从HttpWebRequest转换到HttpClient

Question

我正在使用Verizon ThingSpace api，在这里找到。

我正在尝试生成Oauth令牌。API文档提供了一个curl示例:

curl -X POST -d "grant_type=client_credentials" -H "Authorization: Basic BASE64_ENCODED_APP_KEY_AND_SECRET" -H "Content-Type: application/x-www-form-urlencoded" "/api/ts/v1/oauth2/token"

我已经能够在c#中使用旧的HTTPWebRequest成功复制curl命令，但是使用新的HttpClient失败了。

我得到的返回值是:

{"error":"invalid_request","error_description":"Invalid grant_type parameter or parameter missing"}

在API文档中使用c#中更新的HttpClient类复制curl示例的正确方法是什么?我已经检查了这个答案，但是它没有解决我使用grant_type时遇到的问题。 编辑:

这是HTTPWebRequest实现，它按预期工作:

public static void API_Login()
{
Console.WriteLine("API Request ----------------------------------");
string url = @https://thingspace.verizon.com/api/ts/v1/oauth2/token;
var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
httpWebRequest.Method = "POST";
httpWebRequest.ContentType = "application/x-www-form-urlencoded";
httpWebRequest.Headers.Add("Authorization", $"Basic {encodedKeyAndSecret}");
var body = "grant_type=client_credentials";
var data = Encoding.ASCII.GetBytes(body);
httpWebRequest.ContentLength = data.Length;

using (var stream = httpWebRequest.GetRequestStream())
{
stream.Write(data, 0, data.Length);
}

var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
var result = streamReader.ReadToEnd();
JsonObject jsonObject = (JsonObject)JsonObject.Parse(result);
apiToken = jsonObject["access_token"].ToString();
}
}

这里是HttpClient实现，这是不正常工作:

public async static void HttpClient_API_Login(string encodedKeyAndSecret)
{
string url = @https://thingspace.verizon.com/api/ts/v1/oauth2/token;
var client = new HttpClient();
var body = "grant_type=client_credentials";
var request = new HttpRequestMessage()
{
Method = HttpMethod.Post,
RequestUri = new Uri(url),
Headers =
{
{ HttpRequestHeader.ContentType.ToString(), $"application/x-www-form-urlencoded" },
{ HttpRequestHeader.Authorization.ToString(), $"Basic {encodedKeyAndSecret}" },
},
Content = new StringContent(body)
};

var response = client.SendAsync(request).Result;
var sr = await response.Content.ReadAsStringAsync();
Console.WriteLine("response: " + sr);
}

Answer 1

我已经通过更改代码解决了这个问题，如下所示:

public async static void HttpClient_API_Login(string encodedKeyAndSecret)

{

string url = @https://thingspace.verizon.com/api/ts/v1/oauth2/token;
var client = new HttpClient();

var formData = new List<KeyValuePair<string, string>>
{
new KeyValuePair<string, string>("grant_type", "client_credentials")
};
var request = new HttpRequestMessage()
{
Method = HttpMethod.Post,
RequestUri = new Uri(url),
Headers =
{
{ HttpRequestHeader.ContentType.ToString(), $"application/x-www-form-urlencoded" },
{ HttpRequestHeader.Authorization.ToString(), $"Basic {encodedKeyAndSecret}" },
},
Content = new FormUrlEncodedContent(body)
};

问题是正文是字符串内容，而不是表单内容。