Can't get it to work: C# Console App Refreshing ESI Token

[ParaPants]

I could use some help please. I am trying to create a C# console app that gets an access key from a refresh token. Obviously my end program does far more, but I’m stuck here. I obtained the refresh key from postman, so this is my first attempt to use c# to interact with EvE ESI. Here is my code:

using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        static HttpClient client = new HttpClient();

        static async Task RunAsync()
        {
            string clientid = "<<client_id>>";
            string secret = "<<secret>>";
            string auth_header = $"{clientid}:{secret}";
            string auth_header_64 = $"Basic {Convert.ToBase64String(Encoding.UTF8.GetBytes(auth_header))}";
            string refreshtoken = "<<refresh Token>>";

            client.DefaultRequestHeaders.Accept.Clear();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/x-www-form-urlencoded"));
            client.DefaultRequestHeaders.Clear();
            client.DefaultRequestHeaders.Add("Authorization", auth_header_64);

            HttpResponseMessage response;
            try 
            {
                response = await client.GetAsync($"https://login.eveonline.com/oauth/token?grant_type=refresh_token&refresh_token={refreshtoken}");
                if (!response.IsSuccessStatusCode)
                {
                    Console.WriteLine("Error refreshing token");
                    Console.WriteLine(response.ToString());
                    return;
                }
                string data = await response.Content.ReadAsStringAsync();
                Console.WriteLine(data);

            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }

        static void Main(string[] args)
        {
            RunAsync().GetAwaiter().GetResult();
        }
    }
}

Here is the response that I am getting:

Error refreshing token
StatusCode: 404, ReasonPhrase: 'Not Found', Version: 1.1, Content: System.Net.Http.HttpConnection+HttpConnectionResponseContent, Headers:
{
  Cache-Control: private
  Server: Microsoft-IIS/10.0
  Date: Mon, 22 Apr 2019 03:19:24 GMT
  Content-Type: text/html
  Content-Length: 0
}

Thank you in advance for your help.

[Qia_Kare]

Are you sure you’re using the right ESI url? Last I was told it was esi.evetech.net, but you appear to be using login.eveonline.com, which is the URL for the SSO service rather than ESI.

[Golden_Gnu]

I’m not sure why you’re getting the error, but, you’re if you’re not getting a json errors back, you’re most likely not sending everything you need to send or sending it to the wrong place, SSO should be returning json errors on failure.

I will also strongly suggest that you use a library instead of reinventing the wheel:

devfleet/awesome-eve

In case you insist on doing it yourself, then SSO is documented in the ESI docs:

esi/esi-docs

[Captain_Panther]

You can look here for a working example: https://github.com/panthernet/ThunderED/blob/1.3.8/ThunderED/API/ESIAPI.cs

Line 215 RefreshToken() method

[Blacksmoke16]

@ParaPants I don’t’ fully know C#, however it seems you are doing a GET request, when it should be POST request?

The request should be a POST with x-www-form-urlencoded data as the POST body.

POST https://login.eveonline.com/oauth/token HTTP/1.1

Content-Type: application/x-www-form-urlencoded
Host: login.eveonline.com
Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l  

grant_type=refresh_token&refresh_token=gEy...fM0

@Qia_Kare esi.evetech.net is the base URL for ESI. When dealing with the SSO flow, login.eveonline.com is the correct host since he is trying to refresh a token.