Reading HttpResponseMessage.Content throws Newtonsoft.Json.JsonReaderException when reading webapi 2 token

Question

Hi I have writen a piece of code that should login into a WebAPI 2 site from a c# desktop application everything seams to work but I get an Newtonsoft.Json.JsonReaderException with the message as follows

Error reading string. Unexpected token: StartObject. Path '', line 1, position 1.

My code is as follows.

static internal async Task<string> GetBearerToken(string siteUrl, string Username, string Password)
{
  HttpClient client = new HttpClient();
  client.BaseAddress = new Uri(siteUrl);
  client.DefaultRequestHeaders.Accept.Clear();

  HttpContent content = new StringContent("grant_type=password&username=" + Username + "&password=" + Password, Encoding.UTF8, "application/x-www-form-urlencoded");

  Task<HttpResponseMessage> responseTask = client.PostAsync("Token", content);
  HttpResponseMessage response = await responseTask;

  if (response.IsSuccessStatusCode)
  {
     Task<string> message = response.Content.ReadAsAsync<string>();

     return await message;
  }
  else
  {
     return null;
  }
}

The raw reponse message as reported by fiddler

HTTP/1.1 200 OK
Cache-Control: no-cache
Pragma: no-cache
Content-Length: 593
Content-Type: application/json;charset=UTF-8
Expires: -1
Server: Microsoft-IIS/8.0
Set-Cookie: .AspNet.Cookies=vo5b0v_43BLYlfz-rYTZ-TSGi9Rg5jSd9bvKn9693e-Kx3mMI1JVX1Sk-696f_fnPEFPRwFrNWvdMfDWUTWBElfQF3UfcUAxEE5aU5zRgI40sYKapXXnC2ucIiNKCqVsceve0cxNQYVAIr_YhMNjFLRqBX7H3BTPVKGist2AeUkWw6S4VNijx5iQhvWrAvF4xlJSznCiykNqR-QHD_ZLM5-H3GZoghrkvMpr27eXY4mLIqg4lwV2Qah0gQlXnjuWbHHZqLj5HcID1S7_OfPldBE3YqBOR2JxHLITg3yPw3lbXNkHc1UDdG9HExq0faJptz0SBqd8tIeZ7buoJTZ4LHV0TcYSEs4HZ3-Bd84XX7XeWPa5qnTaAJqXaW2FAigD38a9ASr15r5wnzWv9xQxlg; path=/; HttpOnly
X-SourceFiles: =?UTF-8?B?RDpcMDYgUHJvamVjdEphZGVcMDIgU2FuZGJveFwwNCBDbGVhbnVwIEFQSSBBY2NvdW50XENsZWFudXBBUElBY2NvdW50XFRva2Vu?=
X-Powered-By: ASP.NET
Date: Sun, 02 Mar 2014 15:22:57 GMT

{"access_token":"hM_60CprAm6DqCe7qgte1vsnih2d4j1Uy_FDlgoPkEgS_4u0__4lk5KNd0XysTktOfwMw4ffH3uaRmNaFObVnEY3yWS70hio03azUbCrFKk0VNgj31Y0_zLrd-J0ScZ4vzLdtw7KAXtNfcYySKk1EFtJRB4yYcqvobwORC3eu1VHyYInqy7kBgIhAZYE_NZ3zQrrGerZjy__zCuDdRtXO-klkFtg3dONq7cMP_TBi6xLmBjhXlhzUTKGzOrofijlkyMNHF1rx0CgWjhqEx2rJU8Hakq4Bac1pCqoLaYm91DRSrYO--ff4GWlP5wLeqZAhHIA7t17e2pyZXrUT7V1ExBeCnGkWbWoR8Y-QN8ocT7Q3xjydFd4uWSQD5B-Z1bC-nLpUrtkOGZiukl6J3aCJOqeidY6MEM4TMaJZlIp-Oc","token_type":"bearer","expires_in":1209599,"userName":"Alice",".issued":"Sun, 02 Mar 2014 15:22:57 GMT",".expires":"Sun, 16 Mar 2014 15:22:57 GMT"}

I suspect the json parser expects a different message format then it is getting. I don't want the change the webapi site so I probably have to change the client implementation. I don't what I have to change or where i have to look.

You say you get *JsonReaderException*, but post nothing about json in your question. How do you deserialize the response? — L.B, Mar 02 '14 at 17:05
I just use the ReadAsAsync() method. Nowhere do I set a specific parser. So I expect C# does this some where under the hood. I can't relate the exception to any of my code. — Sander Obdeijn, Mar 02 '14 at 17:21

score 9 · Accepted Answer · answered Mar 08 '14 at 20:49

After some intense googling I got my code working.

First thing I did was added an extra class to store the token.

class TokenResponseModel
{
    [JsonProperty("access_token")]
    public string AccessToken { get; set; }

    [JsonProperty("token_type")]
    public string TokenType { get; set; }

    [JsonProperty("expires_in")]
    public int ExpiresIn { get; set; }

    [JsonProperty("userName")]
    public string Username { get; set; }

    [JsonProperty(".issued")]
    public string IssuedAt { get; set; }

    [JsonProperty(".expires")]
    public string ExpiresAt { get; set; }
}

After that I changed my code to the following code.

static internal async Task<TokenResponseModel> GetBearerToken(string siteUrl, string Username, string Password)
{
    HttpClient client = new HttpClient();
    client.BaseAddress = new Uri(siteUrl);
    client.DefaultRequestHeaders.Accept.Clear();

    HttpContent requestContent = new StringContent("grant_type=password&username=" + Username + "&password=" + Password, Encoding.UTF8, "application/x-www-form-urlencoded");

    HttpResponseMessage responseMessage = await client.PostAsync("Token", requestContent);

    if (responseMessage.IsSuccessStatusCode)
    {
        string jsonMessage;
        using (Stream responseStream = await responseMessage.Content.ReadAsStreamAsync())
        {
            jsonMessage = new StreamReader(responseStream).ReadToEnd();
        }

        TokenResponseModel tokenResponse = (TokenResponseModel)JsonConvert.DeserializeObject(jsonMessage, typeof(TokenResponseModel));

        return tokenResponse;
    }
    else
    {
        return null;
    }
}

I can now get the bearer token from a WebAPI 2 site in my client so I can add it to future request. I hope it is helpful to someone else.

score 4 · Answer 2 · answered May 06 '15 at 11:40

4

Another way to do it is:

TokenResponseModel tokenResponse = await response.Content.ReadAsAsync<TokenResponseModel>();

answered May 06 '15 at 11:40

Lidia

131
1
5

ReadAsAsync doesn't seem to exist in System.Net.Http.HttpContent, is it an extension method? – Steven Liekens Apr 04 '19 at 10:27
`Microsoft.AspNet.WebApi.Client` package contains this legacy approach. Or use [JSON deserializing directly instead](https://stackoverflow.com/a/24052147). – Peter L Jul 08 '20 at 19:21

score 0 · Answer 3 · answered Aug 25 '20 at 06:59

wrong object to deserailize Example

Json String

{
 "status":{"code":"00","description":"Success"},
 "data":{"userId":"PPP","accessToken":"123131321"}
}

Paste Special in vs

public class Rootobject
{
    public Status status { get; set; }
    public Data data { get; set; }
}

public class Status
{
    public string code { get; set; }
    public string description { get; set; }
}

public class Data
{
    public string userId { get; set; }
    public string accessToken { get; set; }
}

Code here:

    var client = new HttpClient();
    var url = url_setting;
    var data = new { username = UserName, password = PassWord };
    var result = client.PostAsync(url, data.AsJson()).Result;            
    var resp = await result.Content.ReadAsAsync<Rootobject>();            
    return resp.data.accessToken;

Reading HttpResponseMessage.Content throws Newtonsoft.Json.JsonReaderException when reading webapi 2 token

3 Answers3