8:13

devzero · Accepted Answer · 2017-09-02 08:30:11Z

2

Seems like the server does not like you reading this from a non browser. Here is code to emulate a browser from a console application:

using System;
using System.Net.Http;
namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            using (var httpClient = new HttpClient())
            {
                httpClient.DefaultRequestHeaders.TryAddWithoutValidation("Accept", "application/json");
                httpClient.DefaultRequestHeaders.TryAddWithoutValidation("User-Agent", "Mozilla/5.0 (Windows NT 6.2; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0");

                var response = httpClient.GetAsync("http://msystemtest.msystem.co/api/Users?userId=test&pass=1").Result;
                Console.WriteLine(response.Content.ReadAsStringAsync().Result);
                Console.ReadKey();
            }
        }
    }
}

answered Sep 2, 2017 at 8:30

devzero

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3 Comments

Akash Rekalwar Over a year ago

Its working fine from console application. But when I try to implement from Xamarin Forms application it is giving same status.

devzero Over a year ago

Try using fiddler to check that the Xamarin Forms application does not overwrite the user-agent heading

Akash Rekalwar Over a year ago

Its working fine by slight changes in code. Thanks for your assist.

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