如何在.Net控制台应用程序中获取承载令牌？

Question

I was following this tutorial about how to authorize and get a bearer token from a web-api server. The tasks performed there through fiddler are pretty simple, but, when I tried to do the same from a console application the request fails with a 400 Bad Request Error . Here is the code that makes the request to the server:

var request = WebRequest.Create("http://localhost:12698/token") as HttpWebRequest;
    request.Method = "POST";
    request.ContentType = "application/x-www-form-urlencoded";
    request.CookieContainer = new CookieContainer();         
    var authCredentials = "userName=" + user + "&password=" + password;
    byte[] bytes = System.Text.Encoding.UTF8.GetBytes(authCredentials);
    request.ContentLength = bytes.Length;
    using (var requestStream = request.GetRequestStream()){
        requestStream.Write(bytes, 0, bytes.Length);
    }

    using (var response = request.GetResponse() as HttpWebResponse){
        authCookie = response.Cookies["access_token"];
    }

can someone help me in determining what I am doing wrong here? or is there some other approach I should use to get the authentication token?

Answer 1

FormUrlEncodedContent is in System.Net.Http

        static string GetToken(string userName, string password)
        {
            var pairs = new List<KeyValuePair<string, string>>
                        {
                            new KeyValuePair<string, string>( "grant_type", "password" ), 
                            new KeyValuePair<string, string>( "userName", userName ), 
                            new KeyValuePair<string, string> ( "password", password )
                        };
            var content = new FormUrlEncodedContent(pairs);
            using (var client = new HttpClient())
            {
                var response = 
                    client.PostAsync("https://localhost:12698/Token", content).Result;
                return response.Content.ReadAsStringAsync().Result;
            }
        }

Answer 2

I'm not able to test this myself right now, but I think you've missed out some text in your authCredentials . It should look like this:

var authCredentials = "grant_type=password&userName=" + user + "&password=" + password;

Note the additional: grant_type=password& that I added at the beginning. This updated whole string authCredentials should be the only thing in your request body.

Assuming the request succeeds and it doesn't fail for other reasons, eg your username or password is not valid, then you should be able to get back your token data.

Also, the response will contain the access_token in a json-formatted string in its body, not in a cookie header where you're reading it from.