Reading HttpResponseMessage.Content throws Newtonsoft.Json.JsonReaderException while reading webapi 2 tokens

Question

Hi, I wrote a piece of code that must go into the WebAPI 2 site from the C # desktop so that all the seams work, but I get a Newtonsoft.Json.JsonReaderException message with the message as follows

Error reading line. 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; } } 

Raw response message 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"} rYTZ-TSGi9Rg5jSd9bvKn9693e-Kx3mMI1JVX1Sk-696f_fnPEFPRwFrNWvdMfDWUTWBElfQF3UfcUAxEE5aU5zRgI40sYKapXXnC2ucIiNKCqVsceve0cxNQYVAIr_YhMNjFLRqBX7H3BTPVKGist2AeUkWw6S4VNijx5iQhvWrAvF4xlJSznCiykNqR-QHD_ZLM5-H3GZoghrkvMpr27eXY4mLIqg4lwV2Qah0gQlXnjuWbHHZqLj5HcID1S7_OfPldBE3YqBOR2JxHLITg3yPw3lbXNkHc1UDdG9HExq0faJptz0SBqd8tIeZ7buoJTZ4LHV0TcYSEs4HZ3-Bd84XX7XeWPa5qnTaAJqXaW2FAigD38a9ASr15r5wnzWv9xQxlg; 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 json parser is expecting a different message format that it receives. I do not want to change the webapi site, so I will probably have to change the client implementation. I am not what I need to change or where I should look.

Answer 1

After some intense googling, I got my code.

First of all, I added an additional class for storing 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; } } 

Now I can get the carrier token from the WebAPI 2 site in my client to add it to a future request. Hope this is helpful to someone else.

Answer 2

Another way to do this:

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