Restapi aspnet core error 400

Question

I am trying to consume a third party webservice in my controller, but I need to do an authentication with username and password and pass another parameter in the POST but in every way I did returns error 400 as if my parameters were not going, Does anyone have an example for me? I’m using aspnet core 1.0

For example, this was a method I tried:

using (var client = new HttpClient())
{
    client.BaseAddress = new Uri(apiBaseUri);
    client.DefaultRequestHeaders.Accept.Clear();
    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

    var formContent = new FormUrlEncodedContent(new[]
    {
         new KeyValuePair<string, string>("grant_type", "client_credentials"),
         new KeyValuePair<string, string>("username", userName),
         new KeyValuePair<string, string>("password", password),
     });

    //send request
    HttpResponseMessage responseMessage = await client.PostAsync("/token", formContent);

    if(responseMessage.StatusCode == HttpStatusCode.OK)
    {
        //get access token from response body
        var responseJson = await responseMessage.Content.ReadAsStringAsync();
        var jObject = JObject.Parse(responseJson);
        return jObject.GetValue("access_token").ToString();
    }
    else
    {
        return null;
    }

}

This is the error that presents:

{StatusCode: 400, ReasonPhrase: 'Bad Request', Version: 1.1, Content: System.Net.Http.StreamContent, Headers:
{
  Connection: close
  Connection: close
  Date: Tue, 25 Oct 2016 12:21:53 GMT
  Server: Apache
  Set-Cookie: X-PP-SILOVER=name%3DSANDBOX3.API.1%26silo_version%3D1880%26app%3Dplatformapiserv%26TIME%3D1632505688%26HTTP_X_PP_AZ_LOCATOR%3D; Expires=Tue, 25 Oct 2016 12:51:53 GMT; domain=.paypal.com; path=/; Secure; HttpOnly
  Set-Cookie: X-PP-SILOVER=; Expires=Thu, 01 Jan 1970 00:00:01 GMT
  PROXY_SERVER_INFO: host=slcsbplatformapiserv3001.slc.paypal.com;threadId=842
  Paypal-Debug-Id: 41e81ada72ff1
  Paypal-Debug-Id: 41e81ada72ff1
  CORRELATION-ID: 41e81ada72ff1
  X-PAYPAL-TOKEN-SERVICE: IAAS
  Content-Length: 79
  Content-Type: application/json
}}

And the code generated by Postman with Restsharp is:

    var client = new RestClient(uri);
    var request = new RestRequest(Method.POST);
    request.AddHeader("postman-token", token);
    request.AddHeader("cache-control", "no-cache");
    request.AddHeader("authorization", "Basic   username:password");
    request.AddHeader("content-type", "application/x-www-form-urlencoded");
    request.AddParameter("application/x-www-form-urlencoded", "grant_type=client_credentials", ParameterType.RequestBody);
    IRestResponse response = client.Execute(request);`

Answer 1

I was able to change the authentication by passing to the header and leaving only the parameter, the correct code was like this:

    using (var client = new HttpClient())
        {
            client.BaseAddress = new Uri(apiBaseUri);
            client.DefaultRequestHeaders.Accept.Clear();                
            client.DefaultRequestHeaders.Add("authorization", "Basic username:password");

            var formContent = new FormUrlEncodedContent(new[]
            {
                 new KeyValuePair<string, string>("grant_type", "client_credentials")
             });

            //send request
            HttpResponseMessage responseMessage = await client.PostAsync("/token", formContent);

            if(responseMessage.StatusCode == HttpStatusCode.OK)
            {
                var responseJson = await responseMessage.Content.ReadAsStringAsync();
                var jObject = JObject.Parse(responseJson);
                return jObject.GetValue("access_token").ToString();
            }
            else
            {
                return null;
            }

        }